Control cabinet automatic detection mounting plate and PLC automatic detection control cabinet

Abstract

The utility model discloses a PLC automatic detection control cabinet, and relates to the technical field of PLC testing. In order to solve the technical problems in the prior art that the existing PLC test work mainly depends on manual operation, is low in efficiency and high in error rate, so that the test cost is increased, the test period is prolonged, and even the overall progress of a project is influenced, the technical scheme provided by the utility model is as follows: the automatic detection mounting plate for the control cabinet comprises a test PLC module, a test PLC module and a test PLC module, the test module provides a test algorithm; the analog quantity signal conversion module is used for converting the active analog quantity output signal into a passive analog quantity output signal; the digital quantity signal conversion module is used for converting the active digital quantity output signal into a passive digital quantity output signal; the analog signal introduction module is used for receiving an analog quantity input signal and sending the analog quantity input signal to the test PLC module; and the digital signal introduction module is used for receiving a digital quantity input signal and sending the digital quantity input signal to the test PLC module. The method is suitable for automatic detection of the PLC control cabinet.

Description

Technical Field

[0001] This relates to the field of PLC testing technology, specifically to PLC cabinet testing methods. Background Technology

[0002] In modern industrial automation systems, PLCs (Programmable Logic Controllers) are widely used in various automated control and monitoring tasks, serving as a core component to ensure system stability and efficiency. Therefore, PLC testing is crucial for the normal operation of the entire industrial automation system. The accuracy and efficiency of testing directly affect the system's reliability, safety, and operating costs. However, existing PLC testing procedures still have many limitations and technical challenges that urgently need improvement.

[0003] Currently, PLC testing primarily relies on manual operation, a complex process prone to errors. First, technicians need to manually set up the test program based on the specific configuration of the PLC cabinet under test. This process typically requires a thorough understanding of the specifications, functions, and interfaces of each PLC module to ensure the test program covers all possible operating scenarios. However, due to the wide variety and complex configurations of PLC modules, technicians not only spend a significant amount of time setting up test programs but are also prone to incomplete coverage or incorrect settings due to oversights.

[0004] After the test program is set up, the testers must manually connect the test program to each PLC module according to the program's requirements. This process is extremely challenging because its complexity results in a low fault tolerance rate; even slight carelessness can lead to incorrect or missing connections, affecting the accuracy of the test results. This manual connection process is particularly time-consuming in practice and usually requires at least two technicians working together, increasing labor costs and operation time. Furthermore, due to the significant amount of manual operation during the testing process, any improper operation can trigger system malfunctions, further reducing the reliability of the test.

[0005] Specifically, testing typically requires:

[0006] Personnel: Two testers operate simultaneously.

[0007] Time: It takes 1.5 to 2 hours to complete the testing of all modules, which is a long time.

[0008] The test time for a single DI or DO channel is 3 seconds, the test time for a 16-channel module is approximately 48 seconds, and the test time for a 32-channel module is approximately 96 seconds.

[0009] The test time for a single AI or AO module is 5 seconds, and the test time for an 8-channel module is approximately 40 seconds.

[0010] Procedure: Testers need to manually connect and power on each module and channel in sequence to test them.

[0011] The test results need to be recorded manually during the testing process.

[0012] Testing requires the use of many tools such as multimeters, signal generators, and walkie-talkies.

[0013] Accuracy: Human factors, such as fatigue or negligence, may lead to a decrease in test accuracy.

[0014] Efficiency: The testing process is cumbersome, inefficient, and unable to handle a large number of or urgent testing needs.

[0015] Furthermore, as the scale and complexity of industrial automation systems continue to increase, traditional manual PLC testing methods can no longer meet the growing demands. During large-scale PLC system testing, the inefficiency and high error rate of manual operation become more pronounced, leading to increased testing costs, extended testing cycles, and even impacting the overall project schedule.

[0016] In summary, testing the signal modules of a PLC cabinet is a complex and time-consuming process in the current technology. This is mainly because it requires manual connection and power-on to test each module and channel sequentially, which is not only inefficient but also prone to human error. Furthermore, the testing process requires manual recording, which is inconvenient to save.

[0017] While some solutions exist in the existing technology, such as using automated testing equipment to test specific modules, these solutions still have some significant drawbacks. First, these automated testing devices can typically only test specific modules or channels, failing to comprehensively test the correctness of the entire circuitry within the cabinet, from modules to wiring. Second, due to the varying structures and connection methods of PLC cabinets, these automated testing devices often require extensive customization and debugging to adapt to different testing environments. This not only increases testing costs but also reduces testing flexibility and versatility.

