'AND' logic signal terminal module for nuclear-grade DCS (Distributed Control System)

Abstract

The utility model discloses an AND logic signal terminal module used for a nuclear grade DCS, the terminal module is connected with an output channel of a DO board card, is used for carrying out AND operation on an output signal of the DO board card, and comprises a PCB circuit board, a double-layer wiring terminal and two groups of DB25 female joints, one sides of the two groups of DB25 female joints are respectively connected with an output channel of the first DO board card and an output channel of the second DO board card, and the other sides of the two groups of DB25 female joints are connected to the PCB; and the PCB is connected with the double-layer wiring terminal. According to the utility model, the AND logic signal terminal module integrating the terminal, the cable plug and the internal wiring circuit is designed through a modularization method, and through the modularization internal wiring design and the connection between the prefabricated cable and the DO board card, the efficiency and quality of design, complete set and maintenance can be improved, and the risk of human errors can be greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power plant safety-grade DCS design technology, specifically to an AND logic signal terminal module for nuclear-grade DCS. Background Technology

[0002] Nuclear power plant safety-grade DCS is used to implement emergency reactor shutdown and dedicated safety facility actuation functions, bringing the reactor to a safe and controllable state. In a safety-grade DCS, each safety sequence is equipped with a dedicated safety facility actuation control station to implement dedicated safety facility actuation functions. When the dedicated safety facility actuation function is triggered, the output DO signal typically needs to control multiple actuators to operate simultaneously. To avoid multiple actuators malfunctioning due to a single DO failure, the control station commonly outputs dual DO signals to drive the actuators; only when both DOs operate simultaneously will the relevant actuators be triggered. The dual DO signals are arranged on two independent DO boards. The signal lines of each DO board are first connected to the input side of two sets of terminal blocks composed of distributed terminals, and then the output sides of the two sets of terminals are connected in series through jumpers to achieve the "AND" logic function design requirements of the two signals. The existing technology has the following technical problems:

[0003] (1) The wiring between the distributed terminal input side and the DO board is a loose wire. The connection point of each wire core needs to be designed and wired in a set. The design, assembly and maintenance process is inefficient and easily introduces the risk of human error.

[0004] (2) The short-wire design on the output side of the distributed terminal is complicated, resulting in low efficiency in the design, assembly and maintenance process, and is prone to human error risk.

[0005] (3) Distributed terminals consist of multiple independent terminal pieces, resulting in low assembly efficiency and a high risk of human error.

[0006] (4) Independent terminal blocks do not have on / off switching function and cannot isolate each output signal;

[0007] (5) Independent terminal blocks occupy a large amount of space in the rack rails, resulting in a low signal density in the rack.

[0008] Existing patent CN117991677A discloses a control system for a test device of a nuclear power plant protection system. The system includes: a test bench, a computer, a portable printer, a chassis, an aviation socket, and test cables. The system also includes a central processing unit (CPU) and a data storage unit, an LVDS communication module, a trigger circuit module, a power supply module, DI cards, and DO cards connected to the CPU. The trigger circuit module includes internal and external trigger circuits. The DI cards and DO cards communicate with the CPU via the LVDS communication module and a signal adapter card. The computer is used for human-computer interaction and communication with the CPU. The printer is used to print test data. The chassis consists of a back panel and a housing, inside which is located a space for mounting the CPU and a power supply module. The system includes working slots for the source module and I / O boards, supporting high-speed data communication via the LVDS bus backplane. The power module provides power to the chassis. The central processing unit (CPU) processes data and communicates with DI cards, DO cards, and the computer. The DI card acquires data and transmits it to the CPU, while the DO card transmits data from the CPU to backend devices. The test cable connects the test bench to the aviation socket of the cabinet under test, enabling data transmission between the test bench and the cabinet. The internal trigger circuit controls the synchronous operation of other cards by the CPU. When an internal card receives the same trigger signal, it begins output or acquisition. The external trigger signal controls the synchronous operation of external systems by the CPU, which is an important condition for synchronous operation between multiple systems.

[0009] Existing patent CN109283920B discloses a testing device and a testing method for DCS system connection failures. The device includes a device board, a chassis, and a panel. The device board includes a PCB (Printed Circuit Board), various types of paired connectors, and a toggle switch. The PCB is used to solder the various types of paired connectors and the toggle switch. The paired connectors are used to connect the DCS system under test external to the testing device and the toggle switch. The toggle switch is used to connect or disconnect a single wire between the paired connectors.

