Communication error recovery device and method for each part set of multifunctional conveying belt production line

Abstract

The invention discloses a communication error recovery device and method for each part of a multifunctional conveying belt production line, the multifunctional conveying belt production line comprises a main PLC and at least one sub-PLC, and each part communication error recovery device comprises a signal receiving unit, a relay isolation output unit and a main control unit, the signal receiving unit is used for receiving a first digital signal output by the sub-PLC and a second digital signal output by the main PLC; the relay isolation output unit is used for executing cold start operation on the main PLC; and after the main control unit judges the first digital signal and the second digital signal, the main control unit controls the relay isolation output unit to execute cold start operation on the main PLC according to a judgment result so as to eliminate communication errors.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multifunctional conveyor belt production, in particular to a communication error recovery device and method for each part of a multifunctional conveyor belt production line. BACKGROUND

[0002] The function of the flat vulcanization production line is to manufacture conveyor belt products. The multifunctional flat vulcanization production line can be used to manufacture steel cord or fabric core conveyor belts. A typical multifunctional flat vulcanization production line includes the following parts: a spool holder, a tension station, a front guide opening, a forming car, a main machine, a belt pulling machine, and a double land roll / active winding. The existing flat vulcanization production line adopts a multi-PLC scheme according to the functions and electrical load characteristics of each part. Specifically, the spool holder, the tension station, and the front guide opening are controlled by one sub-PLC, the forming car is controlled by one sub-PLC, the main machine is controlled by one sub-PLC, and the belt pulling machine and the double land roll / active winding are controlled by one sub-PLC, totaling four sub-PLCs. The advantage of this design is that it is modular and easy to undertake modification projects, greatly reducing the workload of design changes.

[0003] However, in actual use, it is found that the multi-PLC scheme has the problem of occasional PLC communication errors, especially the uncommunicable error between PLCs. The only way to reset and solve this problem is to power off and power on the main PLC. Although there is an instruction manual, it is still difficult for the operators to troubleshoot the problem, especially when they cannot understand how to determine the simple CPU communication error. This leads to prolonged downtime or reduces labor productivity by replacing the automatic operation with manual operation.

[0004] Therefore, there is an urgent need to develop a communication error recovery device and method for each part of a multifunctional conveyor belt production line that overcomes the above-mentioned defects. SUMMARY

[0005] The present application relates to a communication error recovery device for each part of a multifunctional conveyor belt production line, wherein the multifunctional conveyor belt production line includes a main PLC and at least one sub-PLC. The communication error recovery device for each part includes: a signal receiving unit electrically connected to the main PLC and the sub-PLC, the signal receiving unit being configured to receive a first digital signal output by the sub-PLC and a second digital signal output by the main PLC; a relay isolation output unit electrically connected to the main PLC, the relay isolation output unit being configured to perform a cold start operation on the main PLC; A main control unit is electrically connected to the signal receiving unit and the relay isolation output unit. After the main control unit judges the first digital signal and the second digital signal, the main control unit controls the relay isolation output unit to perform a cold start operation on the main PLC according to the judgment result to eliminate communication errors.

[0006] The communication error recovery device, wherein the main control unit is configured to: When the second digital signal is received and the first digital signal is not received, the main control unit is inaction; When the first digital signal is received and the second digital signal is not received, the main control unit outputs a control instruction to the relay isolation output unit, and the relay isolation output unit performs a cold start operation on the main PLC.

[0007] The communication error recovery device, wherein the relay isolation output unit comprises a first relay electrically connected to the main control unit, the first relay having two isolated contacts, one of which is a normally closed contact and the other of which is a normally open contact, the first relay comprising a POWER-IN terminal and a POWER-OUT terminal, and the normally closed contact being electrically connected to the power supply path of the main PLC through the POWER-IN terminal and the POWER-OUT terminal. The first relay is configured to: When the main control unit is inaction, the POWER-IN terminal and the POWER-OUT terminal are always in a conductive state, and the normally closed contact continuously conducts the power supply path of the main PLC to supply power to the main PLC; When the cold start operation is performed on the main PLC, the first relay opens the normally closed contact according to a first control instruction to disconnect the POWER-IN terminal and the POWER-OUT terminal to cut off the power supply path of the main PLC, and then the first relay closes the normally closed contact according to a second control instruction to close the POWER-IN terminal and the POWER-OUT terminal to restore the power supply path of the main PLC to continue to supply power to the main PLC.

