CN114743830B - Signal switching circuit, method and system based on relay logic - Google Patents
Signal switching circuit, method and system based on relay logic Download PDFInfo
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- CN114743830B CN114743830B CN202210280989.0A CN202210280989A CN114743830B CN 114743830 B CN114743830 B CN 114743830B CN 202210280989 A CN202210280989 A CN 202210280989A CN 114743830 B CN114743830 B CN 114743830B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 claims description 17
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/001—Functional circuits, e.g. logic, sequencing, interlocking circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
- H01H47/004—Monitoring or fail-safe circuits using plural redundant serial connected relay operated contacts in controlled circuit
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- Safety Devices In Control Systems (AREA)
Abstract
The application relates to a signal switching circuit, a method and a system based on relay logic, wherein the signal switching circuit comprises a first relay and a second relay, and the first relay is connected with first control signal transmitting equipment and the second relay; the first control signal generating device is used for receiving a first control signal sent by the first control signal generating device; the second relay is connected with second control signal transmitting equipment and safety code signal transmitting equipment; the device is used for disconnecting the safety code signal transmitting device after being electrified and receiving a second control signal transmitted by the second control signal transmitting device; the second relay is also used for receiving the safety code signal sent by the safety code signal sending device after power failure. The signal switching circuit can realize that the first control signal, the second control signal and the third control signal are respectively and independently output, and the signal switching method and the system have the same beneficial effects based on the same principle.
Description
Technical Field
The application belongs to the field of electronic circuits, and particularly relates to a signal switching circuit, a method and a system based on relay logic.
Background
In the railway communication field, the signal code sending equipment of the control train is generally set to be a main system and a standby system with hot standby redundancy, so that when the main system and the standby system are switched (for example, the main system fails), the main system and the standby system can be timely switched to the standby system to control the operation of the train, and the safety problem is avoided.
In order to realize the seamless switching between the main system and the standby system, the normal control signal output of the main system and the standby system needs to be ensured, when the main system works, only the main system control signal is output, and when the standby system rises the main system, the switching is changed into only the standby system control signal; and when the main system and the standby system are out of operation at the same time, a path of safety code signal is required to be output for early warning.
Therefore, a signal switching output circuit is required to be designed to realize the mutual isolation output of the three signals, namely the main system control signal, the standby system control signal and the safety code signal, namely the switching output of the main system control signal and the standby system control signal can be realized when the main system and the standby system are switched; when the main system and the standby system cannot work normally, the independent output of the safety code signal is ensured.
Disclosure of Invention
The application provides a signal switching circuit, a signal switching method and a signal switching system based on relay logic.
The application discloses a signal switching circuit based on relay logic, which comprises a first relay and a second relay,
the first relay is connected with a first control signal transmitting device and the second relay; the first control signal transmitting device is used for connecting the first relay with the second relay after the first relay is electrified, and receiving a first control signal transmitted by the first control signal transmitting device;
the second relay is connected with second control signal transmitting equipment and safety code signal transmitting equipment; the control device is used for disconnecting the safety code signal transmitting device after being electrified and receiving a second control signal transmitted by the second control signal transmitting device;
the second relay is also used for receiving the safety code signal sent by the safety code signal sending device after power failure.
Further, the first relay comprises a first normally closed node, a second normally closed node, a first normally open node and a second normally open node;
the first normally closed node is connected with the first normally open node;
the second normally closed node is connected with the second normally open node;
the first normally open node is used for connecting the first control signal transmitting equipment;
the second normally open node is used for connecting the first control signal transmitting device.
Further, the first relay further includes a fifth normally-on node for outputting the first control signal when the first relay is energized.
Further, the first relay further comprises a sixth normally open node, wherein the sixth normally open node is a detection end of the first relay, and whether the first relay is electrified is detected by receiving a detection signal.
