Hello,

i have this configuration:

CPU 1214C DC/DC/DC 6ES7 214-1AG40-0XB0

CM 1241 (RS485) 6ES7 241-1CH30-0XB0

i need to send to a DCS master like 14 Word, and i need to receive from the master 3 bits, i set the comm_load instance DB the Mode 4, but this mode from the siemens manual look like only Read.

How can i red this 3 bits from the Master? Mode 4 may be its read / write?

thank you a lot for your help

Closed cause question posted twice.

The second thread with the subject S7-1200 Modbus Slave RTU is published within the conference Communication / Networks.