[0018] Therefore, we need a new testing tool that can comprehensively and accurately test all signal module channels and lines in the PLC cabinet, while improving testing efficiency and accuracy and reducing the risk of human error. Utility Model Content

[0019] To address the technical problems existing in current PLC testing, which rely heavily on manual operation, resulting in low efficiency, high error rates, increased testing costs, extended testing cycles, and even impacting the overall project schedule, this utility model provides the following technical solution:

[0020] The control cabinet automatically detects the mounting plate, the mounting plate comprising:

[0021] Test PLC module to provide test algorithms;

[0022] Analog signal conversion module, used to convert active analog output signals into passive analog output signals;

[0023] A digital signal conversion module is used to convert active digital output signals into passive digital output signals;

[0024] The analog signal input module is used to receive analog input signals and send them to the test PLC module;

[0025] The digital signal input module is used to receive digital input signals and send them to the test PLC module.

[0026] Furthermore, a preferred embodiment is provided in which the test PLC module, analog signal conversion module, digital signal conversion module, digital signal input module, and analog signal input module are arranged sequentially on the mounting plate.

[0027] Furthermore, a preferred embodiment is provided, which also includes a power supply module for supplying power to the test PLC module, analog signal conversion module, digital signal conversion module, analog signal input module and digital signal input module.

[0028] Furthermore, in a preferred embodiment, the power supply module is disposed on the analog signal conversion module or the digital signal conversion module.

[0029] Furthermore, a preferred embodiment is provided, which also includes an operation module for performing an emergency stop operation on the test PLC module.

[0030] Furthermore, a preferred embodiment is provided in which the operation module is disposed between the analog signal conversion module and the digital signal conversion module.

[0031] Furthermore, a preferred embodiment is provided in which the following automatic detection algorithm is loaded into the test PLC module:

[0032] Based on the type of the control cabinet module to be tested, select the corresponding preset test package and perform the test steps;

[0033] The preset test package includes:

[0034] The DI32 module loop detection package involves the test system sequentially sending DO signals to each channel of the DI32 module and comparing the number of signals returned by each channel. If the number of signals matches the preset count, the channel is considered normal; otherwise, the channel is considered faulty.

[0035] The DO32 module loop detection package tests the number of signals returned by the DO32 module to each channel of the system. The system then compares these numbers with pre-designed values. If the counts match, the channel is considered normal; otherwise, the channel is considered faulty.

[0036] The AI8 module loop detection package tests the system by sending different current signals to each channel of the AI ​​module in sequence. The system then compares the signals returned by the AI ​​module with the standard signals. If the deviation is within a preset range, the channel is considered normal; otherwise, the channel is considered faulty.

[0037] The AO8 module loop detection package involves the test system sending different current signals sequentially to each channel of the AO module and comparing the signals returned by the AI ​​module with the standard signals. If the deviation is within the standard range, the channel is considered normal; otherwise, the channel is considered faulty.

[0038] Furthermore, a preferred implementation is provided, wherein the AI8 module loop detection package includes two-wire and four-wire systems. In the process of sequentially sending different current signals to each channel of the AI ​​module, an active current signal is sent to the four-wire system and a passive current signal is sent to the two-wire system.

[0039] Based on the same inventive concept, this utility model also provides a PLC automatic detection control cabinet, the device including a cabinet and an automatic detection mounting plate disposed in the cabinet.

[0040] Furthermore, a preferred embodiment is provided in which the cabinet is provided with through holes for cables to pass through, thereby enabling the electrical connection of the device.

[0041] Compared with the prior art, the advantages of the technical solution provided by this utility model are as follows:

[0042] This utility model provides an automatic PLC testing control cabinet. By automatically testing the mounting plate of the control cabinet, it automates the modular testing process of the PLC control cabinet, significantly improving testing efficiency compared to existing technologies that rely on manual operation. Existing technologies involve cumbersome and time-consuming testing processes; this utility model reduces manual steps through automatic testing, shortens testing time, and significantly reduces labor costs.

[0043] This utility model provides an automatic PLC testing control cabinet. The PLC module tester automatically identifies the type of the module under test using preset test packages and selects the appropriate test method, ensuring test accuracy. Compared to existing technologies that rely on manual setting of test programs, this avoids setting errors caused by operator negligence or fatigue, thus improving test reliability.

