Nuclear safety level display control device based on optical fiber networking

Abstract

The application discloses a nuclear safety level display control device based on optical fiber networking, and relates to the field of digital control systems of nuclear power plants. The nuclear safety level display control device serves as a node of multiple independent optical fiber networks. Each optical fiber network comprises multiple safety level control stations and multiple nuclear safety level display control devices. The nuclear safety level display control device comprises a control module, a data processing module, a fault diagnosis module, a display touch module and multiple optical fiber communication modules. The control module is connected with the display touch module. The data processing module is connected with the control module and each optical fiber communication module. Each optical fiber communication module is connected with the data processing module and the optical fiber of one optical fiber network. The fault diagnosis module is connected with the control module, the data processing module and each optical fiber communication module. The nuclear safety level display control device transmits data through high-speed optical fiber networking technology, meets the safety level requirement, improves the data transmission rate, and avoids data delay reception and loss.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of digital control system of nuclear power plant, and particularly relates to a nuclear safety level display control device based on optical fiber networking. BACKGROUND

[0002] In the field of nuclear power, it is crucial to ensure the safety of the system. With the development of digital technology, the digital control system (DCS, Distributed Control System) of nuclear power plant has become the core tool for monitoring and operating the reactor and other critical facilities. In particular, the safety level display device plays an important role in providing important parameter information related to the reactor protection system, post-accident monitoring system, etc. These display devices not only need to show various safety-related parameter information to the operators, but also support the operators to send control instructions to the corresponding safety system through them. Therefore, the safety level display control device plays an indispensable role in improving the safety and operation efficiency of the nuclear power plant.

[0003] Currently, the safety level display control device of the nuclear power plant usually transmits data using a safety level dedicated field bus, such as Profibus PA / DP bus, Modbus Plus bus, etc. This safety level dedicated field bus communication has insufficient bandwidth and low transmission rate, which can easily cause problems such as data reception delay or even loss. SUMMARY

[0004] Therefore, the present application provides a nuclear safety level display control device based on optical fiber networking, which mainly aims to solve the problem of data reception delay or even loss in the current safety level display control device of the nuclear power plant.

[0005] According to one aspect of the present application, a nuclear safety level display control device based on optical fiber networking is provided, which serves as a node of multiple independent optical fiber networks, each optical fiber network including a plurality of safety level control stations and a plurality of nuclear safety level display control devices. The nuclear safety level display control device includes a control module, a data processing module, a fault diagnosis module, a display touch module, and a plurality of optical fiber communication modules, wherein,

[0006] The control module is connected to the display touch module and is configured to output a control instruction according to the interaction information received by the display touch module;

[0007] The data processing module is connected to the control module and each optical fiber communication module, respectively, and is configured to generate network transmission data and display data according to the control instruction, transmit the display data to the display touch module for display through the control module, and output an enable signal to each optical fiber communication module;

[0008] Each of the optical fiber communication modules is connected with the data processing module and an optical fiber of an optical fiber network, and is configured to convert network transmission data from an electrical signal into an optical signal and transmit the optical signal into the optical fiber network, and receive an optical signal transmitted on the optical fiber network and convert the optical signal into an electrical signal and transmit the electrical signal to the data processing module, so that the data processing module stores and processes the electrical signal data.

[0009] The fault diagnosis module is connected with the control module, the data processing module and each of the optical fiber communication modules, and is configured to output a first fault signal according to states of the control module and the data processing module, and send the first fault signal to each of the optical fiber communication modules, so that the optical fiber communication modules switch a transmission path of an optical signal in the optical fiber network according to the first fault signal and the enable signal.

[0010] Optionally, each of the optical fiber communication modules comprises a bypass control signal generation unit, an optical path switching unit and an optical-electrical conversion unit.

[0011] The bypass control signal generation unit is connected with the data processing module, the fault diagnosis module and the optical path switching unit, and is configured to output a second fault signal according to an enable signal output by the data processing module and a first fault signal output by the fault diagnosis module.

[0012] The optical path switching unit is connected with a previous node and a next node of the optical fiber network adjacent to the nuclear safety level display control device and the optical-electrical conversion unit, and is configured to connect the nuclear safety level display control device to the optical fiber network when the bypass control signal generation unit does not output the second fault signal, and connect the nuclear safety level display control device to the next node and the previous node of the optical fiber network respectively; and disconnect the nuclear safety level display control device from the optical fiber network and connect the previous node and the next node of the optical fiber network when the bypass control signal generation unit outputs the second fault signal.

[0013] The optical-electrical conversion unit is connected with the data processing module and the optical path switching unit, and is configured to convert an optical signal in the optical fiber network into an electrical signal and transmit the electrical signal to the data processing module, and convert network transmission data output by the data processing module from an electrical signal into an optical signal and transmit the optical signal into the optical fiber network.

[0014] Optionally, the optical path switching unit comprises a relay and an optical switch circuit, and the optical switch circuit comprises a first optical switch and a second optical switch.

[0015] The relay is connected with the bypass control signal generating unit, the first optical switch and the second optical switch respectively, and is used for controlling the working mode of the first optical switch and the second optical switch according to the second fault signal output by the bypass control signal generating unit.

[0016] The optical switch circuit is connected with the bypass control signal generating unit, the relay, the previous node and the next node in the fiber ring network and the photoelectric conversion unit respectively, and is used for connecting the nuclear safety level display control device with the next node and the previous node in the fiber network respectively when the working mode of the first optical switch and the second optical switch is the cross connection mode, and connecting the nuclear safety level display control device out of the fiber network and connecting the next node and the previous node in the fiber network when the working mode of the first optical switch and the second optical switch is the direct connection mode.

[0017] Optionally, the photoelectric conversion unit comprises a first photoelectric converter, a second photoelectric converter, a third photoelectric converter and a fourth photoelectric converter.

[0018] The first photoelectric converter is connected with the first optical switch and the data processing module, and is used for converting the optical signal transmitted by the previous node in the fiber network into an electrical signal and transmitting the electrical signal to the data processing module.

[0019] The second photoelectric converter is connected with the first optical switch and the data processing module, and is used for converting the network transmission data of the data processing module from an electrical signal into an optical signal and transmitting the optical signal to the next node in the fiber network.

[0020] The third photoelectric converter is connected with the second optical switch and the data processing module, and is used for converting the optical signal transmitted by the next node in the fiber network into an electrical signal and transmitting the electrical signal to the data processing module.

[0021] The fourth photoelectric converter is connected with the second optical switch and the data processing module, and is used for converting the network transmission data of the data processing module from an electrical signal into an optical signal and transmitting the optical signal to the previous node in the fiber network.

[0022] Optionally, the bypass control signal generating unit comprises a bypass key switch, a first optical relay, a second optical relay, a third optical relay and an inductor.

[0023] The first optical relay is connected with the data processing module, the inductor and the second optical relay, and is used for outputting the enable control signal of the data processing module.

[0024] The second optical relay is connected with the fault diagnosis module and the third optical relay, and is configured to output a fault enable signal according to the enable control signal and a first fault signal of the fault diagnosis module.

