INTERFACING A PT100 SENSOR WITH SIMATIC S7-1200

I NEED TO INTERFACE A 2-WIRE PT100 TEMPERATURE SENSOR USING THE 2 ANALOG INPUTS ON S7-1200 AND I DON'T KNOW HOW TO WIRE IT ON THE PLC, BECAUSE THE ANALOG INPUTS SUPPORTS 0V TO 10V AND THE POWER SUPPLY I HAVE SUPPLIED 24V…   

I APPRECIATE ANY HELP HERE !

Hello Yaya-Lzz;

A PT 100 is a RTD (resistance temperature detector) and it produces mV signals corresponding to a resistance change de to the measured temperature. For more details, read the following articcle, but understamd that you cannot use a standard 0-10V analog input range in your PLC to read the RTD output:

https://www.te.com/usa-en/industries/sensor-solutions/insights/understanding-rtds.html

You have two choices, as I see it:

- connect a 0-10V transmitter between the PT 100 and the S7-1200 analog input connections:

https://www.google.ca/search?q=pt100+0-10V+transmitter&tbm=isch&ved=2ahUKEwi--POguY_4AhXlsHIEHdOZAeIQ2-cCegQIABAA

- insert a PT 100 signal board (6ES7231-5PA30-0XB0) or a PT 100 signal module (6ES7231-5PD32-0XB0) in your S7-1200, these are designed to read signals from a PT 100.

Hope this helps,

Daniel Chartier