> Now I'm hearing
> that they're expecting to communicate with a PLC, so
> I'm a bit concerned that the ME won't be able to cut
Why's that likely to be a problem?
We're using protocols very similar to Modbus over Ethernet, and on the ME9210 are getting something like 500-600 messages/second from a single TCP/IP socket without any effort at optimisation. Use three separate PCs to poll the device, and aggregate rate is a bit more - around 700-800 messages/second.
All without noticeable effect on other things.