PLC fault judgment and maintenance steps

1. Fault inspection and handling of PLC input and output equipment.

Checking and dealing with input and output equipment faults is one of the main tasks of PLC system maintenance.

Inspection and processing of PLC input equipment.

Due to the on-site environment, the electrical components and connection circuits of the input equipment are most prone to failure, such as switches, contactors, sensors, etc., first, the components themselves are faulty, the contacts of switches, relays, and contactors are easy to ignite or oxidize, and there are faults of burnout or poor contact, and the output signal of the sensor is unstable or malfunctioning; The second is the fault of the connecting line, such as short circuit, open circuit, the insulation of the line is reduced and grounded, and the terminal is oxidized or corroded. Most of the above faults can be found by observation or measured with a multimeter, and the symptomatic treatment can be done.

Inspection and processing of PLC output equipment.

First of all, the actuator is switched to the "hard operation" control state, and the actuator is manually operated to observe whether the actuator can act correctly. If the "hard operation" is abnormal, check whether the electrical control part of the actuator is normal, whether the actuator is stuck, and whether the motor, relay, solenoid valve, and electric control valve are flexible. The "hard operation" is normal, and then switch to the "soft operation", and use the input signal operation to determine the fault position.

In addition to considering the factors of the device itself, it is also necessary to check whether the fault is caused by external reasons, excessive load, and the influence or damage of overcurrent caused by mechanical stagnation on the electrical contacts.

Hello, after the PLC has a buried erection fault, it is usually necessary to perform the following steps to reset:1Find out the cause of the fault and eliminate it.

This requires checking the hardware, software, I/O devices, and network connections of the PLC to determine the specific cause of the failure. 2.Confirm that the power supply to the PLC has been disconnected, wait a few minutes before reconnecting the power supply.

3.If the PLC has a reset button, press the button to reset. Some PLCs may also require the use of specific procedures and tools for reset, depending on the PLC model and manufacturer.

4.If the program memory of the PLC is already corrupted, the program needs to be rewritten and uploaded to the PLC. It is important to note that before performing the PLC reset operation, it is important to ensure that the necessary safety measures have been taken, such as turning off the relevant power switch and disconnecting the power plug, etc., to prevent accidental injury or damage to the equipment.

In addition, if you are not sure how to perform the PLC reset operation, it is recommended that you contact professional PLC technical support personnel for help and guidance. Hope it helps!

Kiss! Hello, happy to answer your <>

Pro, PLC Fault Reset Method: Reset CPU Method: Convert the operating mode switch from STOP position to MRES position and hold for at least 3 seconds until the red "STOP" LED starts to flash slowly.

Release the switch and turn the blind call switch to the MRES position again in a maximum of 3 seconds. When the "STOP" LED flashes quickly, the CPU has been reset. If the "stop" LED does not start flashing, repeat the process.

How to reset the memory: switch the operation mode switch from the STOP position to the MRES position carefully, STOPLED OFF for 1s, ON for 1S, and then OFF for 1s and then keep it on. Hope mine can help you <>

If you have any other questions, you can ask me again<>

1. After connecting the PLC to the power supply, see if the PLC power indicator is on, if it is normal, otherwise it will be damaged.

2. Connect the input signal, and the PLC output indicator light is on, then it is normal.

3. Use the computer and communication line (to ensure that the computer and communication line have no problems) and PLC connection, the communication connection is successful, it is normal, otherwise it will be damaged.

4,**A simple program, the program can be normal**, for example, **ldx00outy00 to plc, click x00, plc output point y00 is normal.

How to repair PLC+ communication failure.

Hello hello maintenance methods for PLC communication failures: 1. Check the PLC communication line to confirm that there is a normal connection between the PLC and the host; 2. Check the communication stool of the PLC system to confirm whether the communication protocol and address settings between the PLC and the host are correct; 3. Check the PLC communication line to confirm whether there is interference at the receiving and sending ends; 4. Check the PLC system software to confirm whether there are any problems such as program errors, out-of-bounds, and wrong structures in the operation of the PLC system; 5. Check the hardware of the PLC system to confirm whether there is a hardware fault inside the PLC system; 6. If the above inspection of the company cannot solve the fault, it may be that the hardware failure has occurred inside the PLC system, and the PLC system needs to be sent to the manufacturer's maintenance center for repair.