Can communication board, safety controller and subsea tree
By designing a CAN communication board, the problem of poor communication reliability of safety controllers in underwater operating environments was solved. Redundant communication and status monitoring were achieved, improving the reliability and stability of the equipment and making it suitable for the upgrading and maintenance of underwater equipment.
Patent Information
- Application Number
- CN202411767613.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2044-12-04
Smart Images
Figure CN119668160B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of communication technology for underwater operating equipment, specifically to a CAN communication board, a safety controller, and an underwater wellhead. Background Technology
[0002] Safety controllers are a key technology for subsea wellheads, providing safety protection for the equipment during start-up, shutdown, process disturbances, and normal maintenance. In the event of a dangerous situation, the safety controller can react immediately and output the correct signal, bringing the equipment to a safe state or shutting it down. They are widely used in various industrial manufacturing sectors. To ensure reliable operation of subsea wellheads underwater, safety controllers typically need to acquire, monitor, and transmit various signals. However, the harsh marine environment can easily lead to anomalies in the acquisition, monitoring, and transmission of these signals, affecting the reliability of the safety controller. Summary of the Invention
[0003] Purpose of the invention: This application provides a CAN communication board to overcome the technical problem of poor communication reliability of the safety controller in the prior art; another purpose of this application is to provide a safety controller; a third purpose of this application is to provide an underwater production tree.
[0004] Technical solution: The CAN communication board described in this application embodiment is applied to a safety controller. The CAN communication board includes: a power module, a control module, a first CAN communication isolation module, a second CAN communication isolation module, a status monitoring module, and a display module.
[0005] The power supply module is electrically connected to the control module, and the control module is electrically connected to the first CAN communication isolation module, the second CAN communication isolation module, the status monitoring module, and the display module, respectively; the first CAN communication isolation module is also electrically connected to the main control board of the safety controller.
[0006] The power supply module provides power to the control module; the first CAN communication isolation module enables CAN communication between the control module and the main control board.
[0007] The status monitoring module is used to monitor the status information of the CAN communication board and send it to the control module; the second CAN communication isolation module is used to provide redundant CAN communication for the CAN communication board;
[0008] The control module is used to display the status information of the CAN communication board through the display module, and / or to output a display signal to the display module according to the status information of the CAN communication board.
[0009] In some embodiments, the power module includes a first power supply unit and a second power supply unit; the first power supply unit and the second power supply unit are respectively electrically connected to the control module; the first power supply unit and the second power supply unit are redundantly configured.
[0010] In some embodiments, the control module is a TMS570LC4357 control chip.
[0011] In some embodiments, the first CAN communication isolation module is a CAN_FD communication isolation module.
[0012] In some embodiments, the control module includes a first serial communication interface, and the CAN_FD communication isolation module communicates with the control module through the first serial communication interface.
[0013] In some embodiments, the second CAN communication isolation module includes at least four CAN communication channels; wherein each CAN communication channel is electrically connected to the control module.
[0014] In some embodiments, the status monitoring module includes at least a temperature monitoring unit, a voltage monitoring unit, and a barometric pressure monitoring unit; wherein the temperature monitoring unit, the voltage monitoring unit, and the barometric pressure monitoring unit are all electrically connected to the control module; the voltage monitoring unit is also electrically connected to the power supply module.
[0015] The temperature monitoring unit is used to monitor the temperature of the CAN communication board and send it to the control module; the voltage monitoring unit is used to monitor the voltage of the power module and the control module and send it to the control module; the air pressure monitoring unit is used to monitor the air pressure of the safety controller underwater and send it to the control module.
[0016] In some embodiments, the control module includes a second serial communication interface; the temperature monitoring unit communicates serially with the control module through the second serial communication interface.
[0017] In some embodiments, the CAN communication board further includes an analog-to-digital converter module, which is electrically connected to the air pressure monitoring unit and the control module, respectively.
[0018] In some embodiments, the display module is an LED indicator.
[0019] In some embodiments, the CAN communication board further includes an operation monitoring module; the operation monitoring module is electrically connected to the control module; the operation monitoring module is used to monitor the operating status of the control module.
[0020] Accordingly, the security controller described in this application includes the CAN communication board as described above.