[0025] The third optical relay is connected with the bypass key switch, the relay, the first optical switch and the second optical switch, and is configured to output a second fault signal according to the fault enable signal and the bypass key switch.

[0026] Optionally, when the fault diagnosis module outputs the first fault signal, the data processing module outputs the enable signal, and the bypass key switch is connected, the working mode of the first optical switch and the second optical switch is a direct connection mode.

[0027] When the fault diagnosis module does not output the first fault signal, or the data processing module does not output the enable signal, or the bypass key switch is not connected, the working mode of the first optical switch and the second optical switch is a cross connection mode.

[0028] Optionally, the display touch module comprises an LVDS transceiver, a display touch integrated screen, an I 2 C expansion unit and an HDMI interface, wherein,

[0029] The LVDS transceiver is connected with the control module and the display touch integrated screen respectively, and is configured to convert display data of the control module from TTL / CMOS signals into LVDS differential signals and transmit the display data to the display touch integrated screen.

[0030] The HDMI interface is connected with the control module, and is configured to convert display data of the control module from TTL / CMOS signals into HDMI protocol signals.

[0031] The I 2 C expansion unit is connected with the control module and the display touch integrated screen respectively, and is configured to expand the I 2 C interface into multiple I 2 C interfaces to realize I

[0032] Optionally, each optical fiber network is a redundant ring network, and each optical fiber network comprises a plurality of reactor control stations, a plurality of safety facility trigger system control stations, a plurality of nuclear safety level display control devices, a plurality of transmission unit control stations and a gateway station, and the gateway station is further connected with a non-safety level network.

[0033] Optionally, the data processing module is an FPGA chip, and the FPGA chip is provided with a first data storage unit and a second data storage unit, wherein the first data storage unit is configured to store data to be transmitted by the nuclear safety level display control device to the fiber network, and the second data storage unit is configured to store data of other nodes on the fiber network.

[0034] Optionally, when the nodes of the fiber ring network include a non-safety level node, the non-safety level node is set as a node only receiving data.

[0035] By means of the technical scheme, the technical scheme provided by the embodiment of the present application has at least the following advantages:

[0036] The nuclear safety level display control device provided by the embodiment of the present application is a node of a plurality of independent fiber networks, receives data transmitted on different fiber networks, each fiber communication module receives optical signal data transmitted on the fiber network where the fiber communication module is located, converts the optical signal data into electrical signal data, transmits the electrical signal data to the data processing module, and the data processing module stores and processes the electrical signal data; the control module outputs a control instruction to the data processing module according to the interaction information received by the display touch module, the data processing module generates network transmission data according to the control instruction, the fiber communication module converts the network transmission data from electrical signal into optical signal and transmits the network transmission data to the fiber network, the data processing module processes data according to the control instruction to generate display data, and outputs the display data to the control module, the control module transmits the display data to the display touch module for display, the nuclear safety level display control device transmits data by means of high-speed fiber networking technology, realizes optical-electric isolation of data, meets the safety level requirement, improves the data transmission rate, and avoids data delay reception and loss.

[0037] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0038] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered as limiting the present application. Moreover, the same reference symbols are used to represent the same components throughout the drawings. In the drawings:

[0039] Figure 1 The structure block diagram of the nuclear safety level display control device based on fiber networking provided by the embodiment of the present application is shown;

[0040] Figure 2 Fig. 6 shows a plurality of fiber network connection diagrams of another nuclear safety class display control device based on fiber networking provided by embodiments of the present application;

[0041] Figure 3 Fig. 7 shows a structure diagram of an optical path switching unit of another nuclear safety class display control device based on fiber networking provided by embodiments of the present application;

[0042] Figure 4 Fig. 8 shows another structure diagram of another nuclear safety class display control device based on fiber networking provided by embodiments of the present application;

[0043] Figure 5 Fig. 9 shows a partial structure diagram of an optical-electricity conversion unit of another nuclear safety class display control device based on fiber networking provided by embodiments of the present application;

[0044] Figure 6 Fig. 10 shows a partial structure diagram of an optical-electricity conversion unit of another nuclear safety class display control device based on fiber networking provided by embodiments of the present application;

[0045] Figure 7 Fig. 11 shows a structure diagram of a bypass control signal generation unit of another nuclear safety class display control device based on fiber networking provided by embodiments of the present application;

[0046] Figure 8 Fig. 12 shows a partial structure diagram of a display touch module of another nuclear safety class display control device based on fiber networking provided by embodiments of the present application;

[0047] Figure 9 Fig. 13 shows a partial structure diagram of a display touch module of another nuclear safety class display control device based on fiber networking provided by embodiments of the present application;

[0048] Figures 1-9 Fig. 14 shows a structure diagram of another nuclear safety class display control device based on fiber networking provided by embodiments of the present application; 12-control module; 14-data processing module; 16-fault diagnosis module; 18-fiber communication module; 20-display touch module; 181-relay; 182-first optical switch; 183-second optical switch; KT2-first optical relay; KT3-first optical relay; KT4-first optical relay; GUZ-signal output end of bypass control signal generation unit; L31-inductor; KEY-bypass key switch; 201-LVDS transceiver; 202-display touch integrated screen; 203-I 2 C expansion unit; 204-HDMI interface. DETAILED DESCRIPTION

[0049] Hereinafter, the present application will be described in detail with reference to the accompanying drawings and embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0050] In order to further clarify the technical means and effects adopted by the present application to achieve the predetermined object, the specific implementation, structure, features and effects according to the present application are described in detail below in combination with the drawings and preferred embodiments. In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0051] In view of the problem of receiving data delay or even loss of the current safety level display control device of nuclear power plant, the embodiment of the present application provides a nuclear safety level display control device based on optical fiber networking. The nuclear safety level display control device is a node of multiple independent optical fiber networks. Each optical fiber network includes multiple safety level control stations and multiple nuclear safety level display control devices. As shown in Figure 1 The nuclear safety level display control device includes a control module 12, a data processing module 14, a fault diagnosis module 16, a display touch module 20 and multiple optical fiber communication modules 18. The control module 12 is connected with the display touch module 20, and is used to output a control instruction according to the interaction information received by the display touch module 20. The data processing module 14 is connected with the control module 12 and each optical fiber communication module 18 respectively, and is used to generate network transmission data and display data according to the control instruction, transmit the display data to the display touch module 20 for display through the control module 12, and output an enable signal to each optical fiber communication module 18. Each optical fiber communication module 18 is connected with the data processing module 14 and the optical fiber of one optical fiber network, and is used to convert the network transmission data from an electrical signal into an optical signal and transmit it to the optical fiber network, receive the optical signal transmitted on the optical fiber network, and convert the optical signal into an electrical signal and transmit it to the data processing module, so that the data processing module 14 stores and processes the electrical signal data. The fault diagnosis module 16 is connected with the control module 12, the data processing module 14 and each optical fiber communication module 18 respectively, and is used to output a first fault signal according to the state of the control module 12 and the data processing module 14, and send the first fault signal to each optical fiber communication module 18, so that the optical fiber communication module 18 switches the transmission path of the optical signal in the optical fiber network according to the first fault signal and the enable signal.

