Signal "N selects M" conventional relay logic device

Abstract

This utility model discloses a conventional relay logic device for "N-to-M" signal selection. Taking "5-to-3" signal selection as an example, it mainly consists of a signal input module, a logic synthesis and judgment output module, and a signal source early warning and device fault alarm output module. The signal input module mainly consists of 5 branches; the logic synthesis and judgment output module mainly consists of 2 branches; and the signal source early warning and device fault alarm output module mainly consists of 12 branches. This utility model is used to ensure the reliability of the signal source and avoid large-scale emergency equipment operation caused by malfunctions, which could lead to losses in engineering projects. It performs "N-to-M" logic judgment on the signal source circuit. It has standardized design specifications, a wide range of applications, and can be directly installed and used. It is suitable for various hydropower and power engineering projects, as well as various industries that use "N-to-M" logic to improve signal accuracy.

Description

Technical Field

[0001] This utility model pertains to relay logic devices, and more particularly relates to a conventional relay logic device with a signal "N selects M". Background Technology

[0002] In the hydropower and power engineering industry, or in other sectors, certain critical accident signals often trigger large-scale emergency equipment actions to ensure project safety, making the accuracy of these signals particularly important.

[0003] To ensure the reliability of the signal sources and avoid large-scale equipment emergency actions caused by malfunctions, which could lead to project losses, the signal source circuit implements an "N-to-M" logic requirement (following the "majority rule" principle, where N is an odd number and N ≥ 3, M = (N+1) / 2). This means that if N signal sources are configured, and M or more of the received N signals have the same state, the signal state is considered valid. In practical applications, "5-to-3" or "3-to-2" logic can be selected depending on specific needs. This type of logic has a very high overall output accuracy for important signals and is a commonly used combinational logic for important emergency signals.

[0004] In hydropower and power engineering, the application scenarios include: flooding detection in power plants, overspeed detection in generating units, and heavy gas detection in main transformers. Signals from other industries may also utilize the "N-to-M" logic. However, no specific requirements or typical solutions have been specified for the implementation of the "N-to-M" logic across industries, and there are no universally applicable products on the market. Even when selection logic loops are implemented in some industries, the timely detection and handling of fault signal sources are often neglected, ultimately affecting the correctness of the output signal. Currently, the following problems often arise during project implementation:

[0005] (1) Each project requires a redesign. The standardization is not high, and different projects have different solutions. Different parts of the same project may also have different solutions. The design solution is greatly influenced by human factors, and the design quality is difficult to guarantee.

[0006] (2) Currently, commonly used protection devices and automatic control devices do not have the "N select M" logic judgment function, and it is expected that it will not be realized in the short term.

[0007] (3) The production process is time-consuming. Each project requires the manufacturer to purchase and produce according to different plans proposed by each design unit. Each project also requires internal wiring according to different plans, which makes the production process time-consuming and inefficient.

[0008] (4) Installation and commissioning time. If problems occur during on-site installation and commissioning, the internal circuit wiring must be checked one by one.

[0009] (5) When multiple signals malfunction or fail to activate simultaneously at the input of “N select M”, the output of “N select M” may be incorrect. To ensure the correctness of the output signal of “N select M”, a sound signal fault alarm function needs to be designed, along with necessary manual intervention to promptly repair the fault signal. However, there is currently no standard design scheme. If the alarm function is not well designed, the fault signal cannot be detected and processed quickly, and the correctness of the output of “N select M” cannot be guaranteed. Summary of the Invention

[0010] The technical problem to be solved by this utility model is to provide a conventional relay logic device for "N selects M" signal with standard design specifications and wide applicability.

[0011] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0012] The "N-to-M" conventional relay logic device mainly consists of a signal input module, a logic synthesis and judgment output module, and a signal source early warning and device fault alarm output module. The signal input module mainly consists of 5 branches, namely the external original signal 1 input branch to the external original signal 5 input branch. The logic synthesis and judgment output module mainly consists of 2 branches, namely the logic synthesis and judgment branch and the logic output branch. The signal source early warning and device fault alarm output module mainly consists of 12 branches, namely the output relay fault alarm branch, the signal 1 false start early warning branch to the signal 5 false start early warning branch, the signal 1 failure to start early warning branch to the signal 5 failure to start early warning branch, and the device power failure alarm branch.

