Signal switching substrate and signal switching device

Abstract

The utility model relates to a signal switching substrate and a signal switching device. The signal transfer substrate comprises a substrate body, and a signal input and output loop module, a signal line interface module and a signal series loop module which are arranged on the substrate body, wherein the signal line interface module is connected with the signal input and output loop module and comprises a plurality of wiring units; the signal series connection loop module comprises a plurality of series connection wiring units in one-to-one correspondence with the plurality of wiring units, and a preset number of series connection wiring units in the plurality of series connection wiring units are sequentially connected to form a series connection structure. The signal switching substrate can improve the wiring efficiency and reduce the wiring difficulty.

Description

Technical Field

[0001] The present application relates to the technical field of automation equipment, and in particular to a signal switching substrate and a signal switching device. Background Art

[0002] As people have higher and higher requirements for the safety and reliability of automation equipment, the safety protection of automation equipment has become more and more important. The safety protection circuit of traditional automation equipment is wired by operators according to the installation position of each safety protection device and connected with various control wires required.

[0003] At present, when operators wire the emergency stop button, they need to make various wires on site, which results in low wiring efficiency, high wiring error rate, and difficult to find wiring faults. Wiring errors can easily damage the emergency stop button, thereby increasing the manufacturing cost of the equipment, affecting the safe and stable operation of the equipment, and endangering personal safety. Utility Model Content

[0004] Based on this, the embodiments of the present application provide a signal switching substrate and a signal switching device, which can improve the wiring efficiency of the emergency stop button and reduce the wiring difficulty.

[0005] According to some embodiments, the present application provides a signal transfer substrate, including a substrate body and a signal input and output circuit module, a signal line interface module and a signal series circuit module arranged on the substrate body; wherein,

[0006] The signal line interface module is connected to the signal input and output circuit module and includes a plurality of wiring units;

[0007] The signal series circuit module includes a plurality of series wiring units corresponding one-to-one to the plurality of wiring units, and a preset number of the series wiring units among the plurality of series wiring units are connected in sequence to form a series structure.

[0008] In some embodiments, the signal transfer substrate further includes a signal transfer module;

[0009] The signal transfer module is connected to an external programmable logic controller and a safety key, and transmits a programmable logic controller signal generated by the programmable logic controller to the safety key;

[0010] The signal transfer module and the signal input-output loop module are arranged side by side and are spaced apart and distributed on the same side of the signal line interface module and the signal series loop module.

[0011] In some embodiments, each of the wiring units and the corresponding series wiring unit are integrated into the same submodule, and the submodules are distributed in an array.

[0012] In some embodiments, the signal transfer module includes a signal transfer input circuit module and a signal transfer output circuit module connected to the signal transfer input circuit module; the signal transfer input circuit module and the signal transfer output circuit module are arranged side by side and spaced apart;

[0013] The signal transfer input circuit module is used to connect with the programmable logic controller and receive the programmable logic controller signal;

[0014] The signal relay output circuit module is used to connect with the safety key, obtain the programmable logic controller signal, and transmit the programmable logic controller signal to the safety key.

[0015] In some embodiments, the signal transfer substrate further includes:

[0016] The power input safety protection circuit module is used to connect to the power supply and cut off the connection with the power supply when it is detected that the positive and negative poles of the power supply are reversely connected.

[0017] In some embodiments, the signal transfer substrate further includes:

[0018] A control signal input loop module connected to the input end of the series structure;

[0019] The control signal output loop module is connected to the output end of the series structure.

[0020] In some embodiments, the power input safety protection circuit module, the control signal input circuit module and the control signal output circuit module are integrated into the same module;

[0021] The signal input and output loop module, the signal transfer module and the same module are arranged side by side and spaced apart on the same side of each of the sub-modules.

[0022] According to some embodiments, the present application further provides a signal switching device, including the signal switching substrate as described in some of the aforementioned embodiments.

[0023] In some embodiments, the signal transfer substrate further includes a power input safety protection circuit module, which is used to connect to a power source and cut off the connection with the power source when it is detected that the positive and negative poles of the power source are reversely connected;

[0024] The signal switching device further comprises:

[0025] A first indicator light is connected to the power input safety protection circuit module; the first indicator light lights up when the power input safety protection circuit module detects that the positive and negative poles of the power supply are correctly connected.

