Communication between AC800M and BRCS for Pharmaceutical Industry
I think the real question you should be asking is WHY is a communication link "too slow" for your purpose ?
Modbus TCP over ethernet is not a slow protocol. It has very high transmission speeds and a very short turnaround time. So you can place a very large amount of information on the interface and still get pretty good transmission intervals. If Modbus TCP is too slow, then MMS and pretty much any other communication link will also be "too slow".
What specifically do you, or your customer, mean by too slow. What is the problem you are actually trying to resolve ?