[0013] In the signal input module:

[0014] In the external raw signal 1 input branch, the front end of the "external raw signal 1" contact is connected to the positive power supply 501, the rear end is connected to the front end of the relay K1 coil, and the rear end of the relay K1 coil is connected to the negative power supply 502.

[0015] In the external raw signal 2 input branch, the front end of the "external raw signal 2" contact is connected to the positive power supply 501, the rear end is connected to the front end of the relay K2 coil, and the rear end of the relay K2 coil is connected to the negative power supply 502.

[0016] In the external raw signal 3 input branch, the front end of the "external raw signal 3" contact is connected to the positive power supply 501, the rear end is connected to the front end of the relay K3 coil, and the rear end of the relay K3 coil is connected to the negative power supply 502.

[0017] In the external original signal 4 input branch, the front end of the switch SA is connected to the positive power supply 501, the rear end of the switch SA is connected to the front end of the "external original signal 4" contact, the rear end of the "external original signal 4" contact is connected to the front end of the relay K4 coil, and the rear end of the relay K4 coil is connected to the negative power supply 502.

[0018] In the external original signal 5 input branch, the rear end of the switch SA is connected to the front end of the "external original signal 5" contact, the rear end of the "external original signal 5" contact is connected to the front end of the relay K5 coil, and the rear end of the relay K5 coil is connected to the negative power supply 502.

[0019] The signal input module is connected in parallel to the control power monitoring branch. The front end of the parallel connection is connected to the DC positive power supply WC+ via circuit breaker QF1, and the rear end of the parallel connection is connected to the DC negative power supply WC- via circuit breaker QF1. The control power monitoring branch includes the power monitoring relay KMO and indicator light HW of the device body connected in parallel.

[0020] In the logic synthesis and judgment output module:

[0021] In the logic synthesis and judgment branch, the front ends of the normally open contacts of relays K1, K4, and K5, and the front end of the changeover switch SA are connected in parallel and then connected to the positive power supply 501; the rear end of the normally open contact of relay K5 is connected in parallel with the rear end of the changeover switch SA and then connected in series with the front end of the normally open contact of relay K1; the front ends of the normally open contacts of relays K2, K3, and K4 are connected in parallel and then connected in series with the rear end of the normally open contact of relay K1; the rear end of the normally open contact of relay K4 is connected in parallel with the rear end of the changeover switch SA and then connected in series with the front end of the normally open contact of relay K2; the normally open contacts of relays K1, K3, and K5... The normally open contacts of relays K1 and K5 are connected in parallel to each other and then connected in series with the rear end of the normally open contact of relay K2; the rear ends of the normally open contacts of relays K1 and K5 are connected in parallel and then connected in series with the front end of the normally open contact of relay K3; the front ends of the normally open contacts of relays K2 and K4 are connected in parallel and then connected in series with the rear end of the normally open contact of relay K3; the rear ends of the normally open contacts of relays K1, K2, K3, K4, and K5 are connected in parallel; the front ends of the coils of relays K10 and K11 are connected in parallel; the rear ends of the normally open contacts of relays K10 and K11 are connected in series with the front ends of the coils of relays K10 and K11; the rear ends of the coils of relays K10 and K11 are connected in parallel and then connected to the negative power supply 502.

[0022] In the logic output branch, the output contacts include one pair of normally open contacts for each of relays K10 and K11, and these two pairs of normally open contacts are connected in parallel.

[0023] In the signal source early warning and device fault alarm output module:

[0024] The output relay fault alarm branch includes the normally closed contact and normally open contact of relay K10 connected in parallel; the rear end of the normally closed contact of relay K10 is connected to the front end of the normally open contact of relay K11; the rear end of the normally open contact of relay K10 is connected to the front end of the normally closed contact of relay K11; and the rear ends of the normally closed contact and normally open contact of relay K11 are connected in parallel.

