Siemens 6ES7231-5PA30-0XB0 SIMATIC S7-1200 SB 1231 RTD Analog Input Signal Board

The Siemens 6ES7231-5PA30-0XB0 is a SIMATIC S7-1200 SB 1231 RTD signal board with one analog input for Pt100, Pt200, Pt500, or Pt1000 resistance thermometers, resolving to 15 bits plus sign. It plugs directly onto a S7-1200 CPU, drawing 24V DC at 5mA typical, and reports wire-break diagnostics through the CPU's diagnostic buffer.

Technical Specifications

Certifications & Standards

• CE
• CSA
• UL
• cULus
• FM
• RCM
• KC
• Marine

Selection Notes

The 15-bit-plus-sign resolution across Pt100 through Pt1000 ranges lets this signal board double as a general resistance-thermometer input without swapping modules if the sensor type changes on a retrofit. Because it mounts onto the CPU's signal-board slot rather than the side rack, it adds one RTD channel without consuming a signal-module rack slot — pick a full SM 1231 RTD module instead when the application needs more than one RTD channel. Wire-break diagnostics reported through the CPU's alarm system flag a disconnected sensor before it reads as a plausible-but-wrong temperature.

Applications

Adds Pt100/Pt1000 temperature sensing to a compact S7-1200 CPU for oven, chiller, motor-winding, or ambient-temperature monitoring where a full I/O rack slot isn't justified for a single channel.