Further, the second relay comprises a third normally closed node, a fourth normally closed node, a third normally open node and a fourth normally open node;
the third normally-closed node is connected with the first normally-closed node;
the fourth normally-closed node is connected with the second normally-closed node;
the third normally open node is used for connecting the second control signal transmitting equipment;
the fourth normally open node is used for connecting the second control signal transmitting device.
Further, the method comprises the steps of,
the third normally closed node is used for connecting the safety code signal transmitting equipment;
and the fourth normally closed node is used for connecting the safety code signal transmitting equipment.
Further, the second relay further includes a seventh normally open node for outputting the second control signal.
Further, the second relay further comprises an eighth normally open node, wherein the eighth normally open node is a detection end of the second relay, and whether the second relay is electrified is detected by receiving a detection signal.
Further, the first control signal transmitting device is a main code transmitting board; the second control signal sending equipment is a standby code board; the standby code plate and the main code plate are mutually isolated.
The application also discloses a signal switching method of the signal switching circuit based on the relay logic, which comprises the following steps:
the first relay receives and outputs the first control signal when being electrified;
when the first relay is powered off and the second relay is powered on, the second relay receives the second control signal and outputs the second control signal;
and when the first relay and the second relay are both powered off, the second relay receives the safety code signal and outputs the safety code signal.
The application also discloses a signal switching system based on the relay logic, which comprises a first control signal transmitting device, a second control signal transmitting device, a safety code signal transmitting device, a first relay and a second relay;
the first control signal transmitting device is connected with the first relay and transmits a first control signal to the first relay;
the second control signal transmitting device is connected with the second relay and transmits a second control signal to the second relay;
the safety code signal transmitting device is connected with the second relay and transmits a safety code signal to the second relay;
the second relay receives the second control signal after being electrified and outputs the second control signal; the second relay receives the safety code signal after power is off;
the first relay is disconnected from the second relay after being electrified, and receives the first control signal.
The application relates to a signal switching circuit, a method and a system based on relay logic, wherein the signal switching circuit comprises a first relay and a second relay, and the first relay is connected with first control signal transmitting equipment and the second relay; the first control signal transmitting device is used for connecting the first relay with the second relay after the first relay is powered on and receiving a first control signal transmitted by the first control signal transmitting device; the second relay is connected with second control signal transmitting equipment and safety code signal transmitting equipment; the device is used for disconnecting the safety code signal transmitting device after being electrified and receiving a second control signal transmitted by the second control signal transmitting device; the second relay is also used for receiving the safety code signal sent by the safety code signal sending device after power failure. The signal switching circuit can realize that the first control signal, the second control signal and the third control signal are respectively and independently output.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 illustrates a schematic diagram of a relay logic based signal switching circuit in accordance with an embodiment of the present application;
fig. 2 shows a relay logic based signal switching circuit according to an embodiment of the application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in fig. 1, a signal switching circuit based on relay logic according to an embodiment of the present application includes a first relay and a second relay;
fig. 1 is a schematic diagram of a signal switching circuit based on relay logic according to an embodiment of the present application, referring to fig. 1, a first relay includes a first normally-closed node 1 (including an upper pin 11 and a lower pin 12), a second normally-closed node 2 (including an upper pin 21 and a lower pin 22), a first normally-open node 5 (including an upper pin 54 and a lower pin 53), and a second normally-open node 6 (including an upper pin 64 and a lower pin 63); the lower pin 53 of the first normally open node 5 and the lower pin 63 of the second normally open node 6 are respectively used as the positive electrode end and the negative electrode end of the first control signal input;
the upper pin 54 of the first normally open node 5 and the upper pin 64 of the second normally open node 6 serve as the positive electrode and the negative electrode of the signal output end respectively;
the upper pin 54 of the first normally-open node 5 is communicated with the lower pin 12 of the first normally-closed node 1, and the upper pin 64 of the second normally-open node 6 is communicated with the lower pin 22 of the second normally-closed node 2;
the second relay comprises a third normally closed node 7 (comprising an upper pin 71 and a lower pin 72), a fourth normally closed node 8 (comprising an upper pin 81 and a lower pin 82), a third normally open node 11 (comprising an upper pin 114 and a lower pin 113) and a fourth normally open node 12 (comprising an upper pin 124 and a lower pin 123); the lower pin 113 of the third normally open node 11 and the lower pin 123 of the fourth normally open node 12 are respectively used as the positive terminal and the negative terminal of the second control signal input;
the lower pin 72 of the third normally closed node 7 and the lower pin 82 of the fourth normally closed node 8 are respectively used as the positive electrode end and the negative electrode end of the safety code signal input;
the upper pin 114 of the third normally open node 11 is communicated with the upper pin 71 of the third normally closed node 7; the upper pin 124 of the fourth normally open node 12 is communicated with the upper pin 81 of the fourth normally closed node 8;
the upper pin 11 of the first normally-closed node 1 and the upper pin 71 of the third normally-closed node 7 are communicated, and the upper pin 21 of the second normally-closed node 2 and the upper pin 81 of the fourth normally-closed node 8 are communicated.