[0008] The communication error recovery device, wherein when the first digital signal is received and the second digital signal is not received, the main control unit outputs a first control instruction to the first relay; when the normally closed contact is opened, the normally open contact is closed, the first relay outputs a feedback signal to the main control unit through the normally open contact, and the main control unit outputs the second control instruction to the first relay after a first predetermined time according to the feedback signal.

[0009] The communication error recovery device of each part set further comprises a cold start operation setting unit electrically connected to the master control unit, and the cold start operation setting unit is configured to set an upper limit value of the number of cold start operations.

[0010] The communication error recovery device of each part set further comprises a cold start operation setting unit electrically connected to the master control unit, and the cold start operation setting unit is configured to set an upper limit value of the number of cold start operations. The master control unit is configured to record the number of current cold start operations in real time. When the number of current cold start operations reaches the upper limit value of the number of cold start operations or the communication error is eliminated, the master control unit stops outputting the control instruction. When the master control unit does not receive the feedback signal, the master control unit stops outputting the control instruction and enters a locked state. When the master control unit receives the feedback signal and after a first preset time, the master control unit outputs the second control instruction, and after a second preset time after the master control unit outputs the second control instruction, the master control unit performs the next round of cold start operation.

[0011] The communication error recovery device of each part set further comprises a cold start operation setting unit electrically connected to the master control unit, and the cold start operation setting unit is configured to set an upper limit value of the number of cold start operations.

[0012] The communication error recovery device of each part set further comprises a cold start operation setting unit electrically connected to the master control unit, and the cold start operation setting unit is configured to set an upper limit value of the number of cold start operations.

[0013] The communication error recovery device of each part set further comprises a cold start operation setting unit electrically connected to the master control unit, and the cold start operation setting unit is configured to set an upper limit value of the number of cold start operations.

[0014] The application further provides a communication error recovery method for a multifunctional conveyor belt production line, wherein the multifunctional conveyor belt production line comprises a master PLC and at least one sub-PLC, the communication error recovery method is applied to the communication error recovery device of any one of claims 1-9, and the communication error recovery method comprises the following steps: Receiving the first digital signal output by the sub-PLC and the second digital signal output by the master PLC; Judging the first digital signal and the second digital signal; According to the judgment result, performing cold start operation on the master PLC to eliminate the communication error.

[0015] The present application is directed to the prior art, and the effect is that: 1. The present application adopts a combination of software and hardware to automatically recover communication errors, and the rated operating current of the PLC power supply side reaches 20A, which can fully meet the power supply needs of various PLCs at present, and helps to improve the safety and production efficiency of the production line; 2. The OFF-ON operation control core of the present application is based on an STM32 single-chip microcomputer and is independent of the PLC, and the device uses the normally closed point of an electromagnetic relay, so the power supply reliability is high, and even if the device fails, it only loses the ability to perform the OFF-ON operation, and has no effect on the operation of the PLC. Moreover, from the action logic of the device, it can be known that it is not limited to communication errors, and as long as the judgment is met, the action can be output, and there is development potential for other application scenarios in the future.

[0016] 3. The present application is directed to the automation of modular construction, which allows the non-participating set to be directly closed without misoperation according to different production processes, and is provided with operation frequency hardware limitation, manual operation and reset functions, which not only improves safety, but also saves energy and reduces consumption, so that rapid switching of products and reduction of errors and omissions become a reality. BRIEF DESCRIPTION OF DRAWINGS

[0017] The various embodiments proposed in the present application will be described in detail with reference to the following drawings, wherein the same numbers indicate the same components, and wherein: Figure 1 is a structural block diagram of the communication error recovery device for each set according to the present application.

