The PC and PLC are connected through RS-232, and the COM port is set to COM 1. If FXcpu is selected, the program in the PLC module cannot be read. Please tell me how to read this program.

1, see if the serial number of your PC actually connected to PLC is COM1;

2. To confirm whether the COM 1 port can communicate normally, you can short 23 pins and test whether the serial port is OK with a serial port tool (such as ComMax or Win's own super terminal).

3. Confirm whether the programming cable is in good condition.

4. Is the serial port parameter setting in the programming software consistent with the inherent setting of PLC (mainly the baud rate is generally 9600)?

5. Is there a password prompt during reading?

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