When the relay logic-based signal switching circuit is applied to signal switching output, the relay logic-based signal switching circuit comprises:
1) When the first relay and the second relay work normally, the first relay and the second relay are electrified, and only the first control signal can be ensured to be output at the moment, and the second control signal or the safety code signal cannot be output. Specifically:
when the first relay works normally, the first normally open node 5 is closed after being electrified, the second normally open node 6 is closed, the first normally closed node 1 is opened, and the second normally closed node 2 is opened;
when the second relay works normally, the third normally open node 11 is closed after being electrified, the fourth normally open node 12 is closed, the third normally closed node 7 is opened, and the fourth normally closed node 8 is opened;
at this time, the first relay may normally receive the first control signal, and the first control signal may be normally output from the upper pin 54 of the first normally open node 5 and the upper pin 64 of the second normally open node 6; since the first normally-closed node 1 and the second normally-closed node 2 are both in the open state, the security code signals input from the third normally-closed node 7 and the fourth normally-closed node 8 cannot be normally output, and the second control signals input from the lower pin 113 of the third normally-open node 11 and the lower pin 123 of the fourth normally-open node 12 cannot be normally output.
2) When the first relay works normally and the second relay does not work, the first relay is powered on, and the second relay is powered off, so that only the first control signal can be ensured to be output. Specifically:
when the first relay works normally, the first control signal can be output normally;
when the second relay does not work, the third normally open node 11 is opened, the fourth normally open node 12 is opened, the third normally closed node 7 is closed, and the fourth normally closed node 8 is closed;
likewise, the second control signal and the security code signal cannot be normally output.
3) When the first relay does not work and the second relay works normally, the first relay is powered off, and the second relay is powered on, so that only the second control signal can be output. Specifically:
when the first relay does not work, the first normally open node 5 is opened, the second normally open node 6 is opened, the first normally closed node 1 is closed, and the second normally closed node 2 is closed; at this time, the first control signal cannot be normally output;
when the second relay works normally, a second control signal is input from the lower pin 113 of the third normally open node 11 and the lower pin 123 of the fourth normally open node 12, and reaches the upper pin 54 of the first normally open node 5 and the upper pin 64 of the second normally open node 6 through the first normally closed node 1 and the second normally closed node 2, so that the normal output of the second control signal is realized; however, since the third normally-closed node 7 and the fourth normally-closed node 8 are both in the off state, the safety code signal cannot be normally output at this time.