[0018] Figure 2 is a front view of the communication error recovery device for each set according to the present application.

[0019] Figure 3 is a bottom view of the communication error recovery device for each set according to the present application.

[0020] Figure 4 is a top view of the communication error recovery device for each set according to the present application.

[0021] Figure 5 is a flowchart of the communication error recovery method for each set according to the present application. DETAILED DESCRIPTION

[0022] Please refer to Figures 1-4 , Figure 1 is a structural block diagram of the communication error recovery device for each set according to the present application; Figure 2 is a front view of the communication error recovery device for each set according to the present application; Figure 3 is a bottom view of the communication error recovery device for each set according to the present application; Figure 4Figure 1 is a top view of a communication error recovery device according to the present application. As shown in Figures 1-4 The communication error recovery device 1 for a multi-functional conveyor belt production line according to the present application includes a signal receiving unit 11, a relay isolation output unit 12, a main control unit 13 and a power supply unit 14. The signal receiving unit 11 is electrically connected to the main PLC 2 and the sub-PLC 3. The signal receiving unit 11 is configured to receive a first digital signal output by the sub-PLC 3 and a second digital signal output by the main PLC 2. The relay isolation output unit 12 is electrically connected to the main PLC 2. The relay isolation output unit 12 is configured to perform a cold start operation on the main PLC 2. The main control unit 13 is electrically connected to the signal receiving unit 11 and the relay isolation output unit 12. The main control unit 13 is configured to determine the first digital signal and the second digital signal. The main control unit 11 is configured to control the relay isolation output unit 12 to perform a cold start operation on the main PLC 2 to eliminate communication errors according to the determination result. The power supply unit 14 is electrically connected to the main control unit 13. The power supply unit 14 is configured to provide power for the main control unit 13. In the embodiment, the main control unit 13 is configured to be inactivated when the second digital signal is received and the first digital signal is not received. The main control unit 13 is configured to output a control instruction to the relay isolation output unit 12 when the first digital signal is received and the second digital signal is not received. The relay isolation output unit 12 is configured to perform a cold start operation on the main PLC 2.

[0023] In the embodiment, the signal receiving unit 11 has an optical coupling isolation function. The control end (e.g. PLC) and the controlled end (e.g. motor) are physically separated to avoid strong current from entering the weak current system. The signal receiving unit 11 includes a signal receiving circuit 111 and terminals DI1, DI2, DI3 and SS. DI1 is connected to the output point of the independent sub-PLC 3. DI2 is connected to the signal output end of the main PLC 2. SS is the input common end.

[0024] In the embodiment, the main control unit 13 is an STM32 single-chip microcomputer. The power supply unit 14 converts DC 24V power into DC 3.3V power which can be used by the STM32 single-chip microcomputer through a DC-DC isolation voltage stabilizing power supply module.

[0025] It should be noted that the program in the device of the application has been burned in the STM32 single-chip microcomputer, and after mass production, only the PLC program needs to be modified to make the independent PLC controller of each part of the multifunctional conveying belt production line equipped with the DI point of the output point access device. When the PLC except the host computer is in the power-on running state, the output point is connected, and if the corresponding simple CPU communication link is not communicable, it is determined that the host PLC needs to be cold started (OFF-ON, i.e. power off and then power on) operation.

