What module is the protection of the PLC memory set? What is the difference between protection levels 1, 2, and 3? -Solutions - Huaqiang Electronics

PESD1CAN electrostatic protection SOT23-3 24V two-way
5V, 35pF, bidirectional ESD protection diode

The startup mode of plc is set in the Protection option of the CPU module parameters.
The protection level l is protected by the key of the CPU module. When the key is in "RUN", only the "read" operation of the CPU can be performed. When the "STOP" or "RUN-P" is in progress, the CPU can be "read" and " Write "operation (no protection). The protection level 2 is protected by a password. When the user does not know the password, only the PLC-CPU "read" operation can be performed, and the data modification and program editing (write protection) cannot be performed, and the protection is independent of the key position of the CPU module. . The protection level 3 is protected by a password. When the user does not know the password, neither the data modification nor the program editing (write protection) nor the PLC-CPU "read" operation (write/read protection) can be performed. . The protection is independent of the key position of the CPU module.

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