4) When the first relay and the second relay are not operated, the first relay is powered off, and the second relay is powered off, so that only the safety code signal can be ensured to be output. Specifically:
when the first relay does not work, the first normally open node 5 is opened, the second normally open node 6 is opened, the first normally closed node 1 is closed, and the second normally closed node 2 is closed; at this time, the first control signal cannot be normally output;
when the second relay does not work, the third normally open node 11 is opened, the fourth normally open node 12 is opened, the third normally closed node 7 is closed, and the fourth normally closed node 8 is closed;
at this time, the first control signal and the second control signal cannot be received by the signal switching circuit of the present application, but the safety code signal may be input from the lower pin 72 of the third normally closed node 7 and the lower pin 82 of the fourth normally closed node 8, pass through the third normally closed node 7 and the fourth normally closed node 8, and reach the upper pin 54 of the first normally open node 5 and the upper pin 64 of the second normally open node 6 through the first normally closed node 1 and the second normally closed node 2, so as to realize the normal output of the safety code signal.
As shown in fig. 1, ask_out1_1, ask_out1_2, schematically indicated at the upper pin 54 of the first normally open node 5 and the upper pin 64 of the second normally open node 6, represent the output of a signal, including a first control signal, a second control signal, or a security code signal.
The signal switching circuit based on relay logic can realize the following steps: 1. switching of the first control signal and the second control signal; 2. the first control signal, the second control signal and the safety code signal are independently output, so that three signal channels are isolated; 3. when neither the first control signal nor the second control signal can be received (the signal switching circuit cannot output either the first control signal or the second control signal), normal output of the security code signal is realized.
As shown in fig. 2, in a specific embodiment of the present application, a first control signal transmitting device is connected to a first normally open node 5 and a second normally open node 6 of a first relay, and specifically, the first control signal transmitting device is connected to a lower pin 53 of the first normally open node 5 and a lower pin 63 of the second normally open node 6, and is used for transmitting a first control signal to the first relay;
the second control signal transmitting device is connected with the third normally open node 11 and the fourth normally open node 12 of the second relay, specifically, the second control signal transmitting device is connected with the lower pin 113 of the third normally open node 11 and the lower pin 123 of the fourth normally open node 12, and is used for transmitting a second control signal to the second relay;
the security code signal transmitting device is specifically connected to the lower pin 72 of the third normally closed node 7 and the lower pin 82 of the fourth normally closed node, and in this embodiment, the security code signal is an 80HZ signal (shown as 80hz+ and 80HZ in fig. 2).
According to one embodiment of the application, the first relay further comprises a fifth normally open node 3 (comprising an upper pin 31 and a lower pin 32) and a sixth normally open node 4 (comprising an upper pin 44 and a lower pin 43); the fifth normally open node 3 is used as an external channel control node of the first relay, the second relay further comprises a seventh normally open node 9 (comprising an upper pin 91 and a lower pin 92) and an eighth normally open node 10 (comprising an upper pin 104 and a lower pin 103), the seventh normally open node 9 is used as an external channel control node of the second relay, and the fifth normally open node 3 is communicated with the seventh normally open node 9. For enabling output of the received signal: the fifth normally open node 3 outputs a first control signal when the first relay is energized to operate normally, and outputs a second control signal from the seventh normally open node 9 when only the second relay is energized to operate normally. As shown in fig. 1 or 2, in the present embodiment, the upper pin 31 and the lower pin 32 of the fifth normally open node 3 are respectively used for connecting the opcr1_1 end and the opcr1_2 end of the control external unit, and the upper pin 91 and the lower pin 92 of the seventh normally open node 9 are respectively used for connecting the opcr2_1 end and the opcr2_2 end of the control external unit, so as to output the first control signal, the second control signal or the security code signal to the control external unit.
The sixth normally open node 4 is used as an operation judgment IO signal output node of the first relay. Specifically, as shown IN fig. 1, a 24V detection signal (shown as +24v_in IN fig. 2) is input from the upper pin 44, and then it is determined whether the first relay is operating normally based on the feedback result detected at the lower pin 43: the failure to detect the feedback signal at the lower pin 43 (shown as z_aqym_fb_1 in fig. 2) indicates that the sixth normally open node 4 is in the off state and the first relay is in the off state.
