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Analog input current, voltage together.


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Hi all


Is it possible to connect current type and voltage sensor types together ? I need connect feedback from valve to my plc analog input. 

Can I connect black cable (4) to CM2 (23) and brown (1) to my Analog input 0 (21).

On Analog input 1 I have voltage type sensor. Will it work or I should use both current type sensors ?



Thank for you answers.





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  • MVP 2023

I'm guessing you're using a -TA30, not a -T30.

I don't have one of these in front of me to test, but if it's like other Unitronics analog inputs the common is not isolated and it's expecting a sourcing signal.  Your SMC is a sinking analog output, which means it's expecting to get it's power from somewhere else.  You'll need a loop isolator to connect this to the PLC.

Joe T.

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