The loss of the plc program is usually caused by poor grounding or incorrect wiring, incorrect operation and interference.
1. The PLC main unit and the module must have good grounding. Usually, the main unit housing and the switch cabinet housing are connected to the ground. When there is poor grounding, multi-strand copper core wire should be considered. Grounding from the main grounding terminal should be grounded to ensure good grounding. In addition, the I/O module 24V DC power supply negative terminal should be well grounded.
2. The phase line of the main power supply terminal must be connected correctly. Otherwise, the host will not start, and often the error or program loss will occur.
3. In order to prevent program loss, you need to prepare the package. A good program needs to be punched in advance for the urgent need.
4. When using the programmer to find faults. Put the lock switch in the vertical position and then pull it out to protect the memory. If you want to disconnect the PLC system power, you should first disconnect the host power supply, and then disconnect the I / O module power supply, if you first disconnect the I / 0 part of the power supply, or. When the I/O part is disconnected from the mains power supply, the program will be confused due to incorrect values ​​being stored in the power-off processing.
5. The PLC program is lost due to interference, and its processing method can refer to the processing of the fault caused by the PLC, and suppress and weaken the interference as much as possible.
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