McConnell, David P
I am looking for practical (and cost effective) suggestions for establishing a maximally robust network inter-connection between an Allen Bradley PLC-5 ControlNet PLC and Wonderware Intouch. We currently utilize an Ethernet to interface several NT-4 workstations running the ABTCP I/O Server and Intouch. The Ethernet network consists of two hubs interconnected by fiber. Workstations are connected to the hubs via 10BaseT. The network is isolated in that nothing other than the PLC, a printer and the workstations are connected. The PLC5-80C utilizes an Ethernet sidecar (1785-ENET) for network interface and is remote from the workstations. The ControlNet network does have presence at the workstation location. Recently, at the most inconvenient moment imaginable, we experienced a hardware failure in one of the hubs. The PLC operated normally, sensed the loss of connectivity and performed an orderly shutdown of the process as programmed. However, I do not want this to happen again, ever! Any suggestions? David McConnell Boeing Company Rocketdyne Propulsion and Power Stennis Space Center, MS.