[0026] In some embodiments, the signal switching device further comprises a programmable logic controller;

[0027] The signal transfer substrate further includes a signal transfer module; the signal transfer module is connected to the programmable logic controller and the safety key, and transmits the programmable logic controller signal generated by the programmable logic controller to the safety key;

[0028] The programmable logic controller is also connected to the input end of the series structure;

[0029] The signal switching device also includes a second indicator light and a third indicator light;

[0030] The signal transfer substrate further includes a control signal input loop module and a control signal output loop module; the control signal input loop module is connected to the input end of the series structure; the control signal output loop module is connected to the output end of the series structure;

[0031] The second indicator light is connected to the control signal input circuit module and is used to light up when the control signal input circuit module detects that the programmable logic controller signal input to the series structure is normal;

[0032] The third indicator light is connected to the control signal output circuit module, and is configured to light up when the control signal output circuit module detects that the output signal of the series structure is normal.

[0033] The signal transfer substrate and the signal transfer device provided by the present application can / at least have the following unexpected beneficial effects:

[0034] In the signal transfer substrate provided in the embodiment of the present application, a signal line interface module and a signal series loop module are provided on the substrate body, and the multiple wiring units in the signal line interface module can be connected one-to-one with the multiple series wiring units in the signal series loop module; by sequentially connecting a preset number of series wiring units in the multiple series wiring units to form a series structure, such a wiring method does not require manual wiring by the operator, which is beneficial to improving the operator's wiring efficiency and reducing the difficulty of wiring. In addition, the use of the above-mentioned signal transfer substrate for wiring work can also avoid problems such as wiring faults that are difficult to find and damage to automation equipment due to wiring errors, which is beneficial to ensuring the stable operation of automation equipment and improving the reliability of the use of automation equipment. The above-mentioned signal transfer substrate has a simple structure and is easy to use, so it also has high practicality.

[0035] The signal switching device provided in the embodiment of the present application includes the aforementioned signal switching substrate, so the technical effects that can be achieved by the aforementioned signal switching substrate can also be achieved by the signal switching device, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A schematic diagram of application scenarios of the signal transfer substrate provided in some embodiments of the present application;

[0038] Figure 2 A schematic diagram of the structure of a signal transfer substrate provided in some embodiments of the present application;

[0039] Figure 3 A schematic diagram of a structure in which a signal transfer substrate provided in some embodiments of the present application is connected to six emergency stop buttons;

[0040] Figure 4 A connection block diagram of a power input safety protection circuit module in a signal transfer substrate provided in some embodiments of the present application;

[0041] Figure 5 A connection block diagram of a control signal input loop module in a signal transfer substrate provided in some embodiments of the present application;

[0042] Figure 6 A connection block diagram of a control signal output loop module in a signal transfer substrate provided in some embodiments of the present application;

[0043] Figure 7 A schematic diagram of the structure of a signal switching device provided in some embodiments of the present application.

[0044] Description of reference numerals:

[0045] 10. Signal transfer substrate; 11. Substrate body; 12. Signal input and output circuit module; 13. Submodule; 14. Signal transfer module; 141. Signal transfer input circuit module; 142. Signal transfer output circuit module; 15A. Power input safety protection circuit module; 15B. Control signal input circuit module; 15C. Control signal output circuit module; 20. Emergency stop button; 30. Programmable logic controller; 30', safety programmable logic controller; 40. Power supply; 50. First indicator light; 60. Second indicator light; 70. Third indicator light. DETAILED DESCRIPTION

[0046] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0048] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first indicator light may be referred to as a second indicator light, and similarly, a second indicator light may be referred to as a first indicator light. Both the first indicator light and the second indicator light are indicator lights, but they are not the same indicator light.

[0049] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0050] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0051] At present, when operators wire the emergency stop button, they need to make various wires on site, which results in low wiring efficiency, high wiring error rate, and difficult to find wiring faults. Wiring errors can easily damage the emergency stop button, thereby increasing the manufacturing cost of the equipment, affecting the safe and stable operation of the equipment, and endangering personal safety.

[0052] Based on this, the embodiments of the present application provide a signal switching substrate and a signal switching device, the details of which will be described in subsequent embodiments.

