Industrial control system for clock synchronization

Abstract

The utility model belongs to the technical field of Ethernet communication systems, and particularly discloses a clock synchronization industrial control system, which comprises an industrial control subsystem, a first time server and a second time server, and is characterized in that the first time server is used for being connected with a satellite to receive satellite signals and generate first calibration signals to calibrate internal time of the satellite signals; the main control subsystem is in signal connection with the plurality of industrial control subsystems; the second time server is used for being connected with a satellite to receive a satellite signal and generate a second calibration signal, is in signal connection with the plurality of industrial control subsystems, and is used for calibrating the internal time of the first time server by using the second calibration signal and synchronously sending the internal time to each industrial control subsystem when the first time server breaks down or loses the satellite signal. According to the utility model, the time correctness and consistency of each industrial control subsystem can be ensured, and the first time server and the second time server are arranged in a redundant manner, so that the time consistency of other equipment in the network is ensured not to be influenced by the fault of a single switching node.

Description

Technical Field

[0001] The utility model belongs to the technical field of Ethernet communication systems, and particularly relates to a clock synchronous industrial control system. Background Art

[0002] Coal chemical industry refers to the process of using coal as raw material and converting it into gas, liquid and solid fuels and chemicals through chemical processing. It mainly includes coal gasification, liquefaction, carbonization, tar processing and calcium carbide acetylene chemical industry. Coal chemical processing process. The chemical structure of organic matter in coal is a macromolecular structure with aromatic condensed rings as the core unit, connected by bridge bonds and with various functional groups. Through thermal processing and catalytic processing, coal can be converted into various fuels and chemical products.

[0003] When converting coal into various fuels and chemical products, different coal chemical production equipment is needed. Coal chemical production equipment needs to use DCS system to complete production process control, SIS system to complete production process safety assurance, GDS system to complete the monitoring of combustible and toxic gas alarms in the whole plant, PLC system to complete complete equipment control, and ITCC system to complete unit control. These multiple control systems are independent of each other, but interrelated.

[0004] In actual production, it is difficult to ensure the safe and smooth operation of each industrial control subsystem due to the asynchrony of time between systems. Especially when a failure or accident occurs, it is difficult to effectively analyze the failure and accurately query the accident due to the asynchrony of time. Utility Model Content

[0005] In view of the above-mentioned problems, the purpose of the utility model is to provide a clock-synchronized industrial control system, which can improve the time accuracy and consistency of multiple control systems controlling coal chemical production equipment.

[0006] The technical solution of the utility model is: a clock synchronous industrial control system, comprising:

[0007] Multiple industrial control subsystems;

[0008] The first time server is used to connect to the satellite to receive the satellite signal, generate a first calibration signal to calibrate the internal time of the first time server, and the first time server is respectively connected to the plurality of industrial control subsystems by signal, and is used to synchronously send the calibrated internal time of the first time server to each industrial control subsystem;

[0009] The second time server is used to connect to the satellite to receive satellite signals and generate a second calibration signal. The second time server is signal-connected to multiple industrial control subsystems respectively, and is used to calibrate the internal time of the second time server using the second calibration signal and send it to each industrial control subsystem when the first time server fails or loses the satellite signal.

[0010] Furthermore, the first time server has a calibration module, and the calibration module is used to compare and calibrate the first calibration signal with the internal time of the first time server to generate a time source.

[0011] Furthermore, the first time server has a fault detection module, and the fault detection module is used to detect whether the first time server fails or loses satellite signals.

[0012] Furthermore, the first time server also has an automatic switching module, and the automatic switching module is used to switch any one of the first time server and the second time server to synchronously send the time source to each industrial control subsystem.

[0013] Furthermore, the first time server is provided with an antenna interface, and the antenna interface is used to connect to a satellite to receive satellite signals.

[0014] Furthermore, the antenna interface is used to connect to a GPS satellite or a Beidou satellite to receive satellite signals.

[0015] Furthermore, the first time server is provided with an Ethernet port, and the Ethernet port is used for setting different network segments, and the Ethernet port adopts a 10 / 100M adaptive Ethernet port.

[0016] Furthermore, the industrial control subsystems are all equipped with switches;

[0017] The first time server has a first console configuration management interface, and the first console configuration management interface is connected to the switch in a one-to-one correspondence;

[0018] The second time server has a second console configuration management interface, and the second console configuration management interface is connected to the switch in a one-to-one correspondence.

[0019] Furthermore, the first console configuration management interface and the second console configuration management interface are both connected to the switch via a network cable.

[0020] Furthermore, the first time server performs network time synchronization for each of the industrial control subsystems based on the NTP / SNTP protocol.

[0021] The working method of the utility model is as follows: the first time server receives GPS and Beidou satellite signals for the first time through the antenna interface, and performs network timing for each industrial control system based on the NTP / SNTP protocol by setting different network segments for the Ethernet port. The first time server is used as a time synchronization source to provide time information to each industrial control system.

