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Ok, sorry for the basic question but I hope that someone is willing to help. I've got a device with multiple voltage outputs sharing a common. My PLC input module also has a common reference (terminals are connected to the same bus). For example:
Device side
D1 = + of Signal 1
D2 = Common
D3 = + of Signal 2
PLC side
PLC1 and PLC3 are voltage input points.
PLC2 and PLC4 are connected internally.
Would it make sense to use twisted pair wiring make the following connections?
Pair 1
D1 - PLC1
D2 - PLC2
Pair 2
D3 - PLC3
D2 - PLC4
Or does the fact that the commons are connected by multiple paths cause a problem? Leaving out the D2 - PLC4 connection should still work, but I lose the noise suppression of twisted pair. I realize the question would be moot if my PLC module had channel isolation, but it doesn't.
Device side
D1 = + of Signal 1
D2 = Common
D3 = + of Signal 2
PLC side
PLC1 and PLC3 are voltage input points.
PLC2 and PLC4 are connected internally.
Would it make sense to use twisted pair wiring make the following connections?
Pair 1
D1 - PLC1
D2 - PLC2
Pair 2
D3 - PLC3
D2 - PLC4
Or does the fact that the commons are connected by multiple paths cause a problem? Leaving out the D2 - PLC4 connection should still work, but I lose the noise suppression of twisted pair. I realize the question would be moot if my PLC module had channel isolation, but it doesn't.