[0010] In summary, neither of the two existing patents addresses the problems of high design complexity, large cabinet space occupation, and low overall efficiency in existing functional hardware implementation methods, which are detrimental to the design, manufacturing, and maintenance of DCS. Utility Model Content

[0011] Based on the above-mentioned technical problems, this utility model proposes an AND logic signal terminal module for nuclear-level DCS, which solves the problems of high design complexity, large cabinet space occupation, and low overall efficiency in the existing functional hardware implementation methods, which are not conducive to the design, manufacturing and maintenance of DCS.

[0012] To achieve the above objectives, this utility model proposes an AND logic signal terminal module for a core-level DCS.

[0013] An AND logic signal terminal module for a nuclear-level DCS is provided. The terminal module is connected to the output channel of a DO board and is used to perform AND operations on the output signals of the DO board. The terminal module includes: a PCB circuit board, double-layer terminal blocks, and two sets of DB25 female connectors.

[0014] One side of each of the two sets of DB25 female connectors is connected to the output channel of the first DO board and the output channel of the second DO board, respectively, and the other side of each of the two sets of DB25 female connectors is connected to the PCB circuit board.

[0015] The PCB circuit board is connected to the double-layer terminal block.

[0016] Furthermore, the order of the pins of the two sets of DB25 female connectors and the double-layer wiring terminals is consistent with the order of the corresponding DO board output channels.

[0017] Furthermore, the first DO board and the second DO board have the same number and arrangement order of output channels, and the same output channels of the first DO board and the second DO board are connected in series in the PCB circuit board.

[0018] Furthermore, it also includes: an on / off switch, the two ends of which are respectively connected to the PCB circuit board and the double-layer terminal block.

[0019] Furthermore, the double-layer terminal block is provided with an external wiring port for connecting to an external cable.

[0020] Furthermore, the terminal modules are arranged in a mirror image, which facilitates the installation of guide rails on the left and right sides of the cabinet.

[0021] Furthermore, it also includes a guide rail retainer for mounting the terminal module.

[0022] Furthermore, the two sets of DB25 female connectors are arranged laterally at the top and bottom of the terminal module, respectively.

[0023] Furthermore, the terminal module includes 8 sets of double-layer wiring terminals.

[0024] Furthermore, the terminal module includes 16 on / off switches.

[0025] Furthermore, it also includes: a protective cover for the on / off switch.

[0026] Based on the above technical solution, this utility model has at least the following beneficial effects:

[0027] 1. The terminal module proposed in this utility model includes two sets of DB25 female connectors, a PCB circuit board and double-layer wiring terminals. It adopts a modular approach to design an AND logic signal terminal module that integrates terminals, cable plugs and internal wiring circuits. Through modular internal wiring design and the use of prefabricated cables to connect with DO boards, it can improve the efficiency and quality of design, assembly and maintenance, and significantly reduce the risk of human error.

[0028] 2. This utility model uses a DB25 female connector to connect to two different DO boards, and uses an internal PCB circuit board to connect the two sets of signals in series to achieve signal coupling. After signal coupling, each output is designed with an on / off switch, allowing manual disconnection of any output signal, and a protective cover is provided to protect the switch.

[0029] 3. This utility model designs two mirrored versions of the terminal module and configures a guide rail fixer to facilitate rack rail installation and cable laying.

[0030] 4. This utility model makes the terminal module structure compact and saves cabinet rail space by horizontally arranging two DB25 female heads on the top and bottom sides of the terminal module. Attached Figure Description

[0031] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0032] Figure 1 This is a schematic diagram illustrating the current signal coupling principle.

[0033] Figure 2 This is a schematic diagram of an integrated AND logic signal coupling terminal module according to a specific embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the internal connection method of the terminal module according to a specific embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the on / off switch of the terminal module in a specific embodiment of this utility model;

[0036] Figure 5 This is a schematic diagram of the switch protection cover and guide rail fixator in a specific embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the internal arrangement of the terminal module installed on the left side in a specific embodiment of this utility model.

[0038] The above figures include the following reference numerals:

[0039] 100. Terminal module; 11. PCB circuit board; 12. Double-layer terminal block; 13. On / off switch; 14. On / off switch protective cover; 15. Guide rail retainer; 16. DB25 female connector; 17. Prefabricated cable; 21. First DO board; 22. Second DO board. Detailed Implementation

[0040] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] The present invention will be further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention.

