I am trying to add an extra serial port to the PLC, (1 x RS232 and 2 x RS485 is not enough!!!!) this is what the Moxa 5230 is for.
I also have a Weintek MT8071iE HMI that uses modbus on the ethernet to connect to the PLC.
The PLC HMI link works fine until I try to connect from PLC to Moxa, it appears to connected but upsets the HMI PLC link, hence the original question about the timer.
Moxa is server, PLC is client and will execute a <TCPCONNECT 192.....>
which appears to work but, after about 30 minutes, it varies quite a bit, the PLC Moxa link fails without indication.
I am trying to look at messages but not getting very far, my scope is meant to decode but does not.
Update December 2022
The HMI has 1 x RS232 and 2 X RS485 which I am trying to use instead of the moxa as this link is normally very good, especially where the moxa is not connected.
The HMI serial port idea is progressing but it has it's own issues, should this method fall apart I might have to try the moxa idea again.
any thoughts on what is happening?
Cheers