Hi,

I’m using a CPU S7-314C-2DP and planning to connect 8 RTDs (Pt-100) (3-wire type). I currently have an AI module: 6ES7 331-7KF02-0AB0 (SM331 AI 8x12Bit).

Can I use this module to connect the 8 RTDs, or do I need to use the specific RTD module 6ES7 331-7PF01-0AB0 (SM331 AI 8xRTD) instead? 

Hi,

generally possible. You may have a look here: SIMATIC S7-300 SM331;AI 8x12 Bit Getting Started Part 2: Voltage and PT100

Regards,

Frink