[0053] According to some embodiments, the present application provides a signal transfer substrate 10 , including a substrate body 11 , and a signal input / output loop module 12 , a signal line interface module, and a signal series loop module 15 disposed on the substrate body 11 .

[0054] Among them, the signal line interface module is connected to the signal input and output circuit module 12 and includes multiple wiring units; the signal series circuit module can include multiple series wiring units corresponding to the multiple wiring units one by one, and a preset number of series wiring units in the multiple series wiring units are connected in sequence to form a series structure.

[0055] In the signal transfer substrate 10 provided in the above embodiment, a signal line interface module and a signal series loop module are provided on the substrate body 11, and the multiple wiring units in the signal line interface module can be connected to multiple emergency stop buttons 20, and are connected one-to-one with the multiple series wiring units in the signal series loop module; by sequentially connecting a preset number of series wiring units in the multiple series wiring units to form a series structure, such a wiring method does not require manual wiring by the operator, which is beneficial to improving the wiring efficiency of the operator and reducing the difficulty of wiring. In addition, the use of the above-mentioned signal transfer substrate 10 for wiring work can also avoid problems such as wiring faults that are difficult to find and damage to automation equipment due to wiring errors, which is beneficial to ensuring the stable operation of automation equipment and improving the reliability of the use of automation equipment. The above-mentioned signal transfer substrate 10 has a simple structure and is easy to use, so it also has high practicality.

[0056] In some embodiments, please combine Figure 1 See also Figure 2 The signal transfer substrate 10 may further include a signal transfer module 14 .

[0057] The signal transfer module 14 can be used to connect with an external programmable logic controller (PLC) 30 and a safety key, and transmit a programmable logic controller signal generated by the programmable logic controller 30 to the safety key.

[0058] In some embodiments, the signal transfer substrate 10 can be applied to an emergency stop button 20. As an example, Figure 1 As shown, the signal transfer substrate 10 can be used to connect eight emergency stop buttons (emergency stop button 1 to emergency stop button 8).

[0059] Please combine Figure 2It is understood that the signal input-output circuit module 12 can be used to obtain an emergency stop test signal. The signal line interface module is connected to the signal input-output circuit module 12, and can be used to receive the emergency stop test signal input by the signal input-output circuit module 12. The signal line interface module may include a plurality of wiring units, each wiring unit is connected to an emergency stop button 20. The signal series circuit module may include a plurality of series wiring units corresponding to the plurality of wiring units one by one, and a preset number of series wiring units in the plurality of series wiring units are connected in sequence to form a series structure.

[0060] In the signal transfer substrate 10 provided in the above embodiment, the signal input / output loop module 12 and the signal transfer module 14 are arranged side by side and spaced apart on the same side of the signal line interface module and the signal series loop module.

[0061] In the signal transfer substrate 10 provided in the above embodiment, the multiple wiring units in the signal line interface module can be connected to multiple emergency stop buttons 20, and are connected one by one with the multiple series wiring units in the signal series loop module; by connecting a preset number of series wiring units in the multiple series wiring units in sequence to form a series structure, the series connection of multiple emergency stop buttons 20 can be achieved. In this way, there is no need for operators to manually wire, which is conducive to improving the wiring efficiency of operators and reducing the difficulty of wiring. In addition, the use of the above-mentioned signal transfer substrate 10 for wiring multiple emergency stop buttons 20 can also avoid problems such as wiring faults that are difficult to find and damage to the emergency stop button 20 due to wiring errors, which is conducive to ensuring the stable operation of the emergency stop button 20 and improving the reliability of the use of the emergency stop button 20. A signal transfer module 14 is also provided on the substrate body 11, which can transfer the programmable logic controller 30 signal generated by the programmable logic controller 30 to the safety key without the need for additional wiring, thereby further reducing wiring errors. The above-mentioned signal transfer substrate 10 has a simple structure and is easy to use, so it also has high practicality.

[0062] It can be understood that in the signal transfer substrate 10 provided in the above embodiment, the external programmable logic controller 30 can generate a programmable logic controller signal for input to the emergency stop button 20; the programmable logic controller 30 can also be called a control PLC.