[0044] This invention provides a PLC automatic detection control cabinet that, through analog signal conversion modules and digital signal conversion modules, achieves automatic conversion between active and passive signals. Existing technologies require manual operation and frequent adjustments by technicians; this invention simplifies the signal conversion process, reduces operational complexity, and further reduces the incidence of human error.

[0045] This utility model provides a PLC automatic detection control cabinet. The automatic detection method automatically determines whether the channel is normal by comparing the signals returned by each module, eliminating the need for manual recording of test results. Compared with the manual recording method in the prior art, it not only improves the accuracy of the results, but also facilitates the storage and analysis of test data.

[0046] This utility model provides a PLC automatic testing control cabinet with a compact structural design. All modules are arranged sequentially on the mounting plate, reducing the space occupied by the testing equipment. Compared with the prior art, which requires more manual tools (such as multimeters, signal generators, etc.), this utility model greatly simplifies the number of testing devices and improves the convenience of testing operations.

[0047] This utility model provides a PLC automatic testing control cabinet that provides unified power to each test module through a power supply module. This utility model further improves the system's integration and stability, avoids test result errors caused by interference or instability of external power supply equipment, and enhances the reliability of the testing system.

[0048] This utility model provides a PLC automatic testing control cabinet, whose operation module also has an emergency stop function, ensuring that operation can be quickly stopped during testing and increasing system safety. This is a function generally lacking in existing technology, and can effectively prevent equipment damage or personal injury caused by emergencies or malfunctions.

[0049] This utility model provides a PLC automatic detection control cabinet, which is suitable for use in the automatic detection work of PLC control cabinets. Attached Figure Description

[0050] Figure 1 This is a front view of a PLC automatic detection control cabinet with the cabinet door removed.

[0051] Wherein, 1 represents the test PLC module, 2 represents the analog signal conversion module, 3 represents the digital signal conversion module, 4 represents the analog signal input module, 5 represents the digital signal input module, and 6 represents the operation module. Detailed Implementation

[0052] To make the advantages and benefits of the technical solution provided by this utility model clearer, the technical solution provided by this utility model will now be described in further detail with reference to the accompanying drawings. Specifically:

[0053] Implementation Method 1: This implementation method provides an automatic detection mounting plate for the control cabinet, the mounting plate comprising:

[0054] Test PLC module 1, used to provide test algorithms;

[0055] Analog signal conversion module 2 is used to convert active analog output signals into passive analog output signals;

[0056] Digital signal conversion module 3 is used to convert active digital output signals into passive digital output signals;

[0057] The analog signal input module 4 is used to receive analog input signals and send them to the test PLC module 1.

[0058] The digital signal input module 5 is used to receive digital input signals and send them to the test PLC module 1.

[0059] Implementation Method 2: This implementation method further defines the control cabinet automatic detection mounting plate provided in Implementation Method 1. The test PLC module 1, analog signal conversion module 2, digital signal conversion module 3, digital signal input module 5, and analog signal input module 4 are arranged sequentially on the mounting plate.

[0060] Implementation Method 3: This implementation method further defines the control cabinet automatic detection mounting plate provided in Implementation Method 2, and also includes a power supply module for supplying power to the test PLC module 1, analog signal conversion module 2, digital signal conversion module 3, analog signal input module 4, and digital signal input module 5.

[0061] Implementation Method 4: This implementation method further defines the automatic detection mounting plate of the control cabinet provided in Implementation Method 3, wherein the power supply module is mounted on the analog signal conversion module 2 or the digital signal conversion module 3.

[0062] Implementation Method 5: This implementation method further defines the automatic detection mounting plate of the control cabinet provided in Implementation Method 2, and also includes an operation module 6 for performing an emergency stop operation on the test PLC module 1.

[0063] Implementation Method Six: This implementation method further defines the automatic detection mounting plate for the control cabinet provided in Implementation Method Five. The operation module 6 is located between the analog signal conversion module 2 and the digital signal conversion module 3.

[0064] Implementation Method Seven: This implementation method further defines the automatic detection mounting plate for the control cabinet provided in Implementation Method One. The test PLC module 1 loads the following automatic detection algorithm:

[0065] Based on the type of the control cabinet module to be tested, select the corresponding preset test package and perform the test steps;

[0066] The preset test package includes:

[0067] The DI32 module loop detection package involves the test system sequentially sending DO signals to each channel of the DI32 module and comparing the number of signals returned by each channel. If the number of signals matches the preset count, the channel is considered normal; otherwise, the channel is considered faulty.

