The person in the thread you mention seems to connect an S7 to Mitsubishi. I don't know whether Mitsubishi somehow supports thie protocol or how he does it. Maybe you could post to this thread to get his attention.Originally Posted by Tischnoetentoet
S7 can use at least 2 protocols over TCP/IP:
1. A protocol from S5 times compatible with S5 ethernet communication Here you can find an example of FETCH/WRITE communication with a Siemens CP:
2. An S7-specific protocol that the programming software and all OPC servers I know use over both, MPI and ethernet connections.You can find my library for this protocol at:
It comes with a very rudimetary documentation of the protocol.