I think I have sort it out. Set "Auto reconnect" and 3sec timeout in Master modbus. So far it works, however status of modbus modules shows that errors for timeouts occurs quite often.
Hi, I am fresh to codesys, using latest version for raspberry pi. I have two modbus RTU modules 16DI and 16DO, connected by TCP/RTU gateway. Modules and all Inputs and Outputs are added to the system, assigned variables and program starts and run without any error data is read (switches) and write (lamp outputs) and all works great. But just for 15-20m minutes later one of the modules stop exchanging data. Codesys show no error, connection seems be ok , sending request as expected but no response...