[0068] The DO32 module loop detection package tests the number of signals returned by the DO32 module to each channel of the system. The system then compares these numbers with pre-designed values. If the counts match, the channel is considered normal; otherwise, the channel is considered faulty.

[0069] The AI8 module loop detection package tests the system by sending different current signals to each channel of the AI ​​module in sequence. The system then compares the signals returned by the AI ​​module with the standard signals. If the deviation is within a preset range, the channel is considered normal; otherwise, the channel is considered faulty.

[0070] The AO8 module loop detection package involves the test system sending different current signals sequentially to each channel of the AO module and comparing the signals returned by the AI ​​module with the standard signals. If the deviation is within the standard range, the channel is considered normal; otherwise, the channel is considered faulty.

[0071] Implementation Method 8: This implementation method further defines the control cabinet automatic detection mounting plate provided in Implementation Method 3. The AI8 module loop detection package includes two-wire and four-wire systems. In the process of sequentially sending different current signals to each channel of the AI ​​module, an active current signal is sent to the four-wire system and a passive current signal is sent to the two-wire system.

[0072] Implementation Method Nine: This implementation method provides a PLC automatic detection control cabinet. The device includes a cabinet and an automatic detection mounting plate for the control cabinet provided in Implementation Method Seven, which is installed in the cabinet.

[0073] Implementation Method 10: This implementation method is a further limitation of the PLC automatic detection control cabinet provided in Implementation Method 9. The cabinet is provided with through holes for passing cables through to realize the electrical connection of the equipment.

[0074] Implementation Method Eleven: Combination Figure 1 This embodiment describes the technical solution provided above in further detail through specific examples. Specifically:

[0075] This embodiment provides an automatic PLC testing control cabinet for automatic control cabinet testing, aiming to solve the problems of manual operation, low efficiency, and high error rate in existing PLC testing work. The automatic PLC testing control cabinet includes: a test PLC module 1, an analog signal conversion module 2, a digital signal conversion module 3, an analog signal input module 4, a digital signal input module 5, a power supply module, and an operation module 6. These modules are arranged sequentially on a mounting plate to form a compact integrated structure.

[0076] Test PLC module 1 is used to load test algorithms, receive signals transmitted from various signal input modules, and analyze the signals according to preset test packages. The preset test packages include DI32 module loop detection packages, DO32 module loop detection packages, AI8 module loop detection packages, and AO8 module loop detection packages, which can comprehensively test the functions and loop status of each module in the PLC control cabinet.

[0077] Analog signal conversion module 2 and digital signal conversion module 3 are used to convert active analog and digital signals into passive signals, respectively, to meet different testing requirements. Analog signal input module 4 and digital signal input module 5 are used to receive analog and digital input signals from the PLC control cabinet under test and transmit them to the test PLC module 1 for analysis.

[0078] The power module provides unified power to all modules, ensuring stable system operation. Operation module 6 is used to perform emergency stop operations in case of emergencies, ensuring system safety.

[0079] Example 1: Automated Testing of DI32 Modules

[0080] In this embodiment, the test PLC module 1 is loaded with the DI32 module loop detection package for automatic testing of the 32 channels of the DI32 module. The operation steps are as follows:

[0081] Connect the DI32 module of the PLC control cabinet under test to the automatic detection mounting plate of the control cabinet via digital signal input module 5.

[0082] Start the test PLC module 1 and select "DI32 module loop detection package".

[0083] Test PLC module 1 sequentially sends DO signals to each channel of DI32 module, while monitoring the signals returned by DI32 module.

[0084] Test PLC module 1 compares the number of return signals for each channel. If the number of return signals meets the preset limit, the channel is considered normal; otherwise, the channel is considered faulty.

[0085] After all channels have been tested, the test PLC module 1 outputs the test results and generates a test report.

[0086] This embodiment avoids the process of manually testing each channel one by one, greatly improving testing efficiency and reducing the occurrence of human error.

[0087] Example 2: Automated Testing of the AI8 Module

[0088] This embodiment describes the process of automatically testing the AI8 module, applicable to analog input modules in PLC control cabinets. The operation steps are as follows:

[0089] Connect the AI8 module of the PLC control cabinet under test to the automatic detection mounting plate of the control cabinet via analog signal input module 4.

[0090] Start the test PLC module 1 and select "AI8 module loop detection package".

[0091] Test PLC module 1 sequentially sends different current signals (e.g., 4-20mA) to each channel of AI8 module and receives the signals returned by AI8 module.

