Siemens 6ES7231-5PD50-0XB0 SIMATIC S7-1200 SM 1231 RTD AI 4x 16-Bit PLC I/O Module

The Siemens 6ES7231-5PD50-0XB0 is a SIMATIC S7-1200 SM 1231 RTD signal module with 4 analog inputs for resistance thermometers, supporting Pt10 through Pt1000, Ni, Cu, and LG-Ni sensor types plus direct resistance measurement up to 600 ohms. Resolution is 15 bit plus sign, with 0.1 percent accuracy at 25 degrees C and a shielded cable length up to 100 m to the sensor.

Technical Specifications

Certifications & Standards

• CE
• UL
• cULus
• RCM
• KC

Selection Notes

The 4-channel RTD input and support for Pt10 through Pt1000, Ni, Cu, and LG-Ni sensor types let one module cover several probe standards without swapping hardware between projects using different temperature sensor brands. The 15-bit plus sign resolution with 0.1 percent accuracy at 25 degrees C suits closed-loop temperature control rather than simple threshold alarming. Because the integration time is parameterizable, a slower setting trades response speed for better noise rejection in electrically noisy cabinets, while a faster setting favors quick-changing process temperatures.

Applications

Temperature measurement in S7-1200-based machine and process control, including HVAC skids, extrusion and thermoforming lines, and any application using Pt100 or Pt1000 RTD probes for closed-loop temperature control.