[0021] Accordingly, the subsea production tree described in this application includes a safety controller as described above.
[0022] Beneficial Effects: Compared with the prior art, the CAN communication board, safety controller, and subsea wellhead of this application embodiment include: a power module, a control module, a first CAN communication isolation module, a second CAN communication isolation module, a status monitoring module, and a display module; wherein, the power module is electrically connected to the control module, and the control module is electrically connected to the first CAN communication isolation module, the second CAN communication isolation module, the status monitoring module, and the display module respectively; the first CAN communication isolation module is also electrically connected to the main control board of the safety controller; wherein, the power module is used to provide power supply voltage to the control module; the first CAN communication isolation module is used to realize CAN communication between the control module and the main control board; the status monitoring module is used to monitor the status information of the CAN communication board and send it to the control module; the second CAN communication isolation module is used to provide redundant CAN communication for the CAN communication board; the control module is used to display the status information of the CAN communication board through the display module, and / or, output a display signal to the display module according to the status information of the CAN communication board. Therefore, by providing a CAN communication board, the communication requirements of the safety controller during underwater operation can be met. Furthermore, by setting up a first CAN communication isolation module and a second CAN communication isolation module, on the one hand, the first CAN communication isolation module enables CAN communication between the CAN communication board and the main control board of the safety controller, ensuring the communication reliability of the safety controller. On the other hand, the second CAN communication isolation module provides redundant CAN communication channels for the CAN communication board to meet other CAN communication needs of the safety controller during underwater operations, which is particularly suitable for scenarios where underwater equipment updates and maintenance are inconvenient. The CAN communication board also includes a power module, a status monitoring module, and a display module, which further improves the reliability of the CAN communication board during underwater operations. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a schematic diagram of the CAN communication board provided in the embodiments of this application;
[0025] Figure 2 This is a schematic diagram of another CAN communication board provided in the embodiments of this application;
[0026] Figure 3 This is a schematic diagram of the internal circuit structure of the power module provided in the embodiments of this application;
[0027] Figure 4 This is a circuit principle structure block diagram of a control module provided in an embodiment of this application;
[0028] Figure 5 This is a schematic diagram of the circuit structure of a hardware watchdog provided in an embodiment of this application;
[0029] Figure 6 This is a schematic diagram of the communication connection of the second CAN communication isolation module provided in the embodiments of this application;
[0030] Figure 7 This is a schematic diagram of the principle structure of a CAN communication board provided in the embodiments of this application;
[0031] Figure 8 This is a front layout schematic diagram of a CAN communication board provided in an embodiment of this application;
[0032] Figure 9 This is a schematic diagram of the reverse layout of a CAN communication board provided in an embodiment of this application.
[0033] Figure label:
[0034] 10-Power supply module; 20-Control module; 30-First CAN communication isolation module; 40-Second CAN communication isolation module; 50-Status monitoring module; 60-Display module; 11-First power supply unit; 12-Second power supply unit; 21-First serial communication interface; 22-Second serial communication interface; 41-First CAN communication channel; 42-First CAN communication channel; 43-First CAN communication channel; 44-First CAN communication channel; 51-Temperature monitoring unit; 52-Voltage monitoring unit; 53-Air pressure monitoring unit; 70-Analog-to-digital conversion module; 80-Operation monitoring module. Detailed Implementation
[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0036] It should be understood that although the terms first, second, etc., may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Therefore, the first component discussed below may be referred to as the second component without departing from the teachings of this application. As used herein, the term "and / or" includes all combinations of any and more of the associated listed items.
[0037] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments and may not be to scale. The modules or processes shown in the drawings are not necessarily essential for implementing this application and therefore should not be used to limit the scope of protection of this application.