[0025] Signal 1 false alarm includes the normally closed contact of relay K10 and the normally open contact of relay K1 connected in sequence;

[0026] Signal 2 false alarm includes the normally closed contact of relay K10 and the normally open contact of relay K2 connected in sequence;

[0027] Signal 3 false alarm includes the normally closed contact of relay K10 and the normally open contact of relay K3 connected in sequence;

[0028] Signal 4 false alarm includes the normally closed contact of relay K10 and the normally open contact of relay K4 connected in sequence;

[0029] Signal 5 false alarm includes the normally closed contact of relay K10 and the normally open contact of relay K5 connected in sequence;

[0030] Signal 1, the failure to operate warning, includes the normally open contact of relay K10 and the normally closed contact of relay K1 connected in sequence;

[0031] Signal 2, the failure to operate warning, includes the normally open contact of relay K10 and the normally closed contact of relay K2 connected in sequence;

[0032] Signal 3, the failure to operate warning, includes the normally open contact of relay K10 and the normally closed contact of relay K3 connected in sequence;

[0033] Signal 4, the failure to operate warning, includes the normally open contact of relay K10, the normally closed contact of changeover switch SA and relay K4 connected in sequence;

[0034] Signal 5, the failure to operate warning, includes the normally open contact of relay K10, the normally closed contact of changeover switch SA and relay K5 connected in sequence;

[0035] The device power failure alarm branch includes the normally closed contact of relay KMO.

[0036] The aforementioned "N selects M" conventional relay logic device also includes a metal housing, with various relays encapsulated inside the metal housing, and various switching switches, indicator lights, etc., embedded in the metal housing.

[0037] To address the design and usage problems of signals requiring "N-to-M" logic selection in various hydropower and power engineering projects, the inventors have designed a conventional relay logic device for "N-to-M" signals. Taking a "5-to-3" signal selection as an example, it mainly consists of a signal input module, a logic synthesis and judgment output module, and a signal source early warning and device fault alarm output module. The signal input module mainly consists of 5 branches: external original signal 1 input branch to external original signal 5 input branch. The logic synthesis and judgment output module mainly consists of 2 branches: a logic synthesis and judgment branch and a logic output branch. The signal source early warning and device fault alarm output module mainly consists of 12 branches: an output relay fault alarm branch, a signal 1 false start early warning branch to a signal 5 false start early warning branch, a signal 1 failure to start early warning branch to a signal 5 failure to start early warning branch, and a device power failure alarm branch. This utility model is used to ensure the reliability of the signal source and avoid large-scale emergency equipment operation caused by false start, thus preventing losses to the project. It implements "N-to-M" logic judgment for the signal source circuit. The device is designed according to standards and has a wide range of applications. It can be directly installed and used, and is suitable for various hydropower and power projects, as well as various industries that use "N-to-M" logic to improve signal accuracy.

[0038] Specifically, compared with the prior art, this utility model has the following outstanding advantages:

[0039] The "N-to-M" logic circuit design is more sophisticated, featuring alarm functions for malfunctions and failures to operate by various signal sources. This allows for timely detection of signal source failure risks, facilitating prompt repair and ensuring the correctness of the integrated output signal from the "N-to-M" logic. The device is also equipped with a switch to allow switching to other "N-to-M" modes. For example, in a "5-to-3" signal selection mode, the "5-to-3" logic circuit can be switched to "3-to-2" logic via the switch, meaning that a conventional "5-to-3" relay logic device can also be used for "3-to-2" logic requirements.

[0040] Early warnings are provided for faults such as malfunctions and failures to operate of each signal source, so that they can be detected and dealt with in a timely manner in the early stage of the fault. This ensures the correctness of the output signal of the "N selects M" logic synthesis and avoids the signal correctness being greatly affected or even developing into a major accident due to the successive failure of multiple signal sources.

[0041] (3) Standardized design solves the problem of having to redesign for each project and reduces the time required for loop design.

