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-   -   Network Redundancy (AB), what makes sense at HMI and Rack level? (http://www.plctalk.net/qanda/showthread.php?t=57943)

harryting September 10th, 2010 04:29 PM

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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