[0038] Figure 1 This is a schematic diagram of the CAN communication board provided in this embodiment. The CAN communication board is an independent standard 3U board, connected to the internal network of its LCU via a backplane CAN_FD bus. The CAN communication board includes one CPU processing unit. The CAN communication board is responsible for its own operation. It receives data from the main control board on the local LCU network and converts the data commands into CAN interface signals for external transmission; simultaneously, it receives data from the CAN interface and sends it to the main control board. The CAN communication board can also collect atmospheric pressure data and transmit it to the main control board. Furthermore, it can monitor the board's temperature and voltage. Please refer to [link to relevant documentation]. Figure 1 The CAN communication board includes: a power module 10, a control module 20, a first CAN communication isolation module 30, a second CAN communication isolation module 40, a status monitoring module 50, and a display module 60. The power module 10 is electrically connected to the control module 20, and the control module 20 is electrically connected to the first CAN communication isolation module 30, the second CAN communication isolation module 40, the status monitoring module 50, and the display module 60, respectively. The first CAN communication isolation module 30 is also electrically connected to the main control board 100 of the safety controller. The power module 10 provides power to the control module 20. The first CAN communication isolation module 30 enables CAN communication between the control module 20 and the main control board. The status monitoring module 50 monitors the status information of the CAN communication board and sends it to the control module 20. The second CAN communication isolation module 40 provides redundant CAN communication for the CAN communication board. The control module 20 displays the status information of the CAN communication board through the display module 60, and / or outputs a display signal to the display module 60 based on the status information of the CAN communication board.
[0039] The power module 10 provides power to the control module 20 to ensure reliable power supply to the safety controller and CAN communication board during underwater operations. The power module 10 can also provide power to other modules, such as the first CAN communication isolation module 30, the second CAN communication isolation module 40, the status monitoring module 50, and the display module 60. Furthermore, the control module 20 can also provide power to the first CAN communication isolation module 30, the second CAN communication isolation module 40, the status monitoring module 50, and the display module 60; the specific configuration can be adjusted according to actual needs and is not limited here.
[0040] In some embodiments, underwater operations can be any situation under or on the surface of rivers, lakes, or seas, such as seabed operations, lake bottom operations, or river bottom operations.
[0041] The power module 10 can be a lithium battery, etc., and the specific configuration can be set according to the actual situation. No specific limitations are made here. The input power of the power module 10 can be 24V, etc., and the specific configuration can be set according to the actual situation. No specific limitations are made here.
[0042] The control module 20 can be a microcontroller or other controller, and the specific configuration can be set according to the actual situation. No specific limitations are made here.
[0043] The CAN communication board's status information can include, for example, temperature, voltage, and air pressure information. The display module 60 can be an LED indicator, etc., and its specific configuration can be determined based on actual needs; no specific limitations are specified here.
[0044] In the technical solution of this embodiment, the implementation process of the CAN communication board is as follows: (See...) Figure 1The power supply module 10 is electrically connected to the control module 20, providing power to the control module 20 to ensure reliable power supply to the CAN communication board during underwater operations, thereby ensuring the communication reliability of the safety controller. The first CAN communication isolation module 30 is electrically connected to both the control module 20 and the control board 100 of the safety controller, enabling communication between the CAN communication board and the control board 100 via CAN communication, thus improving the reliability of the safety controller and ensuring normal communication functions in complex underwater environments. The second CAN communication isolation module 40 is electrically connected to the control module 20, providing redundant CAN communication to meet other CAN communication needs of the CAN communication board, especially suitable for harsh underwater environments where equipment maintenance or updates are inconvenient. The status monitoring module 50 is electrically connected to the control module 20, monitoring various status information of the CAN communication board, such as temperature and voltage information, to enable timely fault handling and ensure the reliability of the safety controller. Furthermore, the CAN communication board also includes a display module 60, which is electrically connected to the control module 20. The control module 20 can display the received status information of the CAN communication board through the display module 60, and / or output corresponding display signals to the display module 60 based on the status information of the CAN communication board. For example, the temperature information of the CAN communication board can be displayed through the display module 60. Or, if the air pressure information of the CAN communication board indicates that the air pressure exceeds a threshold, a high air pressure display message can be output to the display module 60. Furthermore, all components of the CAN board are selected as industrial-grade, high-reliability devices; the key interfaces of the CAN board adopt an isolation design to suppress functional damage caused by external impacts. For example, the CAN communication interface uses an isolation conversion chip, and a TVS diode protects the circuit; good grounding lines are added to the upper and lower parts of the CAN board PCB and external connectors to ensure good grounding of the board; the CAN board adopts a multi-layer PCB design to ensure good EMC performance. Therefore, this application provides a CAN communication board that can meet the communication needs of the safety controller during underwater operation and improve the reliability of the safety controller in underwater operations.