[0052] Specifically, the high-speed optical fiber networking communication technology is to send the storage data of each "station" (hereinafter referred to as node) of the nuclear power plant control system to all nodes on the optical fiber network through the multi-node optical fiber network, until the data returns to the initial node and is removed from the network. The local storage area of each node on the network can store process parameters and diagnostic information of all nodes. This communication mode continuously refreshes the local storage area of all nodes on the optical fiber network in a fixed period, thereby realizing data communication between the stations of the safety level control system.

[0053] The nuclear safety level display control device is called a local display control all-in-one machine when it is set locally, and is called a remote display control all-in-one machine when it is set remotely. The nuclear safety level DCS connects multiple stations together based on optical fiber networking to form a multi-node communication optical fiber reflection network system. The nuclear safety level display control device is a node in the optical fiber network, and the topology architecture diagram of the optical fiber network is as shown in Figure 2 The remote display control all-in-one machine has multiple optical fiber communication modules, and through one optical fiber communication module, a safety level control station, a gateway station, an on-site display control all-in-one machine, and other remote display control all-in-one machines form a redundant optical fiber double ring network for real-time data sharing. Through another optical fiber communication module, other safety level control stations, preferred stations, etc. form another redundant optical fiber double ring network. The nuclear safety level display control device needs to be connected to how many optical fiber networks to set how many optical fiber communication modules. The nodes in the optical fiber network can be configured and downloaded through the configuration optical fiber interface of the engineer station. The optical fiber networking communication can set multiple baud rates for data sending and receiving, and the typical optical fiber rate can be set as: 1.25Gbps, 2Gbps, 2.125Gbps, 2.5Gbps, 3.25Gbps, etc.

[0054] The nuclear safety level display control device is based on the architecture of a data processing module + a fault diagnosis module + a control module, and is connected in the multi-node reflection network system of the nuclear safety level DCS through the high-speed optical fiber networking communication technology. The display touch module is a kind of display control human-computer interaction interface, which displays the software graphical interface, data, curve historical data and configuration interface of the nuclear safety level DCS platform through the display touch module, and can also send control instructions through the graphical interface of the display touch module. The nuclear safety level display control device communicates with other control stations through the optical fiber communication module to obtain inter-station data state information; and connects with the engineer station through the optical fiber communication module to obtain the graphical configuration data and ring network configuration information downloaded by the engineer station configuration.

[0055] Each optical fiber communication module is connected with an optical fiber network, and the nuclear safety level display control device needs to access how many optical fiber networks to set how many optical fiber communication modules. The optical fiber communication module converts the optical signal on the optical fiber network into an electrical signal and transmits it to the data processing module. The data processing module stores the received data and processes its own data according to the instructions sent by the control module to generate network transmission data to be sent. The network transmission data to be sent is transmitted to the optical fiber network through the optical fiber communication module. At the same time, the received network data is processed according to the instructions of the control module, for example, the data of a certain nuclear reactor is calculated to obtain data that can reflect the characteristics of the nuclear reactor, and then the data is sent to the control module. The display touch module receives the interaction data and transmits the interaction data to the control module. The control module generates control instructions according to the interaction data and sends the control instructions to the data processing module. The data processing module processes the data of the node or processes the data of other nodes according to the control instructions, and sends the processed display data to the control module. The control module sends the display data to the display touch module for display. The data in the nuclear power high-speed network system can be obtained and diagnosed online in real time, and software graphical interface, data, curve historical data and configuration interface can be displayed. At the same time, the operator can issue control instructions to the relevant safety system through the display control device. The data processing module processes the data of the node according to the control instructions to generate network transmission data to be sent, and the optical fiber communication module converts the network transmission data from an electrical signal to an optical signal and transmits it to the optical fiber network.

[0056] The fault diagnosis module monitors the state of the control module and the data processing module, determines whether a fault has occurred according to the monitoring data, and outputs a first fault signal to the optical fiber communication module when a fault occurs. After receiving the first fault signal, the optical fiber communication module excludes the nuclear safety level display control device from the optical fiber network, and changes the transmission path of the optical signal in the optical fiber network.

[0057] The nuclear safety level display control device further comprises a JTAG (Joint Test Action Group) interface circuit, a serial printer interface circuit, an LCD (Liquid Crystal Display) screen display signal interface circuit, an LCD screen touch signal interface circuit, a key indication interface circuit, an Ethernet PHY chip (Physical Layer Device) interface circuit, a maintenance interface circuit, a gate interface circuit, an EMMC (Embedded Multi-Media Card) storage chip, an SDRAM (Synchronous Dynamic Random-Access Memory) storage chip, a FLASH (FLASH EEPROM, FLASH EEPROM) storage chip, and a station address circuit of a protection system.

[0058] The fault tolerance and self-recovery depend on the fault self-diagnosis of the device. The self-diagnosis function is a very important function of the safety level platform. In normal operation, the safety level platform monitors the hardware and software devices in real time through the self-diagnosis function. After a fault occurs, the self-diagnosis function detects the fault and triggers the processing and alarm mechanism to avoid fault propagation and ensure that the safety function of the platform is not lost in the fault state. Therefore, the nuclear safety level display control device is provided with a fault diagnosis module, which obtains the running state of the data processing module and the control module in real time. The self-diagnosis range covers signal acquisition self-diagnosis, signal processing self-diagnosis, data communication self-diagnosis, and signal output self-diagnosis, channel dynamic self-diagnosis, and output self-diagnosis. Once a fault is detected, a first fault signal is output as the basis for subsequent fault processing and alarm indication. For fault modes within the responsibility range of the fault diagnosis module, the diagnosis measures detect the fault and design corresponding fault processing mechanisms, mainly including redundancy switching and fault safety processing mechanisms. The specific mechanism determines whether to bypass the network node according to the fault severity level.

[0059] The nuclear safety level display control device of the present application has a safety ring network redundancy communication self-recovery technology, realizes link fault immunity and node fault immunity, overcomes the fatal weakness of traditional networks in harsh industrial environments, i.e., "one fault causes the whole network to be paralyzed", supports 64 network nodes, and the memory data reflection time to all network nodes is <3ms; and provides high-reliability communication guarantee for the safety protection system of nuclear facilities.

[0060] The display control device in the multi-node reflective ring network is a safety level device, and the configuration tool of the engineer station is optoelectronically isolated, specifically, the high-speed optical fiber interface in the optical fiber communication module is connected with the configuration tool of the engineer station, so that the display control panel of the display control device is configured according to the requirement, and other nodes in the multi-node reflective network can share the configuration data through the real-time variables configured by the display control panel. In addition to the configuration of the type, name, hardware version, firmware version and configuration data version of the device, the network number of the communication node, the network node number and the communication cycle of the whole network, and the sending variable information and the receiving variable mapping of the node also need to be configured. In order to realize the communication fault detection function, the communication node also needs to know the configuration information of other nodes. According to the content or security level of the transmission data, the devices can be divided into multiple different ring networks, the network number can be configured arbitrarily, and the configuration range is 1-255. The node number of the communication node in the network can be configured arbitrarily, and the configuration range is 1-64. Network node sending cycle configuration: the time range of configuration is 15ms-100ms, and the configurable time step is 5ms. Node sending data length configuration: the engineer station tool automatically counts the sending variable data length sent through the multi-node communication module when performing variable configuration or compilation, and the multi-node communication module frames and sends data according to the sending data length information. The engineer station tool checks whether the sending data length of a single node exceeds 12Kbyte, and whether the whole network data exceeds 128Kbyte, and gives an alarm if the range is exceeded.

