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What is the difference between a Modbus Plus redundant cable network and redundant networks?

A redundant cable network is a single Modbus Plus network with two connections on each node, cable A and cable B.
A redundant Modbus Plus network would be as an example of a Quantum PLC connected to two separate networks. The PLC would be connected to Network 1 and a NOM module on the same backplane connected to Network 2.