[0022] The First Time Server regularly calibrates the time information through the time calibration module. It receives GPS and Beidou satellite signals through the antenna interface every half hour. After receiving the signal, the First Time Server will compare it with the internal time. If it finds that there is a deviation between the internal time and the signal, the First Time Server will automatically adjust it to keep the internal time consistent with the quasi-signal.

[0023] In addition, a second time server added every two hours receives GPS and BeiDou satellite signals through a backup antenna interface and compares them with the signals received by the first time server.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] The utility model is based on the first time server, which ensures the time correctness and consistency of each industrial control subsystem, and is based on the existing Ethernet communication equipment and protocol for clock synchronization. When promoted, it can be implemented on the existing industrial control subsystem, and each industrial control system can perform tasks within the coordinated time boundary, which improves the real-time and responsiveness of the system. The accuracy of clock synchronization meets the 100ms requirement of production process control, ensures the consistency and accuracy of the operation records, trend records, and SOE records of each system, and ensures the safe and stable operation of each industrial control subsystem.

[0026] Furthermore, through regular calibration and synchronization with reliable clock signals, the First Time Server provides accurate time services to other devices in the network, ensuring normal and efficient operation of the system.

[0027] In addition, the added second time server is redundantly set up with the first time server. When the first time server fails or loses the calibration signal, the second time server can automatically take over and provide time services. This helps ensure that the time consistency of other devices in the network is not affected by the failure of a single switching node. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a system module diagram of the utility model. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1, the specific implementation methods of the utility model are described in detail. In the description of the utility model, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0031] It should be noted that the circuit connections involved in the present invention all adopt conventional circuit connection methods and do not involve any innovation.

[0032] Example

[0033] like Figure 1 A clock-synchronized industrial control system shown includes an industrial control subsystem, a first time server, and a second time server. There are multiple industrial control subsystems, and it should be noted that the industrial control subsystems proposed in this embodiment are control systems required for coal chemical production equipment, specifically a DCS system for production process control, a SIS system for safety assurance of the production process, a GDS system for monitoring combustible and toxic gas alarms throughout the plant, an ITCC system for unit control, and a PLC system for complete equipment control. Among them, the DCS system is a distributed control system, the SIS system is a safety instrument system, the GDS system is a gas detection alarm system, the ITCC system is a compressor / turbine integrated control system, and the PLC system is a programmable logic control system.

[0034] The first time server is used to connect to the satellite to receive satellite signals, generate a first calibration signal to calibrate the internal time of the first time server, and the first time server is signal-connected to multiple industrial control subsystems respectively, and is used to synchronously send the calibrated internal time of the first time server to each industrial control subsystem.

[0035] The second time server is used to connect to the satellite to receive satellite signals and generate a second calibration signal. The second time server is signal-connected to multiple industrial control subsystems respectively, and is used to calibrate the internal time of the second time server using the second calibration signal and send it to each industrial control subsystem when the first time server fails or loses the satellite signal.

[0036] Preferably, the first time server has a calibration module, which is used to compare and calibrate the first calibration signal with the internal time of the first time server to generate a time source. It should be noted that in actual applications, due to the influence of various factors, such as signal interference, transmission delay, etc., absolute zero error is difficult to achieve, so the time calibration module is used to perform automatic calibration regularly to reduce the error of time information. Among them, the first time server can be set to perform automatic calibration once every half hour.

[0037] Preferably, the first time server has a fault detection module, and the fault detection module is used to detect whether the first time server fails or loses the satellite signal.

[0038] Preferably, the first time server also has an automatic switching module, which is used to switch any server of the first time server and the second time server to send the time source synchronously to each industrial control subsystem. Each industrial control subsystem selects an internal server in the system for configuration, connects to the first time server through the corresponding switch, obtains the clock from the first time server, and other devices in each industrial control subsystem obtain the clock source from the internal server, and are all configured for automatic synchronization. After receiving the time information from the first time server, the internal server calibrates the time inside the industrial control subsystem according to the information, and adjusts its own clock accordingly.

[0039] Preferably, the first time server is provided with an antenna interface, and the antenna interface is used to connect to a satellite to receive satellite signals. The first time server receives satellite signals through the antenna interface, and can achieve high-precision time synchronization. For example, the Beidou first time server uses the high-precision time signal provided by the Beidou satellite to achieve time synchronization at the microsecond level, which is more accurate than other network-based time synchronization solutions. Among them, the second time server is also provided with a spare antenna interface that is the same as the antenna interface on the first time server for connecting to a satellite to receive satellite signals.

[0040] Preferably, the antenna interface is used to connect to a GPS satellite or a Beidou satellite to receive satellite signals. In actual use, the antenna interface is used to connect to either a GPS satellite or a Beidou satellite or both simultaneously.

[0041] Preferably, the first time server is provided with an Ethernet port, the Ethernet port is used for setting different network segments, the Ethernet port adopts a 10 / 100M adaptive Ethernet port, and the number of Ethernet ports is preferably 15 to 25. In this embodiment, the Ethernet port is 20 independent 10 / 100M adaptive Ethernet ports.

