Analog output to Analog input wiring

[Fish95 0]

Dear everyone,

I've come up to a problem i need your help with.

On the job we need to transfer an analog output signal from another plc to our remote io station, a network connection is not possible.

My question is how do i connect the 2 wire 4-20mA output signal to my siemens  6ES7134-6HD01-0BA1 input card?

is this possible or do i need an isolating amplifier?

 

Thanks for your help!

[DanW 41]

The field instrument is supposed to be a 2 wire, loop powered, passive transmitter, powered by an external power supply source.

That supply power source in the input module is connected to the Uvn terminal.  (Uv = voltage supply, n = the input channel number)

DC power, by convention, connects to the transmitter's (+) terminal.

The transmitter's (-) terminal connects to the analog input (+), which for this module is (In) (current = I, n = the input channel number)

Most field instruments are 'floating' and their outputs are not grounded, so there is not likely to be excessive common mode voltage in the loop which would require an isolator.  So, no isolator.

Edited 10 Mar 2020 by DanW