[0063] In the above-mentioned signal transfer substrate 10, the emergency stop test signal can be used to detect whether the multiple emergency stop buttons 20 connected to the series structure are pressed. As an example, the series structure can be connected to an external safety programmable logic controller 30'. When an emergency stop button 20 in the series structure is pressed, the safety programmable logic controller 30' cannot receive the emergency stop test signal, that is: the safety programmable logic controller 30' and the series structure cannot form an electrical circuit for the emergency stop test signal to flow. The safety programmable logic controller 30' can also be called a safety PLC.

[0064] As an example, each emergency stop button 20 may include at least two pairs of contacts. When an emergency stop button 20 in the series structure is pressed, one pair of contacts in the emergency stop button 20 can be used to cut off the operation of the automation equipment that needs to be stopped, and the other pair of contacts can be connected to the programmable logic controller 30 to control the programmable logic controller 30 to cut off the starting circuit of the automation equipment controlled by it.

[0065] In some embodiments, please refer to Figure 2 Each wiring unit and the corresponding series wiring unit can be integrated into the same submodule 13, and the submodules 13 are distributed in an array.

[0066] In the signal transfer substrate 10 provided in the above embodiment, each wiring unit and the corresponding series wiring unit are integrated into the same sub-module 13, and the sub-modules 13 are distributed in an array; this is beneficial to saving space in the signal transfer substrate 10, making the layout of each module more compact, thereby reducing the volume of the signal transfer substrate 10.

[0067] In some embodiments, please refer to Figure 2 The signal transfer module 14 includes a signal transfer input circuit module 141 and a signal transfer output circuit module 142 connected to the signal transfer input circuit module 141. The signal transfer input circuit module 141 and the signal transfer output circuit module 142 can be arranged side by side and spaced apart;

[0068] In the signal transfer substrate 10 provided in the above embodiment, the signal transfer input circuit module 141 can be connected to the programmable logic controller 30 and receive the programmable logic controller signal; the signal transfer output circuit module 142 can be connected to the safety key, obtain the programmable logic controller 30 signal, and transmit the programmable logic controller signal to the safety key.

[0069] Please combine the following Figure 3 Understand, in Figure 3 The signal transfer substrate 10 shown includes 8 serial wiring units, so the signal line interface module also has 8 wiring units corresponding to the 8 serial wiring units, and each wiring unit can be connected to an emergency stop button 20. Therefore, the signal transfer substrate 10 can be connected in series with 2 to 8 emergency stop buttons 20.

[0070] As an example, when there are 6 emergency stop buttons 20 on the automation device, a simple jumper can be performed on the wiring terminals of the remaining series wiring units to complete the series connection of the 6 emergency stop buttons 20, such as Figure 3 The jumper arrangement of six emergency stop buttons 20 is shown.

[0071] As an example, Figure 2As shown, the signal input and output circuit module 12 may include an input terminal IN and an output terminal OUT. Exemplarily, the input terminal IN may include two sub-input terminals T0 and T1, and the output terminal OUT may include two sub-output terminals Si0 and Si1. The above numbers are only examples, and in actual embodiments, the number of sub-input terminals in the input terminal IN and the number of sub-output terminals in the output terminal OUT are not limited to the above numbers.

[0072] See also Figure 4 In some embodiments, the signal transfer substrate 10 may further include a power input safety protection circuit module 15A.

[0073] The power input safety protection circuit module 15A can be connected to the power supply 40, and cut off the connection with the power supply 40 when the positive and negative poles of the power supply 40 are detected to be reversely connected. Setting the power input safety protection circuit module 15A can effectively protect the emergency stop button 20 in the automation equipment from being damaged due to the reverse connection of the positive and negative poles of the power supply 40, thereby improving the reliability of the emergency stop button 20.

[0074] See also Figure 5 In some embodiments, the signal transfer substrate 10 may further include a control signal input loop module 15B.

[0075] The control signal input loop module 15B can be connected to the input end of the series structure, and is used to detect whether the programmable logic controller signal input from the programmable logic controller 30 to the series structure is normal when multiple emergency stop buttons 20 in the series structure are closed.

[0076] See also Figure 6 In some embodiments, the signal transfer substrate 10 may further include a control signal output loop module 15C.

[0077] The control signal output circuit module 15C can be connected to the output end of the series structure to detect whether the output signal of the series structure is normal when the multiple emergency stop buttons 20 in the series structure are closed.

[0078] Please continue reading Figure 2 In some embodiments, the power input safety protection circuit module 15A, the control signal input circuit module 15B and the control signal output circuit module 15C can be integrated into the same module. This is beneficial to further reduce the volume of the signal transfer substrate 10.

