Hello,

Is it possible to connect PTC sensor to a SM 1231 AI4 x RTD ( 6ES7 231-5PD32-0XB0) module? If so how should I configure it?

Hello,

Look at the topics and manuals below:

connecting PTC to S7-1200

Manual and example:

3-Point Stepper Control with SIMATIC S7-1200/S7-1500

Manual:

SIMATIC S7 S7-1200 Programmable controller

For your question

The PTC sensor has a resistance greater than the module can measure - from 100 to 60,000 ohms (sometimes more)

On page 1416 you must see SM 1231 RTD specifications:

Technical data      SM 1231 AI 4 x RTD x 16 bit SM 1231 AI 8 x RTD x16 bit
Number of inputs 4                                             8
Type                     Module referenced RTD and Ω

That is, the module can only measure RTD sensors and resistance up to 600 ohms

For example:

Analog input module AI 4xRTD/TC 2-/3-/4-wire HF (6ES7134-6JD00-0CA1)

SIMATIC ET 200SP Distributed I/O system

This module can receive measurements from PTC sensors

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That is, in your case you need to either invent something - or change the module (the second option will be more appropriate)

Also, for a more accurate solution to your problem, you need a sensor model, and not just data that it can measure up to 90 degrees.