[0061] The touch control implementation process of the display touch module includes GUI (Graphical User Interface, graphical user interface) event request, touch information acquisition, ordinary click, two-point touch, GUI pointer event, GUI processing event, and action execution. The capacitive touch screen and the MCU (Microcontroller Unit, microcontroller) interface are designed as I 2 C (Inter-IntegratedCircuit, internal integrated circuit bus) interface, which feeds back the touch control information to the master control chip. The GUI event request realizes two-point touch recognition, and generally needs to acquire information including touch information finger ID (Identification, identity), touch information distance increment, touch information center point, and touch information angle. The implementation method is divided into three levels: the driver layer, the adaptation layer, and the application layer. The driver layer acquires information through the hardware interface, the adaptation layer combines the touch control information with the GUI technology, processes the touch control information as a message event of the GUI layer, the application layer determines the window information through the message, obtains the corresponding window control, responds to the touch message, and executes the action.

[0062] The application provides a nuclear safety level display control device based on optical fiber networking, compared with the prior art, the nuclear safety level display control device is a node of multiple independent optical fiber networks, receives data transmitted on different optical fiber networks, each optical fiber communication module receives optical signal data transmitted on the optical fiber network where the optical fiber communication module is located, converts the optical signal data into electrical signal data, transmits the electrical signal data to a data processing module, the data processing module stores and processes the electrical signal data, a control module outputs a control instruction to the data processing module according to interactive information received by a display touch module, the data processing module generates network transmission data according to the control instruction, an optical fiber communication module converts the network transmission data from electrical signal into optical signal and transmits the optical signal to the optical fiber network, the data processing module processes data according to the control instruction to generate display data, and outputs the display data to the control module, the control module transmits the display data to the display touch module for display, the nuclear safety level display control device transmits data through high-speed optical fiber networking technology, realizes optical-electric isolation of data, meets the safety level requirement, improves the data transmission rate, and avoids data delay reception and loss.

[0063] In one embodiment of the application, each optical fiber communication module comprises a bypass control signal generation unit, an optical path switching unit and an optical-electric conversion unit,

[0064] The bypass control signal generation unit is connected with the data processing module, the fault diagnosis module and the optical path switching unit respectively, and is used for outputting a second fault signal according to an enable signal output by the data processing module and a first fault signal output by the fault diagnosis module;

[0065] The optical path switching unit is connected with the last node and the next node adjacent to the nuclear safety level display control device in the optical fiber network and the optical-electric conversion unit respectively, and is used for connecting the nuclear safety level display control device to the optical fiber network and connecting the nuclear safety level display control device with the next node and the last node in the optical fiber network when the bypass control signal generation unit does not output the second fault signal, and connecting the last node and the next node in the optical fiber network when the bypass control signal generation unit outputs the second fault signal;

[0066] The optical-electric conversion unit is connected with the data processing module and the optical path switching unit respectively, and is used for converting optical signal in the optical fiber network into electrical signal and transmitting the electrical signal to the data processing module, and converting network transmission data output by the data processing module from electrical signal into optical signal and transmitting the optical signal to the optical fiber network.

[0067] Specifically, the input end of the bypass control signal generation unit is electrically connected with the enable signal output end of the data processing module, the first fault signal output end of the fault diagnosis module and the bypass key switch respectively, and the output end of the bypass control signal generation unit is electrically connected with the control signal input end of the optical path switching unit. When the bypass control signal generation unit outputs the second fault signal, the optical path switching unit disconnects the optical-electric conversion module of the nuclear safety level display control device from the optical path switching unit according to the second fault signal, that is, disconnects the nuclear safety level display control device from the optical fiber network, so that the last node and the next node adjacent to the nuclear safety level display control device in the optical fiber network are directly connected. When the bypass control signal generation unit does not output the second fault signal, the optical-electric conversion module of the nuclear safety level display control device is connected with the optical path switching unit, that is, the nuclear safety level display control device is connected with the optical fiber network, so that the optical fiber data of the last node in the optical fiber network is transmitted to the nuclear safety level display control device, and the nuclear safety level display control device transmits the data to the next node. Correspondingly, for the reverse transmission, the optical fiber data of the next node in the optical fiber network is transmitted to the nuclear safety level display control device, and the nuclear safety level display control device transmits the data to the last node.

[0068] In one embodiment of the present application, as shown in Figure 3 The optical path switching unit includes a relay 181 and an optical switch circuit, and the optical switch circuit includes a first optical switch 182 and a second optical switch 183.

[0069] The relay 181 is connected with the bypass control signal generation unit, the first optical switch 182 and the second optical switch 183 respectively, and is used to control the working mode of the first optical switch 182 and the second optical switch 183 according to the second fault signal output by the bypass control signal generation unit.

[0070] The optical switch circuit is connected with the bypass control signal generation unit, the relay 181, the last node and the next node in the optical fiber ring network and the optical-electric conversion module respectively, and is used to connect the nuclear safety level display control device into the optical fiber network when the working mode of the first optical switch 182 and the second optical switch 183 is the cross connection mode, and connect the nuclear safety level display control device with the next node and the last node in the optical fiber network respectively; and when the working mode of the first optical switch 182 and the second optical switch 183 is the direct connection mode, the nuclear safety level display control device is excluded from the optical fiber network, and the next node and the last node in the optical fiber network are connected.

[0071] Specifically, the first end of the coil of the relay is electrically connected with the bypass control signal output end of the bypass control signal generating unit, the second end of the coil of the relay is electrically connected with the negative pole of the power supply, the first end of the common contact of the relay is electrically connected with the first input end of the first optical switch, the first input end of the second optical switch and the positive pole of the power supply respectively, the second end of the common contact of the relay is electrically connected with the second input end of the first optical switch, the second input end of the second optical switch and the positive pole of the power supply respectively, the first end of the normally closed contact of the relay is electrically connected with the first output end of the first optical switch, the first output end of the second optical switch, the second end of the normally closed contact of the relay is electrically connected with the second output end of the first optical switch, the second output end of the second optical switch, the first end of the normally open contact of the relay is electrically connected with the third output end of the first optical switch, the third output end of the second optical switch, and the second end of the normally open contact of the relay is electrically connected with the fourth output end of the first optical switch, the fourth output end of the second optical switch.

