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The new snap-on modules offer higher density discrete input and output capabilities, negative logic discrete, additional analog input and output options, a higher-speed counter input, and new power and segment terminals with build-in fusing and diagnostics.
LARS NITTVE: It seems that Catherine David clearly wanted to avoid the most obvious choices, and the result of this is that all decisions seem to follow a kind of negative logic.
The C-BUS (model CBQ4248G1) is available in both positive and negative logic modules and is priced at $48 for OEM quantities.