[0042] Example

[0043] To address the problems of high design complexity, large cabinet space occupation, and low overall efficiency in existing functional hardware implementation methods, which are detrimental to the design, manufacturing, and maintenance of DCS, this invention proposes an AND logic signal terminal module for nuclear-grade DCS. Based on the coupling requirements of the AND logic signals for dedicated safety facility drive functions, and combining a modular design concept, this invention centralizes distributed terminals and shorting wires for signal coupling into a single module, realizing the AND logic function of signals from two DO boards. This module can significantly reduce engineering design difficulty, overall assembly complexity, and subsequent operation and maintenance burden, while effectively saving cabinet space.

[0044] The two sets of DO signals output by the current dedicated safety facility drive control station are coupled using distributed terminals and jumpers to achieve an AND logic coupling function. Taking a specific dedicated safety facility drive function signal as an example, such as... Figure 1 The diagram shows the current signal coupling implementation principle. The specific implementation method is as follows: (1) The two DO contact type signals output by the controller are output through the relay output channels of DO board 1 and DO board 2 respectively. (2) The pins of the output channel of the DO board are connected to the input side of the distributed terminal in the form of scattered wires. (3) The output side of the two terminals is connected in series with the output of the two signals through additional jumper wires to realize the "AND" logic function of the signals before output.

[0045] This invention addresses the shortcomings of the aforementioned implementation by designing an integrated AND logic signal coupling terminal module. An AND logic signal terminal module for a core-level DCS is provided. The terminal module is connected to the output channel of a DO board and is used to perform AND operations on the output signals of the DO board. The terminal module includes: a PCB circuit board, double-layer wiring terminals, and two sets of DB25 female connectors. One side of each set of DB25 female connectors is connected to the output channel of a first DO board and the output channel of a second DO board, respectively. The other side of each set of DB25 female connectors is connected to the PCB circuit board. The PCB circuit board is connected to the double-layer wiring terminals.

[0046] In one embodiment of this utility model, the order of the pins of the two sets of DB25 female connectors and the order of the double-layer wiring terminals are consistent with the order of the corresponding DO board output channels.

[0047] Furthermore, the first DO board and the second DO board have the same number and arrangement order of output channels, and the same output channels of the first DO board and the second DO board are connected in series in the PCB circuit board.

[0048] In another embodiment of the present invention, the terminal module further includes an on / off switch, the two ends of which are respectively connected to the PCB circuit board and the double-layer wiring terminal.

[0049] Furthermore, the double-layer terminal block is provided with an external wiring port for connecting to an external cable.

[0050] In one specific embodiment of this utility model, the terminal module includes 16 on / off switches.

[0051] Furthermore, it also includes: a protective cover for the on / off switch.

[0052] In another embodiment of this utility model, the terminal modules are arranged in a mirror image, which facilitates the installation of the guide rails on the left and right sides of the cabinet.

[0053] Furthermore, the terminal module also includes a guide rail retainer for mounting the terminal module.

[0054] In another embodiment of this utility model, the two sets of DB25 female connectors are arranged laterally at the top and bottom of the terminal module, respectively.

[0055] Furthermore, the terminal module includes 8 sets of double-layer wiring terminals.

[0056] like Figure 2 The diagram shows a schematic of an integrated AND logic signal coupling terminal module according to a specific embodiment of the present invention. Figure 2As shown, the terminal module 100 is connected to the output channel of the DO board and is used to perform AND operations on the output signal of the DO board. The terminal module 100 includes: a PCB circuit board 11, a double-layer terminal block 12, an on / off switch 13, and two sets of DB25 female connectors 16. One side of each set of DB25 female connectors is connected to the output channel of the first DO board 21 and the output channel of the second DO board 22 respectively via prefabricated cables 17. The other side of each set of DB25 female connectors is connected to the PCB circuit board 11. The PCB circuit board 11 is connected to the double-layer terminal block 12 via the on / off switch 13. This solution can improve the efficiency and quality of design, assembly, and maintenance, and significantly reduce the risk of human error.

[0057] like Figure 3 The diagram shows the internal connection method of the terminal module, from Figure 3 As can be seen, the pin order of the two sets of DB25 female connectors and the double-layer terminal blocks 12 are consistent with the order of the corresponding DO board output channels. Specifically, the signals corresponding to terminals 1A and 1B are the CH1 channels of the two DO boards, the signals corresponding to terminals 2A and 2B are the CH2 channels of the two DO boards, and so on. The same channels of the two DO boards are connected in series on the PCB circuit board 11 of the terminal module, such as... Figure 3 The signal from the output channel CH1 of the first DO board 21 is transmitted to the DB25 female connector, and from pin 2 of the DB25 female connector to pin 1 of the second set of DB25 female connectors, corresponding to the output channel CH1 of the second DO board 22. The terminal module 100 includes 8 sets of double-layer wiring terminals 12, and the double-layer wiring terminals 12 are provided with external wiring ports for connecting to external cables.