[0072] The positive pole end of the first optical switch is electrically connected with the signal output end of the bypass control signal generating unit, and the negative pole end of the first optical switch is electrically connected with the negative pole end of the power supply; the second optical signal port of the first optical switch is connected with the optical module of the previous node in the fiber ring network, the fourth optical signal port of the first optical switch is connected with the first optical signal input end of the photoelectric conversion unit, the first optical signal port of the first optical switch is connected with the first optical signal output end of the photoelectric conversion unit, and the third optical signal port of the first optical switch is connected with the optical module of the next node in the fiber ring network;

[0073] The positive pole end of the second optical switch is electrically connected with the signal output end of the bypass control signal generating unit, and the negative pole end of the second optical switch is electrically connected with the negative pole end of the power supply; the third optical signal port of the second optical switch is connected with the optical module of the next node in the fiber ring network, the first optical signal port of the second optical switch is connected with the second optical signal input end of the photoelectric conversion unit, the fourth optical signal port of the second optical switch is connected with the second optical signal output end of the photoelectric conversion unit, and the second optical signal port of the second optical switch is connected with the optical module of the previous node in the fiber ring network.

[0074] As Figure 3As shown, in order to ensure the synchronization of the two optical switch states, the control logic of the two optical switches is completed by the same relay. The positive electrode end PIN10 pin of the power supply of the optical switch is electrically connected with the signal output end GUZ of the bypass control signal generation unit. When the bypass control signal generation unit outputs a high level signal, the coil of the relay is powered, the normally open contact of the relay is closed, the normally closed contact is opened, the 5V power supply between the PIN10 pin of the optical switch and the negative electrode end PIN1 pin is normal, the first input end PIN3 pin and the first output end PIN2 pin, the second input end PIN8 pin and the second output end PIN9 pin of the optical switch are all disconnected, the first input end PIN3 pin and the third output end PIN4 pin, the second input end PIN8 pin and the fourth input end PIN7 pin are all closed, and the optical switch is in bypass mode (at this time, the Port2 port and the Port3 port of the optical switch are in a connected state, the Port1 port and the Port4 port are in a connected state, for the forward transmission signal, the optical signal of the previous node is transmitted to the next node through the port2 port and the port3 port of the first optical switch, and for the reverse transmission signal, the optical signal of the next node is transmitted to the previous node through the port2 port and the port3 port of the second optical switch), that is, when the first fault signal is output by the fault diagnosis module, the enable signal is output by the data processing module, and the bypass key switch is connected, the working mode of the bypass first optical switch and the second optical switch is direct connection mode.

[0075] When the fault diagnosis module does not output the first fault signal or the data processing module does not output the enable signal or the bypass key switch is not connected, the bypass control signal generating unit outputs a low-level signal, the coil of the relay is not powered, the normally open contact of the relay is disconnected, the normally closed contact is closed, there is no 5V power supply between the PIN10 pin and the power negative terminal PIN1 pin of the optical switch, the PIN3 pin and the PIN2 pin, the PIN8 pin and the PIN9 pin of the optical switch are both closed, the PIN3 pin and the PIN4 pin, the PIN8 pin and the PIN7 pin are both disconnected, and the optical switch is in a cross-connection working mode (at this time, the Port1 port and the Port3 port of the optical switch are in a connected state, the Port2 port and the Port4 port are in a connected state, for a forward transmission signal, the optical signal of the previous node is transmitted to the optoelectronic conversion unit through the port2 port and the port4 port of the second optical switch, the optoelectronic conversion unit converts the optical signal into an electrical signal and transmits it to the data processing module, the data processing module transmits the data to be sent to the optoelectronic conversion unit, and the optoelectronic conversion unit converts the electrical signal into an optical signal and transmits it to the port4 port and the port2 port of the first optical switch and then to the next node, for a reverse transmission signal, the optical signal of the next node is transmitted to the optoelectronic conversion unit through the port3 port and the port1 port of the second optical switch, the optoelectronic conversion unit converts the optical signal into an electrical signal and transmits it to the data processing module, the data processing module transmits the data to be sent to the optoelectronic conversion unit, and the optoelectronic conversion unit converts the electrical signal into an optical signal and transmits it to the port1 port and the port3 port of the first optical switch and then to the previous node), that is, when the fault diagnosis module does not output the first fault signal or the data processing module does not output the enable signal or the bypass key switch is not connected, the working mode of the first optical switch and the second optical switch is a cross-connection mode.

[0076] In an embodiment of the present application, the optoelectronic conversion unit comprises a first optoelectronic converter, a second optoelectronic converter, a third optoelectronic converter and a fourth optoelectronic converter, wherein,

[0077] The first optoelectronic converter is connected with the first optical switch and the data processing module, and is used for converting the optical signal transmitted by the previous node in the optical fiber network into an electrical signal and transmitting it to the data processing module;

[0078] The second optoelectronic converter is connected with the first optical switch and the data processing module, and is used for converting the network transmission data of the data processing module from an electrical signal into an optical signal and transmitting it to the next node in the optical fiber network;

[0079] The third optoelectronic converter is connected with the second optical switch and the data processing module, and is used for converting the optical signal transmitted by the adjacent next node in the optical fiber network into an electrical signal and transmitting it to the data processing module;

[0080] A fourth photoelectric converter is connected with the second optical switch and the data processing module, and is used for converting network transmission data of the data processing module from an electrical signal into an optical signal and transmitting the optical signal to a previous node in an optical fiber network.

[0081] Specifically, an optical signal port of the first photoelectric converter is connected with a fourth optical signal port of the first optical switch, an electrical signal output end of the first photoelectric converter is electrically connected with a first network data input end of the data processing module, a first network data output end of the data processing module is electrically connected with an electrical signal input end of the second photoelectric converter, and an optical signal port of the second photoelectric converter is connected with a first optical signal of the second optical switch.

[0082] An optical signal port of the third photoelectric converter is connected with a first optical signal port of the first optical switch, an electrical signal output end of the third photoelectric converter is electrically connected with a second network data input end of the data processing module, a second network data output end of the data processing module is electrically connected with an electrical signal input end of the fourth photoelectric converter, and an optical signal port of the fourth photoelectric converter is connected with a fourth optical signal of the second optical switch.

[0083] Specifically, the data processing module is an FPGA chip, the diagnosis processing module is an FPGA chip, and 8 groups of differential pairs of high-speed SERDES interfaces (SERializer+DESerializer, serializer / deserializer interface) of 4 GTX (Gigabit Transceiver X) of the FPGA for data processing are respectively connected with 8 groups of differential pairs of receiving ends and transmitting ends of the four photoelectric converters. Figure 4 and Figure 5The FPGA technology-based GTX high-speed SERDES signal interface + SFP (Small Form-factor Pluggable, optical-electric conversion unit) architecture mode is adopted for fiber networking, which is different from the traditional controller + Ethernet PHY chip (Physical Layer Device, physical layer chip) + fiber transceiver. The advantage is that the FPGA technology-based GTX high-speed SERDES signal belongs to programmable gate array technology, the two groups of SERDES signal receiving and transmitting differential signal pins of the FPGA chip GTX high-speed interface and the logic are independent of each other, and the optical fiber interfaces of the SFP optical-electric conversion unit are controlled respectively, the optical-electric conversion unit is connected with two optical fibers, and is used for receiving and transmitting optical signals respectively, the two groups of receiving and transmitting differential electrical signal pins of the FPGA chip GTX interface are independent of each other in the FPGA internal and logic processing mechanism, so that the receiving and transmitting interfaces of the two optical fibers of each SFP optical-electric conversion unit are independent of each other, any one of the optical fibers of the interface can be pulled out, and the other optical fiber of the interface can still normally communicate, and the internal and external double-loop network redundancy of the fiber network is truly independent, so that any link interruption in the network does not affect the communication of another link. The traditional MCU chip does not have this function.