[0092] The test PLC module 1 compares the signal returned by the AI8 module with the standard signal. If the deviation is within the preset range, the channel is determined to be normal; otherwise, the channel is determined to be incorrect.

[0093] An active current signal is sent to the four-wire AI8 module, and a passive current signal is sent to the two-wire AI8 module to accommodate different types of modules.

[0094] After the test is completed, the test PLC module 1 outputs the test results, records the deviation data, and generates a report.

[0095] This embodiment automatically detects current signals and compares deviations, replacing complex manual operations and improving the accuracy and efficiency of testing.

[0096] Example 3: Automated Testing of the DO32 Module

[0097] In this embodiment, the DO32 module loop detection package is used to automatically detect digital output modules in the PLC control cabinet. The operation steps are as follows:

[0098] Connect the DO32 module of the PLC control cabinet under test to the automatic detection mounting plate of the control cabinet via digital signal input module 5.

[0099] Start the test PLC module 1 and select "DO32 module loop detection package".

[0100] Test PLC module 1 sends signals to each channel of DO32 module in sequence, and compares the number of signals returned by DO32 module with the preset count value.

[0101] If the count value matches, the channel is considered normal; otherwise, the channel is considered faulty.

[0102] After the test is completed, the test PLC module 1 outputs the test results and generates a detailed test report.

[0103] This embodiment simplifies the traditional manual testing process by automating the signal transmission and comparison process, greatly improving the accuracy of the test.

[0104] The automatic detection algorithm is as follows:

[0105] Several preset test packages are provided, containing test logic for different types of PLC modules, all of which are executed automatically by the software system. The following is the test logic and process of the preset test packages, focusing on the analysis from a software perspective.

[0106] The test logic of the preset test package:

[0107] DI32 module loop detection package

[0108] Test logic: After receiving the start command, the system sequentially sends DO signals to each channel of the DI32 module. Each channel receives a signal and sends it back to the system, which compares the number of returned signals with the expected value. If the number of returned signals matches the preset number, the channel is considered normal; otherwise, the system delays and retryes. If the correct signal is still not received, the channel is marked as faulty.

[0109] Software processing: The system automatically generates and sends DO signals and receives data from the DI module. The software logic automatically performs signal comparison, records errors and retryes when an anomaly is detected, until a final judgment is made.

[0110] DO32 module loop detection package

[0111] Test logic: The system sends a signal to each channel of the DO32 module and records the returned response signal through the DI module. The system compares the number of returned signals with the pre-designed values. If the count matches, the channel is considered normal; if it does not match or the delay exceeds the specified time, the channel is considered faulty.

[0112] Software processing: The software automatically sends out DO signals and records the return signals from the DI module, performs automatic comparison, and if an error is detected, the system will immediately generate an error report without manual intervention.

[0113] AI8 (four-wire) module loop detection package

[0114] Test logic: The system sequentially sends different current signals (8mA, 12mA, 16mA, 20mA) to each channel of the AI ​​module and receives the digital signals fed back by the AI ​​module. The system compares the received signals with the standard signal. If the deviation is within the preset range, the channel is determined to be normal; if the deviation exceeds the range, it is determined that the signal accuracy is insufficient or the channel is damaged.

[0115] Software processing: The system automatically sends a current signal and records the analog-to-digital conversion result returned by the AI ​​module. The software automatically performs accuracy calculations and determines whether it meets the standard values. In case of anomalies, the system automatically marks the problematic channel.

[0116] AI8 (two-wire) module loop detection package

[0117] Test logic: Similar to the four-wire test, the difference is that the current signal emitted by the system is a passive signal; other steps are the same as the four-wire test. The system also compares the returned digital signal with the standard value and automatically generates an accuracy judgment report.

[0118] Software processing: The software system sends a passive current signal and receives feedback signals from the AI ​​module, automatically completing signal comparison and accuracy analysis.

[0119] AO8 module loop detection package

[0120] Test logic: The system sequentially sends different current signals (8mA, 12mA, 16mA, 20mA) to each channel of the AO module, and returns them to the AI ​​module via a test fixture for analog-to-digital conversion. Finally, the signal returned by the AI ​​module is compared with a standard signal. If the deviation is within the standard range, the channel is considered normal; otherwise, an anomaly is recorded.

[0121] Software processing: The system sends out a current signal and receives the feedback analog-to-digital conversion data. The software automatically performs the comparison and outputs the results.