[0045] Figure 2 This is a schematic block diagram of another CAN communication board provided in this application embodiment. Based on the above embodiment, please refer to... Figure 2 The power module 10 includes a first power supply unit 11 and a second power supply unit 12; the first power supply unit 11 and the second power supply unit 12 are electrically connected to the control module 20 respectively; the first power supply unit 11 and the second power supply unit 12 are redundantly configured.
[0046] The first power supply unit 11 and the second power supply unit 12 are redundantly configured to provide a reliable power supply voltage for the CAN communication board, which is especially suitable for situations where equipment maintenance is inconvenient in underwater operation environments.
[0047] Both the first power supply unit 11 and the second power supply unit 12 are powered by power modules. The specific configuration can be adjusted according to actual conditions, and no specific limitations are made here.
[0048] The first power supply unit 11 and the second power supply unit 12 can be 24V power input, and the specific settings can be configured according to the actual situation. No specific limitations are made here.
[0049] Figure 3 This is a schematic diagram of the internal circuit structure of the power module provided in the embodiments of this application. Please refer to... Figure 3 The power module 10 (taking 24V as an example) uses a power isolation module when connected to the first power supply unit 11 and the second power supply unit 12. The power isolation module allows an input voltage of 24VDC (DC 16.8V-DC 30V) and an output voltage of 24VDC ±2%. Specifically, the 24V input voltage is output as 12VDC ±2% after passing through the power isolation module. This 12VDC ±2% output from the power isolation module can be connected to three power chip outputs: 5VDC ±5%, 3.3VDC ±5%, and 1.2VDC ±2.25%. These power accuracies meet the operational requirements of subsequent chips.
[0050] In some embodiments, please continue reading Figure 2 The control module 20 includes a first serial communication interface 21, and the CAN_FD communication isolation module communicates with the control module 20 through the first serial communication interface 21.
[0051] Among them, the first CAN communication isolation module 30 is a CAN_FD communication isolation module.
[0052] The first serial communication interface 21 can be a serial peripheral interface (SPI).
[0053] In some embodiments, please continue reading Figure 2 The second CAN communication isolation module 40 includes at least four CAN communication channels; each CAN communication channel is electrically connected to the control module 20.
[0054] For example, please refer to Figure 2These four CAN communication channels include a first CAN communication channel 41, a second CAN communication channel 42, a third CAN communication channel 43, and a fourth CAN communication channel 44. Among them, the first CAN communication channel 41, the second CAN communication channel 42, the third CAN communication channel 43, and the fourth CAN communication channel 44 are all electrically connected to the control module 20.
[0055] Among them, the first CAN communication channel 41, the second CAN communication channel 42, the third CAN communication channel 43 and the fourth CAN communication channel 44 are used to provide additional CAN communication interfaces for the CAN communication board so that CAN signals can be accessed at any time, thus making it suitable for underwater operation environments where equipment updates and maintenance are inconvenient.
[0056] Among them, the first CAN communication channel 41, the second CAN communication channel 42, the third CAN communication channel 43, and the fourth CAN communication channel 44 are CAN signal acquisition channels, providing four channels to meet the signal acquisition needs of more CAN sensors and improve the stability and transmission efficiency of data acquisition.
[0057] In some embodiments, please continue reading Figure 2 The status monitoring module 50 includes at least a temperature monitoring unit 51, a voltage monitoring unit 52, and a pressure monitoring unit 53; wherein the temperature monitoring unit 51, voltage monitoring unit 52, and pressure monitoring unit 53 are all electrically connected to the control module 20; the voltage monitoring unit 52 is also electrically connected to the power module 10; wherein the temperature monitoring unit 51 is used to monitor the temperature of the CAN communication board and send it to the control module 20; the voltage monitoring unit 52 is used to monitor the voltage of the power module 10 and the control module 20 and send it to the control module 20; the pressure monitoring unit 53 is used to monitor the pressure of the safety controller underwater and send it to the control module 20.
[0058] The temperature monitoring unit 51 can be a temperature sensor, etc. The voltage monitoring unit 52 can be a voltage detection device, such as a voltage transformer, etc. The air pressure monitoring unit 53 can be a pressure sensor.