[0026] Further, the relay isolation output unit 12 comprises a first relay 121 electrically connected to the main control unit 13, the first relay 121 having two-way isolation contacts, namely one normally closed contact and one normally open contact, the normally closed contact being electrically connected to the power supply path of the main PLC 2; the first relay 121 comprises a POWER-IN terminal and a POWER-OUT terminal electrically connected to the normally closed contact, and utilizes one normally closed contact and another normally open contact, wherein the normally closed contact is electrically connected to the power supply path of the main PLC through the POWER-IN terminal and the POWER-OUT terminal; the other normally open contact is used for the first relay 121 to output a feedback signal; wherein the first relay 121 is configured such that when the main control unit is inactive, the POWER-IN terminal and the POWER-OUT terminal are always in a conducting state, and the normally closed contact continuously conducts the power supply path of the main PLC to supply power to the main PLC; when the cold start operation is performed on the main PLC, the first relay is electrically attracted according to the first control instruction, that is, the normally closed contact is disconnected to disconnect the POWER-IN terminal and the POWER-OUT terminal to cut off the power supply path of the main PLC, and then the first relay is electrically disconnected according to the second control instruction, the normally closed contact is closed to close the POWER-IN terminal and the POWER-OUT terminal to restore the power supply path of the main PLC to continue to supply power to the main PLC.

[0027] When the first digital signal is received and the second digital signal is not received, the main control unit 13 outputs a first control instruction to the first relay; when the normally closed contact is disconnected, the normally open contact is closed, the first relay 121 outputs a feedback signal to the main control unit 133, and the main control unit 13 outputs the second control instruction to the first relay 121 after a first preset time according to the feedback signal.

[0028] Specifically, the contact capacity 20A of the relay isolation output unit 12 is an 8-pin two-way structure, the POWER-IN terminal and the POWER-OUT terminal are connected to the PLC power supply terminal and the PLC power supply terminal respectively, which are normally closed terminals, and the rated current is 20A. The application utilizes one normally closed point to connect the POWER-IN and POWER-OUT terminals, and the other normally open point as a closed-loop feedback signal input. When the device is not in action, the POWER-IN and POWER-OUT terminals are always in the on state, and when the OFF-ON operation is performed, the armature of the first relay 121 is first attracted, the POWER-IN terminal and the POWER-OUT terminal are disconnected, the power supply to the main PLC 2 is interrupted, and the other normally open point is turned on. The STM32 single-chip microcomputer receives the closed-loop feedback to determine that the OFF-ON action is correctly performed, and after a delay, the POWER-IN and POWER-OUT terminals are restored to the on state to continue supplying power to the main PLC 2. If the closed-loop control does not receive the feedback signal, the main control unit 13 determines that the relay fails to perform the cold start operation, and directly triggers the second relay DQ to be attracted, so that the device does not perform the cold start operation again, and the DQ indicator light 185 of the state indication unit 18 flashes to indicate that the device is in error.

[0029] In this embodiment, the second relay DQ includes terminals NO, NC, and COM. The second relay DQ is an output signal relay with a rated current of 10A. If the device still cannot eliminate the simple communication error after performing the OFF-ON operation for a certain number of times, the device will not perform the OFF-ON operation again. The output signal relay NO is connected to the COM terminal, and the NC terminal is disconnected from the COM terminal. The DQ indicator light is always on.

[0030] In this embodiment, the power supply unit 14 includes a power supply circuit 141 and power supply terminals 24V+, 24V-, and PE. The power supply terminals 24V+, 24V-, and PE are used to connect a DC 24V power supply to supply power to the main control unit.

[0031] Furthermore, the communication error recovery device 1 further includes a cold start operation setting unit 15 electrically connected to the main control unit 13. The cold start operation setting unit 15 is used to set an upper limit value of the cold start operation number. The main control unit is further configured to: record the current cold start operation number in real time; when the current cold start operation number reaches the upper limit value of the cold start operation number or the communication error has been eliminated, the main control unit stops outputting the control instruction; when the main control unit does not receive the feedback signal of the first relay action, the main control unit stops outputting the control instruction and enters a locked state; and when the main control unit receives the feedback signal, the main control unit outputs the second control instruction after a first preset time, and the main control unit outputs the second control instruction after a second preset time to perform the next round of cold start operation.

