Siemens 6ES7231-4HF32-0XB0 SIMATIC S7-1200 SM 1231 AI 8x13-Bit Analog Input Module

The Siemens 6ES7231-4HF32-0XB0 is a SIMATIC S7-1200 SM 1231 analog input module with 8 channels, configurable for +/-10 V, +/-5 V, +/-2.5 V, 0-20 mA, or 4-20 mA, at 12-bit + sign (13-bit ADC) resolution. It runs on 24 V DC and draws 60 mA typical from the supply.

Technical Specifications

Certifications & Standards

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

Selection Notes

All 8 channels are software-selectable between +/-2.5 V and +/-10 V or 0/4-20 mA, so this module covers most process transmitters without hardware changes -- the 4-channel SM 1231 variant is the better fit when a station only needs half the input count and rack space is tight. A 625 microsecond cycle time across all 8 channels handles moderate-speed loops like pressure or flow; a dedicated high-speed analog module suits faster measurement needs. The basic error limit of +/-0.1% at 25C on both voltage and current ranges is tight enough for most process-monitoring loops without external calibration.

Applications

Process signal acquisition from 4-20 mA transmitters and pressure, level, or flow sensors on SIMATIC S7-1200 stations; machine monitoring and potentiometer or voltage feedback inputs.