[0042] (4) Easy to use. It is a packaged, standardized product that can be directly installed and used. The whole unit is installed in the cabinet, and users can directly connect to the corresponding interface, which improves the ease of use.

[0043] (5) It can be standardized and scaled up to improve production efficiency and reduce production costs.

[0044] (6) During installation and commissioning, only the external interface of the device needs to be connected, and the internal circuit does not need to be checked, which improves the efficiency of installation and commissioning.

[0045] (7) It has a wide range of applications and can be used wherever the signal adopts the "N selects M" logic. It is not limited to any industry or project type. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structural principle of the signal input module in the conventional relay logic device for the "N selects M" signal.

[0047] Figure 2 This is a schematic diagram of the structural principle of the logic synthesis judgment output module in the conventional relay logic device of the "N selects M" signal.

[0048] Figure 3 This is a schematic diagram of the structural principle of the signal source early warning and device fault alarm output module in the conventional relay logic device of the "N selects M" signal. Detailed Implementation

[0049] I. Design Principles

[0050] like Figures 1 to 3 As shown, the present invention provides a conventional relay logic device for selecting M from N signals. It achieves comprehensive signal judgment through conventional relay logic, and combines relays, terminals and other components into a circuit with fixed logic. The circuit is then encapsulated in a robust metal housing with good electromagnetic shielding and heat dissipation, forming an independent device.

[0051] The device is functionally divided into three parts: signal input, "N-to-M" logic comprehensive judgment output, and signal source early warning and device fault alarm output.

[0052] (1) Signal input: Connect N original signals to the corresponding independent interfaces of the device to trigger the corresponding re-operation relays respectively.

[0053] (2) "N-to-M" logic comprehensive judgment output: The auxiliary contacts of the original signal re-operation relay are combined to form an "N-to-M" logic wiring. The device can be switched to other "N-to-M" modes by a switch. Taking the signal "5-to-3" as an example, the logic judgment modes of "5-to-3" and "3-to-2" can be selected by the switch.

[0054] (3) Signal source early warning and device fault alarm output: The signal source early warning uses the normally open and normally closed auxiliary contacts of the re-operation relay to form an alarm output signal for each signal source malfunction or failure to operate, which facilitates timely detection and handling in the early stage of the fault, ensures the correctness of the "N select M" logic integrated output signal, and avoids the development of a major accident. When the device power is lost, the device can output a "device fault alarm" signal.

[0055] The circuit is encapsulated in a metal housing. External interfaces such as power supply, signal reactivation, trip output, and signal output are standardized and fixed, arranged in a hard-wired manner at the rear of the device, forming a standardized product. Users can directly connect the corresponding interfaces according to their functional requirements. The device dimensions are designed according to the electrical device dimensions in standard cabinets, facilitating installation within cabinets.

[0056] II. Basic Structure

[0057] The following embodiments use a conventional relay logic device with a "5-to-3" signal selection as an example to describe the present invention in detail.

[0058] This utility model of a conventional relay logic device for selecting M from N signals mainly consists of a signal input module, a logic synthesis and judgment output module, and a signal source early warning and device fault alarm output module.

[0059] 2.1 Signal Input Module

[0060] The signal input module is responsible for connecting the "5-to-3" conventional relay logic device to the original signals from external devices. In other words, external signals that require processing by the "5-to-3" conventional relay logic device are input through the signal input module.

[0061] The signal input module mainly consists of 5 branches, namely, external raw signal 1 input branch to external raw signal 5 input branch; among them,

[0062] In the external raw signal 1 input branch, the front end of the "external raw signal 1" contact is connected to the positive power supply 501, the rear end is connected to the front end of the relay K1 coil, and the rear end of the relay K1 coil is connected to the negative power supply 502.

[0063] In the external raw signal 2 input branch, the front end of the "external raw signal 2" contact is connected to the positive power supply 501, the rear end is connected to the front end of the relay K2 coil, and the rear end of the relay K2 coil is connected to the negative power supply 502.