[0084] The connection diagram of the two pairs of differential pairs of the SERDES interface is as shown in Figure 6 The two pairs of differential pins TD+ (transmit positive), TD- (transmit negative), RD+ (receive positive) and RD- (receive negative) of the optical-electric conversion unit SFP. The power supply pins of the optical-electric conversion unit SFP are connected with DC VCC and digital ground DGND, and the three self-defined signal lines MOD-DEF [0-2] of the optical-electric conversion unit SFP are connected with three pull-up resistors to the power supply VCC. The optical-electric conversion circuit of the maintenance interface in the nuclear safety level display control device also adopts this scheme, and the maintenance interface adopts the SERDES high-speed interface of the Ethernet PHY chip.

[0085] In one embodiment of the present application, the bypass control signal generation unit includes a bypass key switch, a first optical relay, a second optical relay, a third optical relay and an inductor, wherein,

[0086] The first optical relay is connected with the data processing module, the inductor and the second optical relay, and is used for outputting the enable control signal of the data processing module;

[0087] The second optical relay is connected with the fault diagnosis module and the third optical relay, and is used for outputting the fault enable signal according to the enable control signal and the first fault signal of the fault diagnosis module;

[0088] The third optical relay is connected to the bypass key switch, the relay, the first optical switch, and the second optical switch, and is used to output a second fault signal based on the fault enable signal and the bypass key switch.

[0089] Specifically, the bypass control signal generation unit consists of three opto-relays with opto-physical isolation. Each opto-relay is controlled simultaneously by the data processing module, the fault diagnosis module, and the bypass key switch. Only when all three are enabled can the node of the nuclear safety-grade display and control device in the multi-node reflection ring network function normally participate in network communication. Otherwise, if one of the data processing module or the fault diagnosis module has an abnormal signal or the bypass key switch is switched to bypass mode, the fiber optic bypass matrix will be forced to switch to bypass mode. That is, when the node of the display and control device in the multi-node high-speed fiber optic reflection ring network is bypassed, it is abnormally removed and does not participate in the communication of the multi-node reflection network. Only when the abnormal signals of the data processing module and the fault diagnosis module are cleared and the bypass key switch returns to normal can the node of the display and control device in the multi-node reflection ring network participate in network communication again.

[0090] like Figure 7 As shown, pin 1 of the first photorelay KT2 is connected to a pull-up resistor to the power supply VCC; pin 2 of KT2 is connected to the enable signal output terminal of the data processing module 14; pin 4 of the first photorelay KT2 is connected to one end of the inductor L31, and the other end of the inductor L31 is connected to the power supply +5VDC; pin 3 of the first photorelay KT2 is connected in series with pin 4 of the second photorelay KT3; pin 1 of the second photorelay KT3 is connected to a pull-up resistor to the power supply VDD; pin 2 of the second photorelay KT3 is connected to the first fault signal output terminal of the fault diagnosis module; pin 3 of the second photorelay KT3 is connected in series with pin 4 of the third photorelay KT4; pin 1 of the third photorelay KT4 is connected to a pull-up resistor to the power supply +24VDC; pin 2 of KT4 is connected to the mode signal of the bypass key switch KEY; simultaneously, pin 2 of the third photorelay KT4 is connected to a diode and a capacitor, the other ends of which are both connected to the +24V power supply ground 24V_GND; the control signal output from pin 3 of the third photorelay KT4 is connected to... Figure 3 The relay coil shown has its first terminal GUZ connected to the positive power supply terminal of the first optical switch and the positive power supply terminal GUZ of the second off switch, thus completing the optical path management and switching functions.

[0091] In one embodiment, such as Figure 8 As shown, the display touch module 20 includes an LVDS transceiver 201, a display touch screen 202, and an I / O panel. 2 The C expansion unit 203 and the HDMI interface 204, among which...

[0092] The LVDS transceiver 201 is connected to the control module 12 and the display touch screen 202 respectively, and is used to convert the display data of the control module 12 from TTL / CMOS signal to LVDS differential signal and transmit it to the display touch screen 202.

[0093] The HDMI interface 204 is connected to the control module 12 and is used to convert the display data of the control module 12 from TTL / CMOS signals to HDMI protocol signals.

[0094] I 2 The C expansion unit 203 is connected to the control module 12 and the integrated touch screen, respectively, and is used to connect the I... 2 The C interface is expanded to multiple interfaces, allowing the control module to communicate with the touch signal interface and button indicator interface of the integrated touch screen respectively. 2 C communication.

[0095] Specifically, such as Figure 8 As shown, the 24 IO (Input / Output Pins) of the control module are connected to the three sets of single-ended signal pins corresponding to the LVDS (Low-Voltage Differential Signaling) transceiver. The clock signal, enable signal, and synchronization signal of the LVDS transceiver are connected to the corresponding interfaces of the control module. The five pairs of differential LVDS signals of the LVDS transceiver are connected to the corresponding pins of the LVDS differential interface of the LCD touch screen. Simultaneously, the signals connected to the control module and the LVDS transceiver are all connected to the HDMI (High-Definition Multimedia Interface) high-speed interface, which is used to expand the display screen interface.

[0096] LCD touch and button signal interface circuits, such as Figure 9 As shown, the control module I 2 The clock signal, serial data signal, interrupt request signal, and reset signal of the C interface are respectively connected to I... 2 C extension unit, I 2 The C expansion unit will have one I 2 The C interface is expanded to include multiple I... 2 C interface, where I 2 The four signal lines of the C1 interface connect to the LCD screen touch signal connector of the integrated touch screen display. 2 The four signal lines of the C2 interface connect to the connector for the button signals of the touchscreen display. The control module connects via I... 2 The C interface obtains touch screen and button information from the integrated touch screen display.

[0097] The TTL (Transistor-Transistor Logic) level output by the serial port UART2 (Universal Asynchronous Receiver / Transmitter) of the control module is connected to an optoelectronic isolation chip, the optoelectronic isolation chip connects the isolated TTL level to an RS232 (Recommended Standard 232) transceiver, the RS232 transceiver connects the converted RS232 level to an external printer device for data interaction and printing function, and the printer and the control module are optoelectronic isolated. Similarly, the TTL level output by the serial port UART0 of the control module is connected to an isolation chip, the isolation chip connects the isolated TTL level to an RS232 transceiver, and the RS232 transceiver connects the converted RS232 level to a debugging interface of a display touch screen to realize device debugging function.