[0032] In the embodiment, the cold start operation setting unit 15 is a dial switch, which is used to set the upper limit of the number of OFF-ON operation execution operations. Specifically, the dial switch is used to limit the number of OFF-ON operations to prevent the device from determining that the simple CPU communication error is simple and then performing the operation to cause the automatic production line to fall into a dead loop and be unable to work, and the number of times of automatic OFF-ON operations of the device exceeding the limit of the dial switch is determined as a recovery failure. At this time, the device will not automatically perform the OFF-ON operation again, the DQ indicator light is always on, and the second relay DQ is attracted to perform fault prompting. However, in order to facilitate the user to quickly recover after excluding the automatic production line fault, the device allows manual execution of the OFF-ON operation. The device will not exit the locked state without performing the RESET reset operation.

[0033] Further, the communication error recovery device 1 further comprises a cold start manual control unit 16 electrically connected to the signal receiving unit 11, and outputs a manual control signal to the main control unit 13 through the cold start manual control unit 16. The main control unit 13 is configured to output the first control instruction according to the manual control signal.

[0034] In the embodiment, the cold start manual control unit 16 is a jog button switch electrically connected to the terminal DI3, which is used to manually control the device to execute the OFF-ON operation of the POWER-IN terminal and the POWER-OUT terminal. The manual operation will not be recorded in the number of OFF-ON operation executions, and it is usually recommended to be left hanging.

[0035] Further, the communication error recovery device 1 further comprises a reset unit 17 and a state indication unit 18. The reset unit 17 is electrically connected to the main control unit 13 and outputs a reset signal to the main control unit 13 through the reset unit 17 to release the locked state. The state indication unit 18 is electrically connected to the main control unit 13, and the state indication unit 18 is configured to display the current state of the device according to the indication signal output by the main control unit 13.

[0036] It should be noted that the lock state refers to the state of the device after the "relay closed loop control without feedback" and the "error after exceeding the number of dial switch settings" without resetting by holding the RESEST for more than 5 seconds. The lock state is set to protect the automatic production line and prevent accidental power failure, which does not record device errors and prompts users to miss maintenance. Among them, the relay closed loop control without feedback refers to the relay isolation output, the contact capacity is 20A, and the structure is 8-pin two-way. The device uses one of the normally closed points to connect the POWER-IN and POWER-OUT terminals, and the other normally open point as a closed loop feedback DI input. By comparing the output command and DI input, the closed loop control is performed. When the execution output command does not receive the DI input signal, it is determined that the isolation relay cannot be effectively attracted and damaged. The device is locked, the DQ indicator light flashes, and the second relay DQ is attracted to indicate the fault.

[0037] In this embodiment, the reset unit 17 is a RESET button set in the pin hole. If it is necessary to release the lock state, the card needle can be used to hold the RESET button in the pin hole for 5 seconds. The device is reset successfully, the second relay DQ is not attracted, and the device can still be put into operation again.

[0038] In this embodiment, the state indication unit 18 includes a POWER indicator light 181, a DI1 indicator light 182, a DI2 indicator light 183, a DI3 indicator light 184, and a DQ indicator light 185.

[0039] The working process of the present application is described below in combination with specific embodiments as follows: 1. After the device is installed, the main PLC is powered on, and the simple CPU communication is connected. At this time, the communication state is read in the host PLC program. This is a software component of the device. When all simple CPU communication links are in normal communication state, the main PLC outputs the second digital signal, and the output point of the independent sub-PLC 3 equipped in each part of the multifunctional conveying belt production line is connected in series with DI1 and SS. The sub-PLC 3 outputs the first digital signal. Among them, the program of the internal STM32 single-chip microcomputer of the device starts to run after the device is powered on, and initialization operation is performed. After the device RESET button is pressed for 5 seconds, the STM32 single-chip microcomputer of the device will restart and also perform initialization self-checking. The initialization self-checking is the self-checking program of STM32, which checks the single-chip microcomputer CPU, SRAM, Flash and clock. The self-checking is completed by calling the API of the X-CUBE-CLASSB function safety library provided by ST. The self-checking is passed, which means that the self-checking program runs normally. The device passes the self-checking, and is not in the lock state according to the STM32 single-chip microcomputer program, and can operate normally. If the self-checking of the device does not pass, the POWER indicator light and the DQ indicator light will flash alternately to indicate a hardware fault.