[0064] In the external raw signal 3 input branch, the front end of the "external raw signal 3" contact is connected to the positive power supply 501, the rear end is connected to the front end of the relay K3 coil, and the rear end of the relay K3 coil is connected to the negative power supply 502.

[0065] In the external original signal 4 input branch, the front end of the switch SA is connected to the positive power supply 501, the rear end of the switch SA is connected to the front end of the "external original signal 4" contact, the rear end of the "external original signal 4" contact is connected to the front end of the relay K4 coil, and the rear end of the relay K4 coil is connected to the negative power supply 502.

[0066] In the external original signal 5 input branch, the rear end of the switch SA is connected to the front end of the "external original signal 5" contact, the rear end of the "external original signal 5" contact is connected to the front end of the relay K5 coil, and the rear end of the relay K5 coil is connected to the negative power supply 502.

[0067] The signal input module is connected in parallel to the control power monitoring branch. The front end of the parallel connection is connected to the DC positive power supply WC+ via circuit breaker QF1, and the rear end of the parallel connection is connected to the DC negative power supply WC- via circuit breaker QF1. The control power monitoring branch includes the power monitoring relay KMO and indicator light HW of the device body connected in parallel.

[0068] 2.2 Logic Synthesis and Output Module

[0069] The logic synthesis judgment output module mainly uses the auxiliary contacts of the original signal re-operation relay to be combined to form a "5-to-3" logic wiring. After logic judgment, it determines whether to output the signal. The device can also be switched to a "3-to-2" logic judgment mode by a switch.

[0070] The logic synthesis and output module mainly consists of two branches: a logic synthesis and judgment branch and a logic output branch; among them,

[0071] In the logic synthesis and judgment branch, the front ends of the normally open contacts of relays K1, K4, and K5, and the front end of the changeover switch SA are connected in parallel and then connected to the positive power supply 501; the rear end of the normally open contact of relay K5 is connected in parallel with the rear end of the changeover switch SA and then connected in series with the front end of the normally open contact of relay K1; the front ends of the normally open contacts of relays K2, K3, and K4 are connected in parallel and then connected in series with the rear end of the normally open contact of relay K1; the rear end of the normally open contact of relay K4 is connected in parallel with the rear end of the changeover switch SA and then connected in series with the front end of the normally open contact of relay K2; the normally open contacts of relays K1, K3, and K5... The normally open contacts of relays K1 and K5 are connected in parallel to each other and then connected in series with the rear end of the normally open contact of relay K2; the rear ends of the normally open contacts of relays K1 and K5 are connected in parallel and then connected in series with the front end of the normally open contact of relay K3; the front ends of the normally open contacts of relays K2 and K4 are connected in parallel and then connected in series with the rear end of the normally open contact of relay K3; the rear ends of the normally open contacts of relays K1, K2, K3, K4, and K5 are connected in parallel; the front ends of the coils of relays K10 and K11 are connected in parallel; the rear ends of the normally open contacts of relays K10 and K11 are connected in series with the front ends of the coils of relays K10 and K11; the rear ends of the coils of relays K10 and K11 are connected in parallel and then connected to the negative power supply 502.

[0072] In the logic output branch, the output contacts include one pair of normally open contacts for each of relays K10 and K11, and these two pairs of normally open contacts are connected in parallel.

[0073] 2.3 Signal Source Early Warning and Device Fault Alarm Output Module

[0074] The signal source early warning and device fault alarm output module is mainly responsible for sending fault signals of the logic device itself, as well as alarm signals of each signal source malfunction and failure to operate, to the monitoring system. This facilitates timely detection and handling of faults in their early stages, ensuring the correctness of the "N-to-M" logic integrated output signal and preventing it from developing into a major accident.

[0075] The signal source early warning and device fault alarm output module mainly consists of 12 branches: output relay fault alarm branch, signal 1 false start early warning branch to signal 5 false start early warning branch, signal 1 failure to start early warning branch to signal 5 failure to start early warning branch, and device power failure alarm branch. Among them,

[0076] The output relay fault alarm branch includes the normally closed contact and normally open contact of relay K10 connected in parallel; the rear end of the normally closed contact of relay K10 is connected to the front end of the normally open contact of relay K11; the rear end of the normally open contact of relay K10 is connected to the front end of the normally closed contact of relay K11; and the rear ends of the normally closed contact and normally open contact of relay K11 are connected in parallel.