[0042] Preferably, each industrial control subsystem is equipped with a switch; the first time server has a first console configuration management interface, which is connected to the switch in a one-to-one correspondence; the second time server has a second console configuration management interface, which is connected to the switch in a one-to-one correspondence. The first console configuration management interface and the second console configuration management interface have the same structure, and both the first console configuration management interface and the second console configuration management interface have 15 to 25, and the present embodiment has 20, which are collectively referred to as console configuration management interfaces.

[0043] Preferably, the first console configuration management interface and the second console configuration management interface are connected to the switch through a network cable. The switch is configured and managed by means of a physical connection, which is particularly useful when the network connection is unavailable or initial configuration is required. Management using the Console interface does not rely on the network. Even if there is a problem with the network connection or it is unavailable, the device can be configured and managed through the Console interface to ensure that the network device can work properly.

[0044] Preferably, the first time server performs network time synchronization for each industrial control subsystem based on the NTP / SNTP protocol. The NTP / SNTP protocol can provide time synchronization accuracy at the millisecond to microsecond level, meeting the strict requirements of industrial control systems for time accuracy. The implementation of the NTP / SNTP protocol is relatively simple, and time synchronization can be achieved through software configuration without the need for additional hardware equipment, reducing deployment costs and management complexity.

[0045] The working principle of the above embodiment is:

[0046] The first time server receives GPS and Beidou satellite signals for the first time through the antenna interface, and performs network timing for each industrial control system based on the NTP / SNTP protocol by setting different network segments for the Ethernet port. The first time server serves as the time synchronization source and provides time information to each industrial control system.

[0047] The First Time Server regularly calibrates the time information through the time calibration module. It receives GPS and Beidou satellite signals through the antenna interface every half hour. After receiving the signal, the First Time Server will compare it with the internal time. If it finds that there is a deviation between the internal time and the signal, the First Time Server will automatically adjust it to keep the internal time consistent with the quasi-signal.

[0048] In addition, a second time server added every two hours receives GPS and BeiDou satellite signals through a backup antenna interface and compares them with the signals received by the first time server.

[0049] In actual use, the fault detection module is used to monitor whether the first time server fails or loses the satellite signal. If so, based on the connection interface established between the first time server and each industrial control subsystem, the calibration module can use the second time server to receive the second calibration signal to calibrate the internal time and provide time information to each industrial control system.

[0050] The specific models of the above electronic components are not specially specified, and ordinary products available on the market can be selected as long as they can meet the use requirements of the utility model.

[0051] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. A clock-synchronized industrial control system, characterized in that: include: Multiple industrial control subsystems; The first time server is used to connect to the satellite to receive the satellite signal, generate a first calibration signal to calibrate the internal time of the first time server, and the first time server is respectively connected to the plurality of industrial control subsystems by signal, and is used to synchronously send the calibrated internal time of the first time server to each industrial control subsystem; The second time server is used to connect to the satellite to receive satellite signals and generate a second calibration signal. The second time server is signal-connected to multiple industrial control subsystems respectively, and is used to calibrate the internal time of the second time server using the second calibration signal and send it to each industrial control subsystem when the first time server fails or loses the satellite signal.

2. A clock-synchronized industrial control system as claimed in claim 1, characterized in that: The first time server has a calibration module, and the calibration module is used to compare and calibrate the first calibration signal with the internal time of the first time server to generate a time source.

3. A clock-synchronized industrial control system as claimed in claim 2, characterized in that: The first time server has a fault detection module, and the fault detection module is used to detect whether the first time server fails or loses satellite signals.

4. A clock-synchronized industrial control system as claimed in claim 3, characterized in that: The first time server also has an automatic switching module, which is used to switch between any one of the first time server and the second time server to synchronously send the time source to each industrial control subsystem.

5. A clock-synchronized industrial control system as claimed in claim 1, characterized in that: The first time server is provided with an antenna interface, and the antenna interface is used to connect to a satellite to receive satellite signals.

6. A clock-synchronized industrial control system as claimed in claim 5, characterized in that: The antenna interface is used to connect to a GPS satellite or a Beidou satellite to receive satellite signals.

7. A clock-synchronized industrial control system as claimed in claim 1, characterized in that: The first time server is provided with an Ethernet port, and the Ethernet port is used for setting different network segments, and the Ethernet port adopts a 10 / 100M adaptive Ethernet port.

8. A clock-synchronized industrial control system as claimed in claim 1, characterized in that: Each of the industrial control subsystems is provided with a switch; The first time server has a first console configuration management interface, and the first console configuration management interface is connected to the switch in a one-to-one correspondence; The second time server has a second console configuration management interface, and the second console configuration management interface is connected to the switch in a one-to-one correspondence.

9. A clock-synchronized industrial control system as claimed in claim 8, characterized in that: The first console configuration management interface and the second console configuration management interface are both connected to the switch via a network cable.

10. A clock-synchronized industrial control system according to claim 1, characterized in that: The first time server performs network time synchronization for each of the industrial control subsystems based on the NTP / SNTP protocol.

Images