Dear Mr.

I used to cpu1214 with CM1241 RS485 communication with the SOCOMEC DIRIS A20 (Modbus RTU), but an error occurred 8383, I have tried many ways but still no success. In the attached file is the project that I've done and error code. You see there is a program to send to help me.

Thank you

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Split from Modbus RTU Modbus Master

hello expert123456,

your problem has already been discussed here:

Error Code 8383 | S7-1200 | Modbus RTU Slave

CM1241 RS485 Modbus RTU Allowed Code

S7-1200 - Modbus RTU comms with third party slave

S71200 Modbus TCP Communication with SOCOMEC DIRIS A40

You will find a sample program for Modbus TCP communication here:

Sample Program: Modbus TCP with S7-1500

regards

Hi there.

If someone wants to know, when DIRIS spec says read Voltage phase U1-2 at &50514, you sould read two words at address 450515, and then you got it working fine !

Jerome