[0079] As an example, the signal input / output loop module 12, the signal transfer module 14 and the aforementioned same module can be arranged side by side and spaced apart on the same side of each submodule 13. In this way, the layout of each module can be made more compact, thereby further reducing the volume of the signal transfer substrate 10.

[0080] According to some embodiments, the present application also provides a signal switching device, which may include the signal switching substrate 10 provided in some of the aforementioned embodiments.

[0081] The signal switching device provided in the above embodiment includes the aforementioned signal switching substrate 10, so the technical effects that can be achieved by the aforementioned signal switching substrate 10 can also be achieved by the signal switching device, which will not be described in detail here.

[0082] It can be understood that the signal switching device in the embodiment of the present application includes the aforementioned signal switching substrate 10, so the technical features between the signal switching substrate embodiment and the signal switching device embodiment can be replaced and supplemented with each other without causing conflicts, so that technical personnel in this field can understand the technical content of the present application.

[0083] In some embodiments, the signal switching device may further include a programmable logic controller 30 .

[0084] In the above embodiment, the signal transfer module 14 in the signal transfer substrate 10 can be connected to the programmable logic controller 30 and the safety key, and transmit the programmable logic controller signal generated by the programmable logic controller 30 to the safety key.

[0085] The embodiment of the present application does not specifically limit the form of the signal transfer substrate 10. As an example, the signal transfer substrate 10 may be a printed circuit board (PCB) or a flexible printed circuit board (FPCB).

[0086] Exemplarily, a printed circuit board is used as the signal transfer substrate 10. Due to the consistency of similar printed circuit boards, errors in manual wiring are avoided, and automatic insertion or mounting, automatic soldering, and automatic detection of electronic components can be realized, thereby ensuring the quality of the signal transfer substrate 10, improving labor productivity, reducing costs, reducing pollution, and facilitating maintenance. At the same time, the volume of the signal transfer substrate 10 is reduced, costs are reduced, and performance is improved.

[0087] Exemplarily, a flexible printed circuit board is used as the signal transfer substrate 10, which has the characteristics of continuous automated production, high wiring density, light weight, small size, few wiring errors, flexibility and elastic shape change.

[0088] In some embodiments, see Figure 7 The signal switching device may include a plurality of signal switching substrates 10, and the plurality of signal switching substrates 10 are connected in series in sequence.

[0089] Exemplarily, among any two adjacent signal switching substrates 10 on the signal switching device, the output terminal OUT of the adjacent upper signal switching substrate 10 is connected to the input terminal IN of the next signal switching substrate 10 . Figure 7 The figure shows an extended form in which the signal transfer device includes two serially connected signal transfer substrates 10. It can be understood that when the number of emergency stop buttons 20 is greater than 8 or more, a combination of multiple signal transfer substrates 10 is required.

[0090] Please continue reading Figure 4 In some embodiments, the signal switching device may further include a first indicator light 50 .

[0091] The first indicator light 50 is connected to the power input safety protection circuit module 15A, and may light up when the power input safety protection circuit module 15A detects that the positive and negative poles of the power supply 40 are correctly connected.

[0092] With the signal transfer device provided in the above embodiment, when the positive and negative poles of the power supply 40 are connected reversely, the first indicator light 50 is off, indicating that the power supply 40 is connected incorrectly, and the power input safety protection circuit module 15A cuts off the connection with the power supply 40. When the positive and negative poles of the power supply 40 are connected correctly, the first indicator light 50 is on, and the power input safety protection circuit module 15A is in a normal conduction state, and the power supply 40 supplies power to the emergency stop button 20 via various control circuits.

[0093] Please continue reading Figure 5 In some embodiments, the signal switching device may further include a second indicator light 60 .

[0094] The programmable logic controller 30 can also be connected to the input end of the series structure, and the second indicator light 60 can be connected to the control signal input circuit module 15B. The second indicator light 60 lights up when the control signal input circuit module 15B detects that the signal input to the programmable logic controller of the series structure is normal.

[0095] Exemplarily, when the control signal input circuit module 15B detects that the signal input to the programmable logic controller of the series structure is disconnected, the second indicator light 60 is turned off.