[0040] 2. After the main PLC initialization is complete, if there is no simple CPU communication error, terminals DI2 and SS will be connected, and the equipment will not operate. If there is a simple CPU communication error, the equipment will not execute the main PLC's OFF-ON action if terminals DI2 and SS are connected, but terminals DI1 and SS are not connected. This is because the product's purpose is to ensure the safety and correctness of the entire line's linkage; the automatic program will not execute when the component is powered off. If there is a simple CPU communication error and terminals DI2 and SS are not connected, but terminals DI1 and SS are connected, then an OFF-ON action is required. The POWER-IN and POWER-OUT contacts are disconnected for 5 seconds, then reconnected and cooled for 5 seconds. This process constitutes a complete OFF-ON action, and the equipment will automatically record the number of executions. The equipment will not continue to operate after the communication error is cleared or the upper limit of the DIP switch setting is reached. When the OFF-ON action reaches the upper limit of the DIP switch setting, the NO terminal of the output signal relay will be connected to the COM terminal, and the NC terminal will be disconnected from the COM terminal. If the device performs an OFF-ON operation but the closed-loop control does not receive a conduction signal, it is determined that the relay failed to perform the OFF-ON action. This will directly trigger the second relay DQ to engage, and the device will no longer perform an OFF-ON operation. Simultaneously, the DQ indicator light will flash to indicate a device malfunction. Even if the device is powered off after the second relay DQ outputs conduct, it will retain this state, known as the locked state. Upon power-up, NO and COM will still engage. Devices that enter a locked state due to reaching the upper limit of the DIP switch setting will only be reset and put back into use when the simple CPU communication is deemed normal, restoring their ability to perform OFF-ON actions. For safety reasons, devices that reach the upper limit of the DIP switch setting will no longer perform OFF-ON actions after reaching this limit, but manual OFF-ON actions can still be performed via the DI3 and SS terminals without limit on the number of times. Devices that enter a locked state due to the relay failing to perform an OFF-ON action will not perform an OFF-ON operation even if the DI3 and SS terminals are engaged.

[0041] Please refer to Figure 5 , Figure 5 This is a flowchart illustrating the communication error recovery method for each component according to the present invention. Figure 5 As shown, the present invention provides a method for recovering communication errors in various components of a multi-functional conveyor belt production line, characterized in that the multi-functional conveyor belt production line includes a main PLC and at least one sub-PLC, and the method for recovering communication errors in various components is applied to the aforementioned communication error recovery device for various components, the method for recovering communication errors in various components including: Step S1: Receive the first digital signal output by the sub-PLC and the second digital signal output by the main PLC; Step S2: judging the first digital signal and the second digital signal; Step S3: performing a cold start operation on the main PLC according to the judging result to eliminate communication errors.

[0042] In summary, the application fully considers the power consumption of different PLCs of various brands, and has sufficient load margin. It can automatically operate without manual operation, greatly reduces the communication error repair time on site, and improves the robustness of full-line automatic linkage production.

[0043] Although the application is disclosed as above with the above-mentioned embodiments, it is not intended to limit the application, and any person skilled in the relevant art can make some changes and modifications without departing from the spirit and scope of the application. Therefore, the patent protection scope of the application shall be subject to the protection scope of the claims attached to the application.

Claims

1. A communication error recovery device for various components of a multi-functional conveyor belt production line, characterized in that, The multi-functional conveyor belt production line includes a main PLC and at least one sub-PLC, and the communication error recovery device for each component includes: A signal receiving unit is electrically connected to the main PLC and the sub-PLC. The signal receiving unit is used to receive a first digital signal output by the sub-PLC and a second digital signal output by the main PLC. A relay-isolated output unit is electrically connected to the main PLC, and the relay-isolated output unit is used to perform a cold start operation on the main PLC; The main control unit is electrically connected to the signal receiving unit and the relay isolation output unit. After judging the first digital signal and the second digital signal, the main control unit controls the relay isolation output unit to perform a cold start operation on the main PLC to eliminate communication errors based on the judgment result.