[0059] Specifically, the temperature monitoring unit 51, voltage monitoring unit 52, and air pressure monitoring unit 53 are all electrically connected to the control module 20, and the voltage monitoring unit 52 is also electrically connected to the power module 10. The temperature monitoring unit 51 monitors the temperature of the CAN communication board in real time and sends it to the control module 20. The control module 20 receives the temperature of the CAN communication board and sends it to the display module 60 for display, and / or determines whether the temperature of the CAN communication board exceeds a preset temperature (the specific value can be set according to actual conditions and is not specifically limited here). If it exceeds the preset temperature, it outputs a display signal corresponding to the excessively high temperature to the display module 60 for display. Similarly, the voltage monitoring unit 52 monitors the voltage of the CAN communication board and the power module 10 in real time and sends it to the control module 20. The control module 20 receives the voltage of the CAN communication board and the power module 10 and sends it to the display module 60 for display, and / or determines whether the voltage of the CAN communication board and the power module 10 is abnormal (e.g., exceeding a first preset voltage or falling below a second preset voltage), and outputs the corresponding display signal to the display module 60 for abnormal or normal results. The air pressure monitoring unit 53 monitors the air pressure of the CAN communication board in real time and sends it to the control module 20. The control module 20 sends the received air pressure of the CAN communication board to the display module 60 for display, and / or determines whether the air pressure of the CAN communication board is abnormal (e.g., exceeding the first preset air pressure, or being lower than the second preset air pressure) based on the air pressure, and outputs the corresponding display signal to the display module 60 for the abnormal or normal result.
[0060] The status monitoring module 50 includes a voltage monitoring unit 52, a temperature monitoring unit 51, and a pressure monitoring unit 53. The voltage monitoring unit 52 can monitor the voltage status in real time and will generate fault status feedback in case of abnormal voltage. The temperature monitoring unit 51 and the pressure monitoring unit 53 can monitor the temperature and pressure near the board in real time, allowing the user to understand the environmental conditions of the board's operation. Once the environment exceeds the design applicable range, an operational status feedback alarm will be provided.
[0061] The specific values of the first preset voltage, the second preset voltage, the first preset air pressure, and the second preset air pressure can be set according to the actual situation, and no specific limitation is made here. The voltage threshold settings for the CAN communication board and the power module 10 can be the same or different, depending on the actual situation, and no specific limitation is made here.
[0062] In some embodiments, please continue reading Figure 2 The control module 20 includes a second serial communication interface 22; the temperature monitoring unit 51 communicates serially with the control module 20 through the second serial communication interface 22.
[0063] The second serial communication interface 22 can be an I2C serial communication interface.
[0064] In some embodiments, please continue reading Figure 2 The CAN communication board also includes an analog-to-digital converter module 70, which is electrically connected to the air pressure monitoring unit 53 and the control module 20, respectively.
[0065] The analog-to-digital conversion module 70 is used to convert the voltage monitored by the air pressure monitoring unit 53 into a digital signal and send it to the control module 20.
[0066] In some embodiments, please continue reading Figure 2 The CAN communication board also includes a running monitoring module 80; the running monitoring module 80 is electrically connected to the control module 20; the running monitoring module 80 is used to monitor the running status of the control module 20.
[0067] Among them, the operation monitoring module 80 can monitor the operating status of the board in real time and provide feedback alarms when a fault occurs.
[0068] The operation monitoring module 80 can use a hardware watchdog circuit.
[0069] In some embodiments, the control module 20 is a TMS570LC4357 control chip.
[0070] The control module 20 can utilize the TMS570LC4357. This chip is based on the ARM Cortex-R5F core, with a maximum operating frequency of 300MHz. It has 4Mbytes of Flash memory and 512KB of RAM, both of which support hardware self-testing. It also features a dual-core design with lockstep functionality, where the two cores operate synchronously and compare data to ensure correct processor operation. Furthermore, it has two independent 64-bit counters. The chip's interfaces include: one 10 / 100M Ethernet interface, four CAN controllers, two I2C modules, five MIBSPI interfaces, a 16-bit external memory interface (EMIF), two N2HET interfaces, two 12-bit resolution MIBADC converters (one with 32 channels and the other with 25 channels), and four Universal Asynchronous Receiver / Transmitter (UART) interfaces.