[0096] Please continue reading Figure 6 In some embodiments, the signal switching device may further include a third indicator light 70 .

[0097] The third indicator light 70 may be connected to the control signal output circuit module 15C, and may light up when the control signal output circuit module 15C detects that the output signal of the series structure is normal.

[0098] Exemplarily, when the control signal output circuit module 15C detects that the output signal of the series structure is disconnected, the third indicator light 70 is turned off.

[0099] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0100] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0101] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A signal transfer substrate, characterized in that: It includes a substrate body and a signal input and output circuit module, a signal line interface module and a signal series circuit module arranged on the substrate body; wherein, The signal line interface module is connected to the signal input and output circuit module and includes a plurality of wiring units; The signal series circuit module includes a plurality of series wiring units corresponding one-to-one to the plurality of wiring units, and a preset number of the series wiring units among the plurality of series wiring units are connected in sequence to form a series structure.

2. The signal transfer substrate according to claim 1, characterized in that: It also includes a signal relay module; The signal transfer module is connected to an external programmable logic controller and a safety key, and transmits a programmable logic controller signal generated by the programmable logic controller to the safety key; The signal transfer module and the signal input-output loop module are arranged side by side and are spaced apart and distributed on the same side of the signal line interface module and the signal series loop module.

3. The signal transfer substrate according to claim 1, characterized in that: Each of the wiring units and the corresponding series wiring unit are integrated into the same submodule, and the submodules are distributed in an array.

4. The signal transfer substrate according to claim 2, characterized in that: The signal transfer module includes a signal transfer input circuit module and a signal transfer output circuit module connected to the signal transfer input circuit module; the signal transfer input circuit module and the signal transfer output circuit module are arranged side by side and spaced apart; The signal transfer input circuit module is used to connect with the programmable logic controller and receive the programmable logic controller signal; The signal relay output circuit module is used to connect with the safety key, obtain the programmable logic controller signal, and transmit the programmable logic controller signal to the safety key.

5. The signal transfer substrate according to claim 1, characterized in that: Also includes: The power input safety protection circuit module is used to connect to the power supply and cut off the connection with the power supply when it is detected that the positive and negative poles of the power supply are reversely connected.

6. The signal transfer substrate according to claim 2, characterized in that: Also includes: A control signal input loop module connected to the input end of the series structure; The control signal output loop module is connected to the output end of the series structure.

7. The signal transfer substrate according to claim 6, characterized in that: Also includes: A power input safety protection circuit module, used to connect to a power source and cut off the connection with the power source when detecting that the positive and negative poles of the power source are reversely connected; Among them, the power input safety protection circuit module, the control signal input circuit module and the control signal output circuit module are integrated into the same module; each of the wiring units and the corresponding series wiring unit are integrated into the same sub-module, and the sub-modules are distributed in an array; the signal input and output circuit module, the signal transfer module and the same module are distributed side by side and at intervals on the same side of each of the sub-modules.

8. A signal switching device, characterized in that: It comprises the signal transfer substrate as claimed in any one of claims 1 to 7.

9. The signal switching device according to claim 8, characterized in that: The signal transfer substrate also includes a power input safety protection circuit module, which is used to connect to the power supply and cut off the connection with the power supply when the positive and negative poles of the power supply are detected to be reversely connected; The signal switching device further comprises: A first indicator light is connected to the power input safety protection circuit module; the first indicator light lights up when the power input safety protection circuit module detects that the positive and negative poles of the power supply are correctly connected.

10. The signal switching device according to claim 9, characterized in that: Also included are programmable logic controllers; The signal transfer substrate further includes a signal transfer module; the signal transfer module is connected to the programmable logic controller and the safety key, and transmits the programmable logic controller signal generated by the programmable logic controller to the safety key; The programmable logic controller is also connected to the input end of the series structure; The signal switching device also includes a second indicator light and a third indicator light; The signal transfer substrate further includes a control signal input loop module and a control signal output loop module; the control signal input loop module is connected to the input end of the series structure; the control signal output loop module is connected to the output end of the series structure; The second indicator light is connected to the control signal input circuit module and is used to light up when the control signal input circuit module detects that the programmable logic controller signal input to the series structure is normal; The third indicator light is connected to the control signal output circuit module, and is configured to light up when the control signal output circuit module detects that the output signal of the series structure is normal.

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