Analog input circuit 0..10V and 4-20ma

Thread Starter


Joined Jul 6, 2023
Hi to all,

I am looking for an example of circuit for PLC analog input.
One input shall have 3 terminals : Ui, Ai and Com. Ui - voltage input (0..10V) , Ai - current input (4-20mA) and Com- common. Depends of Analog input electrical connection signal will be conditioned over 12 bit A/D converter.
If someone have idea or solutions please share it for future discussion.



Joined Jan 23, 2018
Does the TS want to know how to utilize the inputs? Or how to produce them? Analog Voltage inputs on a PLCoften share one common among multiple inputs, with the common being the more negative side.
Current loop inputs (4-20 mA) may share a common connection to a loop source for several input channels, or they may even be assignable more flexibly. That is a read the book sort of challenge.


Joined Jul 18, 2013
I am looking for an example of circuit for PLC analog input.
So is this for use with a commercial PLC or self designed version?
If commercial recognized make, major companies have these modules available.
Or, is this a self designed PLC that you require to design the modules for?
Is this for a special case unique/project?