[0098] In one embodiment, each optical fiber network is a redundant ring network, and each optical fiber network includes a plurality of reactor control stations, a plurality of safety facility trigger system control stations, a plurality of nuclear safety level display and control devices, a plurality of transmission unit control stations, and a gateway station, and the gateway station is also connected to a non-safety level network.

[0099] Specifically, the high-speed optical fiber network adopts a positive and negative ring redundant network topology structure. Since the communication nodes broadcast the message data to two directions at the same time according to a period, other nodes on the network will receive two identical message data, thereby realizing data redundancy. Since the transmission paths of the two message data are different, the time of arrival at a node may also be different. The processing principle of redundant data in the high-speed optical fiber network is that if a node first receives a data frame in a certain direction and passes the communication detection (except for message integrity check), the application data of the data frame is used, and the data frame in the other direction is not processed regardless of whether it arrives or not; if neither of the two data frames passes the detection, it is determined that there is a communication error.

[0100] As Figure 2As shown, the reactor protection cabinet device is applied to different types of nuclear reactor protection systems of a nuclear power plant. The safety level network A1 and B1 each includes a plurality of reactor protection cabinets (RPC), a plurality of emergency secondary feedwater actuation controller stations (ESFA), a plurality of nuclear safety level display control devices (the reactor protection cabinet device in the figure), a plurality of terminal unit control stations (TU) and gateway stations. An optical fiber network transmits state data and indication signals (such as field transmitter / sensor signals), alarm signals and control station health status information generated by the reactor protection cabinets and the emergency secondary feedwater actuation controller stations to other nodes. The TU control station also serves as a node of the safety level network A2, and the TU control station transmits the collected information of the above nodes to nodes on the safety level network A2. The gateway stations on the safety level network A2 are connected to a non-safety level network, and the information of the above nodes is transmitted to the non-safety level network through the gateway stations.

[0101] In one embodiment, the data processing module is an FPGA chip, and the FPGA chip is provided with a first data storage unit and a second data storage unit. The first data storage unit is used to store data to be transmitted by the nuclear safety level display control device to the optical fiber network, and the second data storage unit is used to store received data of other nodes on the optical fiber network.

[0102] Specifically, the data processing module is an FPGA chip, and the FPGA chip is provided with a first data storage unit and a second data storage unit. The nuclear power plant reactor safety level side system and the non-safety level side system realize communication isolation by using a dual-port RAM storage based on FPGA technology. The transmission data of the node is directly mapped to the first data storage unit, i.e., the node data area; the received data is stored in the second data storage unit, and the forwarded data is selected from the other node data area through a pre-configured received data mapping table and stored in the dual-port storage unit for communication processing. The high-speed optical fiber multi-node reflective network is a state-based communication network, and the number of network nodes and the transmitted data set are determined in the network configuration stage and will not be dynamically adjusted during operation. That is, the number, arrangement and total length of the transmitted variables of the node are determined. Moreover, the total number of nodes of the high-speed optical fiber multi-node reflective network is also determined in the network configuration stage.

[0103] The network load rate is maximum when the total network data amount is maximum and the node sending period is shortest on the high-speed optical fiber multi-node reflection network. It is known that the communication rate (bandwidth) on a single ring is 1000 Mbps, and the data frame length is 1060 bytes, of which the effective data is 1024 bytes. Therefore, the maximum value of all data per period on the network is (128*1060) bytes. Then, the maximum network load rate is calculated as follows:

[0104]

[0105] The system requirement that the network load rate is less than 15% is met.

[0106] The high-speed optical fiber multi-node reflection network adopts a "data producer-consumer" communication mode based on broadcasting. The data producer refers to a party that generates data, and the data consumer refers to a party that uses data. The two correspond to the sending party and the receiving party of data in the high-speed optical fiber multi-node reflection network, respectively. Only the nodes configured with a sending variable in the high-speed optical fiber multi-node reflection network serve as data producers and broadcast data to other nodes. All communication nodes receive the data of the data producer. The requirement that the maximum number of network nodes of the high-speed optical fiber multi-node reflection network is 64 is met. The data producer and the consumer do not need to interact or perform handshake, which reduces the sending delay that accounts for the largest proportion of communication delay and provides real-time performance of the network.

[0107] In the high-speed optical fiber multi-node reflection network communication, each data frame can carry a message data of 1 kByte at most. If the message length is less than 1 kByte, the node sends data at a rate of 1 frame per period. If the message is more than 1 kByte, the message is divided into multiple frames, each frame sends 1 kByte of data, and the sending is completed within 1 period. Since the maximum sending capacity of the node is 12 kBytes per period, the message can be divided into 12 frames at most.

[0108] The communication node of the high-speed optical fiber multi-node reflection network is configured with local sending data. The node needs to perform both data sending and data forwarding operations, and the two operations use the same network output port, so there is a port competition. When the local sending data and the forwarding data compete for the port, the forwarding data has the priority. If the forwarding data arrives when the sending port is sending a data frame (whether local data or forwarding data), the forwarding data is first stored in the forwarding buffer and waits for the current frame to be sent. After the sending is completed, the forwarding data immediately occupies the sending port. If the local sending data arrives when the sending port is sending a data frame (whether local data or forwarding data), the local data is first stored in the local buffer. After the current frame is sent, the arbitration module first checks whether there is a data frame waiting to be sent in the forwarding buffer. If not, the local data is sent, otherwise the forwarding data is sent first.

[0109] The nuclear safety level display control device of the present application realizes photoelectric isolation, and realizes safety level communication through the mode of data back read verification by switching the running mode based on the communication isolation and the one-way transmission mode of the dual-port RAM, and meets the safety level requirements. Through the enhanced network data pre-storage and security protection technology, the data communication error rate is reduced to below 10-13, and network storm can be effectively avoided.

[0110] In one embodiment, when the nodes of the fiber ring network include non-safety level nodes, the non-safety level nodes are set as nodes that only receive data.

[0111] Specifically, when the safety level nodes in the network are configured as only sending nodes (the downlink data is 0), the communication interface of the node only passes the data of other nodes, but does not send any data to the dual-port RAM; on the contrary, when the communication interface of the non-safety level node is configured as only receiving nodes (the uplink data is 0), the node only passes the data of other nodes, and does not send the data in the dual-port RAM to the multi-node communication network. Therefore, the safety level nodes are configured as only sending nodes, and the non-safety level nodes are configured as only receiving nodes, so that the unidirectionality of the data transmission from the safety level devices to the non-safety level devices in the high-speed fiber multi-node reflection network is ensured, that is, the communication isolation between the safety level devices and the non-safety level devices is realized.

[0112] The above embodiments are only exemplary embodiments of the present application, and are not used to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements are also regarded as falling within the protection scope of the present application.

