Siemens 6ES7231-5PD32-0XB0 Analog Input Module

Siemens 6ES7231-5PD32-0XB0 Analog Input Module is a SIMATIC S7-1200 SM1231 RTD analog input card that provides four RTD input channels (4x AI RTD). Each channel delivers 16-bit resolution for precise RTD-based temperature readings across four independent sensors. The module plugs into the S7-1200 backplane and is powered from a 24 V DC supply; typical current draw is 40 mA from the backplane’s 5 V rail, with a maximum around 80 mA. As part of the SM1231 RTD family, it communicates with the CPU via the standard SIMATIC I/O bus, enabling straightforward integration into Siemens automation projects. Typical applications include temperature monitoring in manufacturing lines, process control, and environmental systems where reliable RTD measurements across multiple inputs are required. Designed to work with the broader SIMATIC line of analog input modules, engineers can pair the SM1231 RTD with other AI modules in the same system for multi-signal monitoring. Internally, RTD resistance is converted to a digital value for each channel.