[0077] Signal 1 false alarm includes the normally closed contact of relay K10 and the normally open contact of relay K1 connected in sequence;

[0078] Signal 2 false alarm includes the normally closed contact of relay K10 and the normally open contact of relay K2 connected in sequence;

[0079] Signal 3 false alarm includes the normally closed contact of relay K10 and the normally open contact of relay K3 connected in sequence;

[0080] Signal 4 false alarm includes the normally closed contact of relay K10 and the normally open contact of relay K4 connected in sequence;

[0081] Signal 5 false alarm includes the normally closed contact of relay K10 and the normally open contact of relay K5 connected in sequence;

[0082] Signal 1, the failure to operate warning, includes the normally open contact of relay K10 and the normally closed contact of relay K1 connected in sequence;

[0083] Signal 2, the failure to operate warning, includes the normally open contact of relay K10 and the normally closed contact of relay K2 connected in sequence;

[0084] Signal 3, the failure to operate warning, includes the normally open contact of relay K10 and the normally closed contact of relay K3 connected in sequence;

[0085] Signal 4, the failure to operate warning, includes the normally open contact of relay K10, the normally closed contact of changeover switch SA and relay K4 connected in sequence;

[0086] Signal 5, the failure to operate warning, includes the normally open contact of relay K10, the normally closed contact of changeover switch SA and relay K5 connected in sequence;

[0087] The device power failure alarm branch includes the normally closed contact of relay KMO.

[0088] The above embodiments are mainly for the design of "5-to-3" conventional relay logic and are not intended to limit the present invention in any way. The signal input and output, logic synthesis judgment, and signal source warning signal output requirements of different "N-to-M" conventional relay logics will be different. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A conventional relay logic device for signal "N selects M", characterized in that... It consists of a signal input module, a logic synthesis and judgment output module, and a signal source early warning and device fault alarm output module; the signal input module consists of 5 branches, namely external original signal 1 input branch to external original signal 5 input branch; The logic synthesis judgment output module consists of two branches: a logic synthesis judgment branch and a logic output branch. The signal source early warning and device fault alarm output module consists of twelve branches: an output relay fault alarm branch, a signal 1 false start early warning branch to a signal 5 false start early warning branch, a signal 1 failure to start early warning branch to a signal 5 failure to start early warning branch, and a device power failure alarm branch.

2. The conventional relay logic device for signal "N selects M" according to claim 1, characterized in that... In the signal input module: In the external original signal 1 input branch, the front end of the "external original signal 1" contact is connected to the positive power supply (501), the rear end is connected to the front end of the relay K1 coil, and the rear end of the relay K1 coil is connected to the negative power supply (502). In the input branch of external original signal 2, the front end of the "external original signal 2" contact is connected to the positive power supply (501), the rear end is connected to the front end of the relay K2 coil, and the rear end of the relay K2 coil is connected to the negative power supply (502). In the input branch of external original signal 3, the front end of the "external original signal 3" contact is connected to the positive power supply (501), the rear end is connected to the front end of the relay K3 coil, and the rear end of the relay K3 coil is connected to the negative power supply (502). In the input branch of external raw signal 4, the front end of the switch SA is connected to the positive power supply (501), the rear end of the switch SA is connected to the front end of the "external raw signal 4" contact, the rear end of the "external raw signal 4" contact is connected to the front end of the relay K4 coil, and the rear end of the relay K4 coil is connected to the negative power supply (502). In the input branch of external original signal 5, the rear end of the switch SA is connected to the front end of the contact of "external original signal 5", the rear end of the contact of "external original signal 5" is connected to the front end of the coil of relay K5, and the rear end of the coil of relay K5 is connected to the negative power supply (502). The signal input module is connected in parallel to the control power monitoring branch. The front end of the parallel connection is connected to the DC positive power supply WC+ via circuit breaker QF1, and the rear end of the parallel connection is connected via circuit breaker... QF1 connects to the DC negative power supply WC-; the control power monitoring branch includes the power monitoring relay KMO and indicator light HW connected in parallel to the device body.