2. The communication error recovery device for each component as described in claim 1, characterized in that, The main control unit is configured as follows: When the second digital signal is received but the first digital signal is not received, the main control unit does not perform any action; When the first digital signal is received but the second digital signal is not received, the main control unit outputs a control command to the relay isolation output unit, and the relay isolation output unit performs a cold start operation on the main PLC.

3. The communication error recovery device for each component as described in claim 2, characterized in that, The relay isolation output unit includes: a first relay electrically connected to the main control unit. The first relay has two isolation contacts, one of which is a normally closed contact and the other is a normally open contact. The first relay also includes a POWER-IN terminal and a POWER-OUT terminal. The normally closed contact is electrically connected to the power supply path of the main PLC through the POWER-IN terminal and the POWER-OUT terminal. The first relay is configured as follows: When the main control unit is not in operation, the POWER-IN terminal and the POWER-OUT terminal are always in a conducting state, and the power supply path of the main PLC is continuously connected through the normally closed contact to supply power to the main PLC; When a cold start operation is performed on the main PLC, the first relay opens the normally closed contact according to the first control command, causing the POWER-IN terminal and the POWER-OUT terminal to disconnect and cut off the power supply path of the main PLC. Then, the first relay closes the normally closed contact according to the second control command, causing the POWER-IN terminal and the POWER-OUT terminal to close and restore the power supply path of the main PLC, so that the main PLC continues to be powered.

4. The communication error recovery device for each component as described in claim 3, characterized in that, When the first digital signal is received but the second digital signal is not received, the main control unit outputs a first control command to the first relay; when the normally closed contact is opened, the normally open contact closes, and the first relay outputs a feedback signal to the main control unit through the normally open contact. After a first preset time, the main control unit outputs the second control command to the first relay based on the feedback signal.

5. The communication error recovery device for each component as described in claim 4, characterized in that, It also includes a cold start operation setting unit, which is electrically connected to the main control unit. The cold start operation setting unit is used to set the upper limit value of the number of cold start operations.

6. The communication error recovery device for each component as described in claim 5, characterized in that, The main control unit is also configured to: Real-time recording of the current number of cold start operations; When the current number of cold start operations reaches the upper limit of the number of cold start operations or the communication error has been eliminated, the main control unit will no longer output the control command; When the main control unit does not receive the feedback signal, the main control unit will no longer output the control command and will enter a locked state. After receiving the feedback signal, the main control unit outputs the second control command after a first preset time. After outputting the second control command, the main control unit performs the next cold start operation after a second preset time.

7. The communication error recovery device for each component as described in claim 6, characterized in that, It also includes a cold start manual control unit, which is electrically connected to the signal receiving unit. The cold start manual control unit outputs a manual control signal to the main control unit, and the main control unit is configured to output the first control command according to the manual control signal.

8. The communication error recovery device for each component as described in claim 7, characterized in that, It also includes a reset unit, which is electrically connected to the main control unit. The reset unit outputs a reset signal to the main control unit to release the locked state.

9. The communication error recovery device for each component as described in claim 7, characterized in that, It also includes a status indicator unit electrically connected to the main control unit, the status indicator unit being configured to display the current status of the device based on the indicator signal output by the main control unit.

10. A method for recovering communication errors in various components of a multi-functional conveyor belt production line, characterized in that, The multi-functional conveyor belt production line includes a main PLC and at least one sub-PLC. The communication error recovery method for each component is applied to the communication error recovery device for each component as described in any one of claims 1-9. The communication error recovery method for each component includes: Receive the first digital signal output by the sub-PLC and the second digital signal output by the main PLC; The first digital signal and the second digital signal are judged; Based on the judgment result, a cold start operation is performed on the main PLC to eliminate communication errors.

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