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CQM1H

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Dear all, I need to monitor CQM1H plc from distances (RS 422/485) with HMI software, i've read some manual, but now i'm on problem choosing the best devices that will support it. 1. Is CQM1H-cpu51 + scb41 port 2 (RS 422) better then CQM1H-cpu21 + CQM1H-CIF12 (maybe in distances reached, speed or else) ? 2. Is K3CS better compare to 3G2A9-AL004-E (or NT-AL001) ? 3. maybe there is any configuration better than those, for future use (something like easy maintenance) ? Thank you for your kind attention

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