[0071] Figure 4 This is a circuit diagram illustrating the structural principle of a control module provided in an embodiment of this application. Please refer to [link / reference]. Figure 4 The control module, namely the Central Processing Unit (CPU), is electrically connected to the hardware watchdog and the JTAG interface.
[0072] Figure 5This is a schematic diagram of the circuit structure of a hardware watchdog provided in an embodiment of this application. Please refer to... Figure 5 The hardware watchdog circuit includes: a voltage detector chip U0, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a first capacitor C1. The voltage detector chip U0 uses a MAX6371KA+T watchdog chip. The CPU module uses the MAX6371KA+T watchdog chip to monitor CPU operation. Upon power-up, the MAX6371KA+T delays startup and provides a hardware watchdog with a time window. The watchdog time window can be set from 300ms to 900ms depending on the resistor configuration. The CPU needs to send a pulse to feed the watchdog within the specified time; otherwise, the watchdog chip outputs a reset signal.
[0073] In some embodiments, the first CAN communication isolation module is a CAN_FD communication isolation module.
[0074] The CAN-FD communication isolation module mainly uses an isolation chip to isolate the SPI signal, and the SPI to CANFD driver device realizes signal communication.
[0075] In some embodiments, the second CAN communication isolation module is a standard CAN communication isolation module.
[0076] The CAN communication isolation module mainly uses isolated CAN driver devices to achieve signal isolation and communication.
[0077] Figure 6 This is a schematic diagram of the communication connection of the second CAN communication isolation module provided in the embodiments of this application. For example, see [link to relevant documentation]. Figure 6 The second CAN communication isolation module 40 is electrically connected to the external interface module and the control module (i.e., CPU) respectively.
[0078] Figure 7 This is a schematic diagram illustrating the principle structure of a CAN communication board provided in an embodiment of this application. For example, see [link to relevant documentation]. Figure 7The control module 20 of the CAN communication board uses the TITMS570 control chip. This control chip includes an SPI interface, two GPIO interfaces, an ADC module, a CAN signal interface, an I2C interface, and an SCI interface. The SCI interface is electrically connected to the temperature monitoring unit 51, the ADC module is electrically connected to the air pressure monitoring unit 53, the SPI interface is electrically connected to the two CAN_FD communication isolation modules, one GPIO interface is electrically connected to the LED indicator (i.e., display module 60), another GPIO interface is electrically connected to the ID reader, and the CAN signal interface is electrically connected to the four CAN communication isolation modules. Other main functions implemented by the CPU include: First, LED control: the working state of the LEDs is controlled by the CPU to indicate various CPU operating states. Second, reading the values of various voltages on the board. The CPU has two built-in ADC modules with 10-bit accuracy, using the ADCs to collect all operating voltages on the circuit board and sending the converted values back to the CPU for processing. Third, reading the temperature signal from the main control board. The CPU has a built-in I2C module, using the I2C bus to collect temperature data from the temperature sensor and process it accordingly. Fourth, CPU internal resource self-test. The CPU supports an internal self-test function, performing self-tests of its internal functions during system power-on and normal operation. Fifth, external hardware watchdog module. The CPU feeds the external watchdog circuit by sending a square wave through a pin. The CPU module uses the MAX6371KA+T watchdog chip to monitor CPU operation. Upon power-on, the MAX6371KA+T starts with a delay, providing a hardware watchdog with a time window. The watchdog time window can be set from 300ms to 900ms depending on the resistor configuration. The CPU needs to send a pulse to feed the watchdog within the specified time; otherwise, the watchdog chip outputs a reset signal.
[0079] Figure 8 This is a front layout diagram of a CAN communication board provided in an embodiment of this application. Figure 9 This is a schematic diagram of the reverse layout of a CAN communication board provided in an embodiment of this application. Please refer to... Figure 8 and Figure 9 The CAN communication board is a standalone standard 3U board connected to the local LCU internal network via the backplane CAN_FD bus. The CAN communication board includes a control module 20. The CAN communication board is responsible for its own operation. It receives data from the main control board 100 of the safety controller from the local LCU internal network and converts the data commands into CAN interface signals for external transmission; simultaneously, it receives data from the CAN interface and sends it to the main control board. The CAN communication board can also collect atmospheric pressure data and transmit it to the main control board. Furthermore, the CAN communication board can monitor the board's temperature and voltage.