[0122] How to select a test package:

[0123] PLC Function Module Type Selection

[0124] Operators can select the corresponding test package through the software interface based on the module type of the PLC cabinet under test. Optional test packages include DI32 module, DO32 module, AI8 (four-wire), AI8 (two-wire), and AO8 module, etc. The system loads the corresponding test logic according to the module type selected by the user.

[0125] Select by automatic detection module type

[0126] The system supports automatically identifying the module type of the PLC cabinet and recommending the corresponding test packages. By reading the PLC configuration, the software automatically matches the most suitable test logic, reducing the possibility of manual intervention and selection errors.

[0127] Loading predefined test plans

[0128] The software also supports predefined test schemes, allowing operators to directly select a complete set of test schemes suitable for a specific type of PLC cabinet, eliminating the need to select test packages one by one. The system will automatically execute tests on all modules within that scheme, ensuring completeness and efficiency.

[0129] Through these selection methods, the software ensures the automation and flexibility of testing, adapting to the testing needs of different types of modules while reducing the workload of operators.

[0130] The above description of the technical solution provided by this utility model through several specific embodiments is intended to highlight the advantages and benefits of the technical solution provided by this utility model. However, the above-described specific embodiments are not intended to limit this utility model. Any reasonable modifications and improvements to this utility model, combinations of embodiments, and equivalent substitutions based on the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An automatic detection mounting plate for a control cabinet, characterized in that, The mounting plate includes: Test PLC module to provide test algorithms; Analog signal conversion module, used to convert active analog output signals into passive analog output signals; A digital signal conversion module is used to convert active digital output signals into passive digital output signals; The analog signal input module is used to receive analog input signals and send them to the test PLC module; The digital signal input module is used to receive digital input signals and send them to the test PLC module.

2. The automatic detection mounting plate for the control cabinet according to claim 1, characterized in that, The test PLC module, analog signal conversion module, digital signal conversion module, digital signal input module, and analog signal input module are arranged sequentially on the mounting plate.

3. The automatic detection mounting plate for the control cabinet according to claim 2, characterized in that, It also includes a power supply module for supplying power to the test PLC module, analog signal conversion module, digital signal conversion module, analog signal input module and digital signal input module.

4. The automatic detection mounting plate for the control cabinet according to claim 3, characterized in that, The power supply module is located on the analog signal conversion module or the digital signal conversion module.

5. The automatic detection mounting plate for the control cabinet according to claim 2, characterized in that, It also includes an operation module for performing an emergency stop operation on the test PLC module.

6. The automatic detection mounting plate for the control cabinet according to claim 5, characterized in that, The operation module is located between the analog signal conversion module and the digital signal conversion module.

7. The automatic detection mounting plate for the control cabinet according to claim 1, characterized in that, The test PLC module is loaded with the following automatic detection algorithm: Based on the type of control cabinet module under test, select the corresponding preset test package and perform the test steps; The preset test package includes: The DI32 module loop detection package tests the system by sequentially sending DO signals to each channel of the DI32 module and comparing the number of signals returned by each channel. If the number of signals matches the preset count, the channel is considered normal; otherwise, the channel is considered faulty. The DO32 module loop detection package tests the number of signals returned by the DO32 module to each channel of the system. The system then compares these numbers with pre-designed values. If the counts match, the channel is considered normal; otherwise, the channel is considered faulty. The AI8 module loop detection package tests the system by sending different current signals to each channel of the AI ​​module in sequence. The system then compares the signals returned by the AI ​​module with the standard signals. If the deviation is within a preset range, the channel is considered normal; otherwise, the channel is considered faulty. The AO8 module loop detection package involves the test system sending different current signals sequentially to each channel of the AO module and comparing the signals returned by the AI ​​module with the standard signals. If the deviation is within the standard range, the channel is considered normal; otherwise, the channel is considered faulty.

8. The automatic detection mounting plate for the control cabinet according to claim 3, characterized in that, The AI8 module loop detection package includes two-wire and four-wire systems. During the process of sequentially sending different current signals to each channel of the AI ​​module, an active current signal is sent to the four-wire system and a passive current signal is sent to the two-wire system.

9. A PLC automatic detection control cabinet, characterized in that, The control cabinet includes a cabinet body and an automatic detection mounting plate for the control cabinet as described in claim 7, which is disposed in the cabinet body.

10. A PLC automatic detection control cabinet according to claim 9, characterized in that, The cabinet is provided with through holes for cables to pass through, enabling the electrical connection of the control cabinet.

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