The eighth normally open node 10 is used as an operation judging IO signal output node of the second relay, specifically, as shown IN fig. 1, a 24V detection signal (shown as +24v_in IN fig. 2) is input from the upper pin 104, and then whether the second relay is operating normally is judged according to the feedback result detected at the lower pin 103: the failure to detect a feedback signal (shown as b_aqym_fb_1 in fig. 2) at the lower pin 103 indicates that the eighth normally open node 10 is in the off state and the second relay is in the off state.
Fig. 2 is a schematic diagram showing another embodiment of a relay logic-based signal switching circuit according to the present application, wherein the first relay further includes a voltage detection circuit, the voltage detection circuit includes a resistor R1 and a resistor R2, the resistor R1 is connected to an A1 terminal of the first relay control coil, and the resistor R2 is connected to an A2 terminal of the first relay control coil; by means of this voltage detection circuit, it is detected whether the operating environment state of the first relay meets the requirements of the actual application scenario, as shown in fig. 2, the detection signals are represented in fig. 2 as z_ QHJ1 _1, z_ QHJ1 _2.
The second relay also comprises a voltage detection circuit, which comprises resistors R9 and R10: the resistor R9 is connected with the A3 terminal of the second relay control coil, and the resistor R10 is connected with the A4 terminal of the second relay control coil; by means of this voltage detection circuit, it is detected whether the operating environment state of the second relay is required for the actual application scenario, as shown in fig. 2, the detection signals are represented in fig. 2 as b_ QHJ1 _1_1, b_ QHJ1 _2.
The application also provides a signal switching system based on the relay logic, which comprises a first control signal transmitting device, a second control signal transmitting device, a safety code signal transmitting device, a first relay and a second relay;
the first relay and the second relay are connected to form the signal switching circuit;
the first control signal transmitting device is connected with the first relay and transmits a first control signal to the first relay;
the second control signal transmitting device is connected with the second relay and transmits a second control signal to the second relay;
the safety code signal transmitting device is connected with the second relay and transmits a safety code signal to the second relay;
the second relay receives and outputs a second control signal after being electrified; the second relay receives the safety code signal after power failure;
the first relay is disconnected from the second relay after being electrified, and receives a first control signal.
The application also provides a signal switching method based on relay logic, and the signal switching circuit based on the application comprises the following steps:
the first relay receives and outputs a first control signal when being electrified;
when the first relay is powered off and the second relay is powered on, the second relay receives and outputs a second control signal;
when the first relay and the second relay are powered off, the second relay receives the safety code signal and outputs the safety code signal.
In one practical application scene of the relay logic-based signal switching circuit, the relay logic-based signal switching method and the relay logic-based signal switching system, the first control signal transmitting equipment is a main code transmitting board, and the second control signal transmitting equipment is a standby code transmitting board; the main code transmitting plate is connected with an A1 terminal of the first relay control coil and an A2 terminal of the first relay control coil and used for controlling the first relay to act; the main code transmitting board is simultaneously connected with the lower pin 53 of the first normally open node 5 and the lower pin 63 of the second normally open node 6 and is used for transmitting a first control signal to the first relay. The standby code board is connected with an A3 terminal of the second relay control coil and an A4 terminal of the second relay control coil and used for controlling the second relay to act; the standby code board is connected with the lower pin 113 of the third normally open node 11 and the lower pin 123 of the fourth normally open node 12 at the same time and is used for sending a second control signal to the second relay.
Referring to fig. 2, when the main code transmitting board and the standby code transmitting board work normally, control signal switching between the main system and the standby system can be performed; when the main code plate or the standby code plate works normally, a control signal (a first control signal or a second control signal) is output through the main code plate or the standby code plate; when the main system and the standby system cannot work normally, the control signal cannot be output, and the safety code signal sent by the safety code signal sending equipment can be output through the signal switching circuit, so that the driving safety of a train can be ensured.