3. The conventional relay logic device for signal "N selects M" according to claim 1, characterized in that... In the logic synthesis and judgment output module: In the logic synthesis and judgment branch, the front ends of the normally open contacts of relays K1, K4, and K5, and the front end of the changeover switch SA are connected in parallel and then connected to the positive power supply (501); the rear end of the normally open contact of relay K5 is connected in parallel with the rear end of the changeover switch SA and then connected in series with the front end of the normally open contact of relay K1; the front ends of the normally open contacts of relays K2, K3, and K4 are connected in parallel and then connected in series with the rear end of the normally open contact of relay K1; the rear end of the normally open contact of relay K4 is connected in series with the changeover switch SA. The rear ends are connected in parallel and then connected in series with the front end of the normally open contact of relay K2. The front ends of the normally open contacts of relays K1, K3, and K5 are connected in parallel and then connected in series with the rear end of the normally open contact of relay K2. The rear ends of the normally open contacts of relays K1 and K5 are connected in parallel and then connected in series with the front end of the normally open contact of relay K3. The front ends of the normally open contacts of relays K2 and K4 are connected in parallel and then connected in series with the rear end of the normally open contact of relay K3. The rear ends of the normally open contacts of relays K1, K2, K3, K4, and K5 are connected in parallel. The front ends of the coils of relays K10 and K11 are connected in parallel, and the rear ends of the normally open contacts of relays K10 and K11 are connected in series with the front ends of the coils of relays K10 and K11. The rear ends of the coils of relays K10 and K11 are connected in parallel and then connected to the negative power supply (502). In the logic output branch, the output contacts include one pair of normally open contacts for each of relays K10 and K11, and these two pairs of normally open contacts are connected in parallel.

4. The conventional relay logic device for signal "N selects M" according to claim 1, characterized in that... In the signal source early warning and device fault alarm output module: The output relay fault alarm branch includes the normally closed contact and normally open contact of relay K10 connected in parallel; the rear end of the normally closed contact of relay K10 is connected to the front end of the normally open contact of relay K11; the rear end of the normally open contact of relay K10 is connected to the front end of the normally closed contact of relay K11; and the rear ends of the normally closed contact and normally open contact of relay K11 are connected in parallel. Signal 1, the false alarm, includes the normally closed contact of relay K10 and the normally open contact of relay K1 connected in sequence; Signal 2, the false alarm, includes the normally closed contact of relay K10 and the normally open contact of relay K2 connected in sequence; Signal 3, the false alarm, includes the normally closed contact of relay K10 and the normally open contact of relay K3 connected in sequence; Signal 4, the false alarm, includes the normally closed contact of relay K10 and the normally open contact of relay K4 connected in sequence; Signal 5, the false alarm, includes the normally closed contact of relay K10 and the normally open contact of relay K5 connected in sequence; Signal 1, the failure to operate warning, includes the normally open contact of relay K10 and the normally closed contact of relay K1 connected in sequence; Signal 2, the failure to operate warning, includes the normally open contact of relay K10 and the normally closed contact of relay K2 connected in sequence; Signal 3, the failure to operate warning, includes the normally open contact of relay K10 and the normally closed contact of relay K3 connected in sequence; Signal 4, the failure to operate warning, includes the normally open contact of relay K10, the normally closed contact of changeover switch SA, and relay K4 connected in sequence; Signal 5, the failure to operate warning, includes the normally open contact of relay K10, the normally closed contact of changeover switch SA, and relay K5 connected in sequence; The device power failure alarm branch includes the normally closed contact of relay KMO.

5. The conventional relay logic device for signal "N selects M" according to claim 1, characterized in that... It also includes a metal housing, with various relays encapsulated inside the metal housing, and various switches and indicator lights embedded in the metal housing.

Images