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I just took up this assignment for setting up process control which includes Controllogix PLCs RSView32 HMI. They are all linked and controlled by RS Networx. The configuration is for a complete redundant client server system. So in case one HMI server fails the other takes over. I was informed that it took a long time to work out this system. Also the team has been advised by Rockwell that they cannot use VBA codes or any other similar stuff. But my problem is that for quite a lot of functions I need to use VBA and ActiveX. What troubles are we in for? Could somebody let me know from their experiences? Also the network in general is not-so-reliable and fails often. Rockwell seems to have informed that this happens when program files are downloaded into one of the CPUs. For me that is strange. Any suggestions would be helpful Thnaks Prem