Communicating Citect Scada with Mitsubishi IQR series PLC

I have been working with the Mitsubishi iQR product, but I abandoned the internal Melsec Q driver in favour of the OPC Driver and Mitsubishi's own OPC Server OPC MX UA. This worked great.

The Melsec Q drivers are very old and do not support the larger addresses spaces the iQR supports (well outside the 16bit address range of the Melsec Q protocol).

Mitsubishi have an internal (private) protocol they use between their PLCs and their OPC server which is far more efficient in the amount of data that can be transferred in one transaction.

Hi Sir,

I'm not sure but you should try this configuration. As it is working for us with Intouch Machine Edition

In Citect:
- Use the MELSECQ protocol
- define the port using the TCP_BOARD, with special opt "-I10.10.10.1 -P1024 -T" for TCP or "-I10.10.10.1 -P1024 -U" for UDP
(10.10.10.1 is the IP address of your PLC and 1024 is the port used)

PLC side
- Create a SLMP Connection Module in the Ethernet Configuration , using connection method "SLMP", protocol "TCP" or "UDP" IP address and port to match the above