Although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (9)
1. A signal switching circuit based on relay logic is characterized by comprising a first relay and a second relay,
the first relay is connected with a first control signal transmitting device and the second relay; the first control signal transmitting device is used for connecting the first relay with the second relay after the first relay is electrified, and receiving a first control signal transmitted by the first control signal transmitting device;
the second relay is connected with second control signal transmitting equipment and safety code signal transmitting equipment; the control device is used for disconnecting the safety code signal transmitting device after being electrified and receiving a second control signal transmitted by the second control signal transmitting device;
the second relay is further used for receiving the safety code signal sent by the safety code signal sending device after power is off;
the first relay comprises a first normally closed node, a second normally closed node, a first normally open node and a second normally open node;
the first normally closed node is connected with the first normally open node;
the second normally closed node is connected with the second normally open node;
the first normally open node is used for connecting the first control signal transmitting equipment;
the second normally open node is used for connecting the first control signal transmitting equipment;
the second relay comprises a third normally closed node, a fourth normally closed node, a third normally open node and a fourth normally open node;
the third normally-closed node is connected with the first normally-closed node;
the fourth normally-closed node is connected with the second normally-closed node;
the third normally open node is used for connecting the second control signal transmitting equipment;
the fourth normally open node is used for connecting the second control signal transmitting device.
2. The relay logic based signal switching circuit of claim 1, wherein the first relay further comprises a fifth normally-on node for outputting the first control signal when the first relay is energized.
3. The relay logic-based signal switching circuit of claim 1, wherein the first relay further comprises a sixth normally open node, the sixth normally open node being a detection terminal of the first relay, and wherein the detection signal is received to detect whether the first relay is energized.
4. The relay logic based signal switching circuit of claim 1, wherein,
the third normally closed node is used for connecting the safety code signal transmitting equipment;
and the fourth normally closed node is used for connecting the safety code signal transmitting equipment.
5. The relay logic based signal switching circuit of claim 1, wherein the second relay further comprises a seventh normally open node for outputting the second control signal.
6. The relay logic-based signal switching circuit of claim 1, wherein the second relay further comprises an eighth normally open node, the eighth normally open node being a detection terminal of the second relay, and the detection signal is received to detect whether the second relay is energized.
7. The relay logic based signal switching circuit of claim 1, wherein,
the first control signal transmitting equipment is a main code transmitting board; the second control signal sending equipment is a standby code board; the standby code plate and the main code plate are mutually isolated.
8. A signal switching method of the relay logic-based signal switching circuit according to any one of claims 1 to 7, comprising the steps of:
the first relay receives and outputs the first control signal when being electrified;
when the first relay is powered off and the second relay is powered on, the second relay receives the second control signal and outputs the second control signal;
and when the first relay and the second relay are both powered off, the second relay receives the safety code signal and outputs the safety code signal.
9. The signal switching system based on the relay logic is characterized by comprising a first control signal transmitting device, a second control signal transmitting device, a safety code signal transmitting device, a first relay and a second relay;
the first control signal transmitting device is connected with the first relay and transmits a first control signal to the first relay;
the second control signal transmitting device is connected with the second relay and transmits a second control signal to the second relay;
the safety code signal transmitting device is connected with the second relay and transmits a safety code signal to the second relay;
the second relay receives the second control signal after being electrified and outputs the second control signal; the second relay receives the safety code signal after power is off;
the first relay is disconnected from the second relay after being electrified, and the first control signal is received;
the first relay comprises a first normally closed node, a second normally closed node, a first normally open node and a second normally open node;
the first normally closed node is connected with the first normally open node;
the second normally closed node is connected with the second normally open node;
the first normally open node is used for connecting the first control signal transmitting equipment;
the second normally open node is used for connecting the first control signal transmitting equipment;
the second relay comprises a third normally closed node, a fourth normally closed node, a third normally open node and a fourth normally open node;
the third normally-closed node is connected with the first normally-closed node;
the fourth normally-closed node is connected with the second normally-closed node;
the third normally open node is used for connecting the second control signal transmitting equipment;
the fourth normally open node is used for connecting the second control signal transmitting device.
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