[0058] like Figure 4 As shown, the two ends of the on / off switch 13 are respectively connected to the PCB circuit board and the double-layer terminal block. Further, in this embodiment, the terminal module 100 includes 16 miniature on / off switches, allowing manual disconnection of any output signal, enabling individual on / off functionality for each signal, facilitating signal isolation and maintenance. To prevent accidental operation of the on / off switches, this embodiment also designs a dedicated on / off switch protection cover 14 to protect the on / off switches 13 of each channel of the terminal module, as shown in the specific schematic diagram. Figure 5 As shown.

[0059] In addition, to facilitate the fixed installation of the terminal module via the guide rail, the terminal module 100 is equipped with a dedicated guide rail retainer 15. For example... Figure 6 As shown, the terminal modules are arranged in a mirror image to facilitate the installation of the guide rails on the left and right sides of the cabinet.

[0060] Furthermore, the two sets of DB25 female connectors are arranged laterally at the top and bottom of the terminal module, making the terminal module structure compact and reducing the guide rail space occupied by the terminal module.

[0061] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0062] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0063] In summary, as can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0064] 1. The terminal module proposed in this utility model includes two sets of DB25 female connectors, a PCB circuit board and double-layer wiring terminals. It adopts a modular approach to design an AND logic signal terminal module that integrates terminals, cable plugs and internal wiring circuits. Through modular internal wiring design and the use of prefabricated cables to connect with DO boards, it can improve the efficiency and quality of design, assembly and maintenance, and significantly reduce the risk of human error.

[0065] 2. This utility model uses a DB25 female connector to connect to two different DO boards, and uses an internal PCB circuit board to connect the two sets of signals in series to achieve signal coupling. After signal coupling, each output is designed with an on / off switch, allowing manual disconnection of any output signal, and a protective cover is provided to protect the switch.

[0066] 3. This utility model designs two mirrored versions of the terminal module and configures a guide rail fixer to facilitate rack rail installation and cable laying.

[0067] 4. This utility model makes the terminal module structure compact and saves cabinet rail space by horizontally arranging two DB25 female heads on the top and bottom sides of the terminal module.

[0068] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0069] It should be noted that, in the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. An AND logic signal terminal module for a core-level DCS, characterized in that, The terminal module is connected to the output channel of the DO board and is used to perform AND operations on the output signal of the DO board. The terminal module includes: a PCB circuit board, double-layer terminal blocks, and two sets of DB25 female connectors. One side of each of the two sets of DB25 female connectors is connected to the output channel of the first DO board and the output channel of the second DO board, respectively, and the other side of each of the two sets of DB25 female connectors is connected to the PCB circuit board. The PCB circuit board is connected to the double-layer terminal block.

2. The module according to claim 1, characterized in that, The order of the pins of the two sets of DB25 female connectors and the double-layer terminal blocks is consistent with the order of the corresponding DO board output channels.

3. The module according to claim 2, characterized in that, The first DO board and the second DO board have the same number of output channels and the same arrangement order. The same output channels of the first DO board and the second DO board are connected in series in the PCB circuit board.

4. The module according to claim 1, characterized in that, Also includes: An on / off switch, the two ends of which are respectively connected to the PCB circuit board and the double-layer terminal block.

5. The module according to claim 1, characterized in that, The double-layer terminal block is provided with an external wiring port for connecting to an external cable.

6. The module according to claim 1, characterized in that, The terminal modules are arranged in a mirror image, which facilitates installation on the left and right side rails of the cabinet.

7. The module according to claim 6, characterized in that, Also includes: Rail retainer for mounting the terminal module.

8. The module according to any one of claims 1 to 7, characterized in that, The arrangement direction of the two sets of DB25 female connectors is perpendicular to the arrangement direction of the double-layer terminal blocks.

9. The module according to claim 8, characterized in that, The terminal module includes 8 sets of double-layer wiring terminals.

10. The module according to claim 4, characterized in that, The terminal module includes 16 on / off switches.

11. The module according to claim 10, characterized in that, Also includes: On / off switch protective cover.

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