Claims

1. A fiber-optic network-based nuclear safety class graphic display unit, characterized in that, The nuclear safety level display control device is a node of a plurality of independent optical fiber networks, each of which comprises a plurality of safety level control stations and a plurality of nuclear safety level display control devices, and the nuclear safety level display control device comprises a control module, a data processing module, a fault diagnosis module, a display touch module and a plurality of optical fiber communication modules, wherein The control module is connected with the display touch module, the data processing module and the fault diagnosis module, and is configured to output a control instruction according to interaction information received by the display touch module, and transmit the control instruction to the data processing module; The data processing module is connected with the control module, the fault diagnosis module and each optical fiber communication module, and is configured to process data according to the control instruction, generate network transmission data and display data, transmit the display data to the display touch module for display through the control module, transmit the network transmission data to the optical fiber communication module, and output an enable signal to each optical fiber communication module; Each optical fiber communication module is connected with the data processing module, the fault diagnosis module and an optical fiber of one optical fiber network, and is configured to convert the network transmission data from an electrical signal into an optical signal and transmit the optical signal to the optical fiber network, and receive an optical signal transmitted on the optical fiber network and convert the optical signal into an electrical signal and transmit the electrical signal to the data processing module, so that the data processing module stores and processes the electrical signal data; The fault diagnosis module is connected with the control module, the data processing module and each optical fiber communication module, and is configured to output a first fault signal according to the state of the control module and the data processing module, and send the first fault signal to each optical fiber communication module, so that the optical fiber communication module switches a transmission path of an optical signal in the optical fiber network according to the first fault signal and the enable signal; Each optical fiber communication module comprises a bypass control signal generation unit, an optical path switching unit and an optical-electrical conversion unit, wherein The bypass control signal generation unit is connected with the data processing module, the fault diagnosis module and the optical path switching unit, and is configured to output a second fault signal according to the enable signal output by the data processing module and the first fault signal output by the fault diagnosis module; The optical path switching unit is connected with a previous node and a next node adjacent to the nuclear safety level display control device in the optical fiber network and the optical-electrical conversion unit, and is configured to connect the nuclear safety level display control device to the optical fiber network when the bypass control signal generation unit does not output the second fault signal, and connect the nuclear safety level display control device to the next node and the previous node in the optical fiber network, respectively; and disconnect the nuclear safety level display control device from the optical fiber network and connect the previous node and the next node in the optical fiber network when the bypass control signal generation unit outputs the second fault signal. The photoelectric conversion unit is connected with the data processing module and the optical path switching unit respectively, and is used for converting optical signals in the optical fiber network into electrical signals and transmitting the electrical signals to the data processing module, and converting network transmission data output by the data processing module from electrical signals into optical signals and transmitting the optical signals to the optical fiber network.

2. The fiber optic-based networking-based nuclear safety-class display and control unit of claim 1, wherein, The optical path switching unit comprises a relay and an optical switch circuit, the optical switch circuit comprises a first optical switch and a second optical switch, wherein, The relay is connected with the bypass control signal generation unit, the first optical switch and the second optical switch respectively, and is used for controlling working modes of the first optical switch and the second optical switch according to a second fault signal output by the bypass control signal generation unit; The optical switch circuit is connected with the bypass control signal generation unit, the relay, a previous node and a next node in the optical fiber ring network and the photoelectric conversion unit respectively, and is used for connecting the nuclear safety level display control device with the optical fiber network and connecting the nuclear safety level display control device with the previous node and the next node in the optical fiber network when the working modes of the first optical switch and the second optical switch are cross connection modes; and connecting the next node and the previous node in the optical fiber network when the working modes of the first optical switch and the second optical switch are direct connection modes.

3. The fiber optic network-based nuclear safety class graphic display unit of claim 2, wherein, The photoelectric conversion unit comprises a first photoelectric converter, a second photoelectric converter, a third photoelectric converter and a fourth photoelectric converter, wherein, The first photoelectric converter is connected with the first optical switch and the data processing module, and is used for converting optical signals transmitted by the previous node in the optical fiber network into electrical signals and transmitting the electrical signals to the data processing module; The second photoelectric converter is connected with the first optical switch and the data processing module, and is used for converting network transmission data of the data processing module from electrical signals into optical signals and transmitting the optical signals to the next node in the optical fiber network; The third photoelectric converter is connected with the second optical switch and the data processing module, and is used for converting optical signals transmitted by the next node in the optical fiber network into electrical signals and transmitting the electrical signals to the data processing module; The fourth photoelectric converter is connected with the second optical switch and the data processing module, and is used for converting network transmission data of the data processing module from electrical signals into optical signals and transmitting the optical signals to the previous node in the optical fiber network.

4. The fiber optic network-based nuclear safety class graphic display unit of claim 2, wherein, The bypass control signal generation unit comprises a bypass key switch, a first optical relay, a second optical relay, a third optical relay and an inductor, wherein, The first optical relay is connected with the data processing module, the inductor and the second optical relay, and is used for outputting an enable signal of the data processing module; The second optical relay is connected with the fault diagnosis module and the third optical relay, and is used for outputting a fault enable signal according to the enable signal and a first fault signal of the fault diagnosis module; The third optical relay is connected with the bypass key switch, the relay, the first optical switch and the second optical switch, and is used for outputting a second fault signal according to the fault enable signal and the bypass key switch.

5. The fiber optic network-based nuclear safety-class graphic display unit of claim 4, wherein, When the fault diagnosis module outputs a first fault signal, the data processing module outputs an enable signal and the bypass key switch is connected, the working mode of the first optical switch and the second optical switch is a direct connection mode. When the fault diagnosis module does not output a first fault signal, the data processing module does not output an enable signal or the bypass key switch is not connected, the working mode of the first optical switch and the second optical switch is a cross connection mode.

6. The fiber optic network-based nuclear safety class graphic display unit of any of claims 1-5, wherein, The display touch module comprises an LVDS transceiver, a display touch integrated screen, an I 2 C extension unit and an HDMI interface, wherein, The LVDS transceiver is connected with the control module and a display touch integrated screen respectively, and is used for converting display data of the control module from TTL / CMOS signals into LVDS differential signals and transmitting the display data to the display touch integrated screen. The HDMI interface is connected with the control module, and is used for converting display data of the control module from TTL / CMOS signals into HDMI protocol signals. The I 2 C extension unit is connected with the control module and the display touch integrated screen respectively, and is used for extending I 2 C interface to multiple, so that the control module respectively communicates with the touch signal interface and the key indication interface of the display touch integrated screen 2 C communication.

7. The fiber optic network-based nuclear safety class graphic display unit of any of claims 1-5, wherein, Each of the optical fiber networks is a redundant ring network, each of the optical fiber networks includes a plurality of reactor control stations, a plurality of safety facility trigger system control stations, a plurality of nuclear safety level display control devices, a plurality of transmission unit control stations and a gateway station, and the gateway station is further connected with a non-safety level network.

8. The fiber optic network-based nuclear safety class graphic display unit of any one of claims 1-5, wherein, The data processing module is an FPGA chip, and the FPGA chip is provided with a first data storage unit and a second data storage unit, wherein the first data storage unit is used for storing data to be transmitted by the nuclear safety level display control device to the optical fiber network, and the second data storage unit is used for storing received data of other nodes on the optical fiber network.

9. The fiber optic network-based nuclear safety class graphic display unit of any of claims 1-5, wherein, When a non-safety level node is included in the nodes of the optical fiber ring network, the non-safety level node is set as a node only receiving data.

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