[0080] The CAN communication board adopts a 3U width design, with a width of 100mm and a length of 180mm. The front panel is 4HP wide, and the rear connector uses a 53PIN J27A-53ZKL connector. The board adopts a fanless passive cooling design.
[0081] The CAN communication expansion board uses industrial-grade components, and the board's heat dissipation is designed for 10W, with the board's power consumption controlled at 6W.
[0082] Accordingly, embodiments of this application also provide a security controller, which includes the CAN communication board described in any embodiment of this application.
[0083] Accordingly, embodiments of this application also provide a subsea production tree, which includes the safety controller described in any embodiment of this application.
[0084] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0085] The CAN communication board, safety controller, and subsea wellhead provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A CAN communication board, characterized in that, For underwater operations of submerged wellhead safety controllers, the CAN communication board includes: a power module, a control module, a first CAN communication isolation module, a second CAN communication isolation module, a status monitoring module, and a display module; The power supply module is electrically connected to the control module, and the control module is electrically connected to the first CAN communication isolation module, the second CAN communication isolation module, the status monitoring module, and the display module, respectively; the first CAN communication isolation module is also electrically connected to the main control board of the safety controller. The power supply module provides power to the control module; the first CAN communication isolation module enables CAN communication between the control module and the main control board. The status monitoring module is used to monitor the status information of the CAN communication board and send it to the control module; the second CAN communication isolation module is used to provide redundant CAN communication for the CAN communication board; The control module is used to display the status information of the CAN communication board through the display module, and / or to output a display signal to the display module according to the status information of the CAN communication board; The power module includes a first power supply unit and a second power supply unit; the first power supply unit and the second power supply unit are respectively electrically connected to the control module; the first power supply unit and the second power supply unit are redundantly configured. The first CAN communication isolation module is a CAN_FD communication isolation module; The control module includes a first serial communication interface, and the CAN_FD communication isolation module communicates with the control module through the first serial communication interface; the CAN communication board is connected to the local LCU internal network through the backplane CAN_FD bus.
2. The CAN communication board according to claim 1, characterized in that, The control module is a TMS570LC4357 control chip.
3. The CAN communication board according to claim 1, characterized in that, The second CAN communication isolation module includes at least four CAN communication channels; each CAN communication channel is electrically connected to the control module.
4. The CAN communication board according to claim 1, characterized in that, The status monitoring module includes at least a temperature monitoring unit, a voltage monitoring unit, and a barometric pressure monitoring unit; wherein the temperature monitoring unit, the voltage monitoring unit, and the barometric pressure monitoring unit are all electrically connected to the control module; the voltage monitoring unit is also electrically connected to the power supply module; The temperature monitoring unit is used to monitor the temperature of the CAN communication board and send it to the control module; the voltage monitoring unit is used to monitor the voltage of the power module and the control module and send it to the control module; the air pressure monitoring unit is used to monitor the air pressure of the safety controller underwater and send it to the control module.
5. The CAN communication board according to claim 4, characterized in that, The control module includes a second serial communication interface; the temperature monitoring unit communicates serially with the control module through the second serial communication interface.
6. The CAN communication board according to claim 4, characterized in that, It also includes an analog-to-digital conversion module, which is electrically connected to the air pressure monitoring unit and the control module, respectively.
7. The CAN communication board according to claim 1, characterized in that, The display module is an LED indicator.
8. The CAN communication board according to claim 1, characterized in that, It also includes a monitoring module; the monitoring module is electrically connected to the control module; the monitoring module is used to monitor the operating status of the control module.
9. A safety controller, characterized in that, Includes the CAN communication board as described in any one of claims 1-8.
10. A subsea oil production tree, characterized in that, Includes the security controller as described in claim 9.
Citation Information
Patent Citations
Communication system
CN107085395A
Underwater simple control module applicable to shallow-water Christmas tree
CN111720097A
Two-out-of-two data communication board card with extremely high reliability
CN113556239A
STM32-based power distribution cabinet monitoring system and method
CN115145204A
Underwater pressure and temperature integrated transmitter
CN115493641A