Dear Engineerds,
My Master (non siemens) doesn't see the Holding Registers of the Slave (S7-1200) plc. However the Q coils are fine and all Diagnostics don't show errors.
The Hardware:
S7-1200 – CPU 1215C
CM PtP – CB1241 RS485 (6ES7 241-1CH30-1XB0) - Half Duplex RS584
Firmware:
Modbus_Comm_Load (V3.1)
Modbus_Slave (V4.0)
I've tried with various DB, UDTs and manipulating HR_Start_offset parameter with no success. Could you advise what am I possibly missing?