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Old September 10th, 2010, 03:29 PM   #1
harryting
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Join Date: May 2002
Location: Puget Sound
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Network Redundancy (AB), what makes sense at HMI and Rack level?

We had a discussion here internally on the best practice to do redundant network and I would like to seek some feedbacks from the experts here.

Someone suggested Ethernet/IP (simplex) and Controlnet both at the HMI level. To me, it makes more sense to do redundant E/IP instead because it's less $ and one do not have to switch over the I/O or OPC driver for the HMI project.

At the rack level, from the main PLC rack to remote I/O, I tend to perfer redundant Controlnet. Is there any good reason to consider Ethernet/IP for that?
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