Siemens 6ES7231-4HF32-0XB0 S7-1200 SM 1231 8-Channel Analog Input Module

Key specifications

Dimensions (W × H × D): 45 × 100 × 75 mm (W × H × D)
Analog input resolution: 12 bits plus sign
Input signal ranges: ±10 V, ±5 V, ±2.5 V, 0–20 mA or 4–20 mA; voltage/current selected in groups of 2 differential inputs
Power loss — published values: 1.5 W typical in Siemens article data; TIA system manual lists 2.3 W. Published figures differ; typical is not a guaranteed maximum. Confirm thermal sizing against the device documentation.
Rated supply voltage: 24 V DC

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Product name	Siemens 6ES7231-4HF32-0XB0 S7-1200 SM 1231 8-Channel Analog Input Module
Brand	Siemens
Model	6ES7231-4HF32-0XB0
Category	Industrial Automation Parts
Dimensions (W × H × D)	45 × 100 × 75 mm (W × H × D)
Analog input resolution	12 bits plus sign
Input signal ranges	±10 V, ±5 V, ±2.5 V, 0–20 mA or 4–20 mA; voltage/current selected in groups of 2 differential inputs
Power loss — published values	1.5 W typical in Siemens article data; TIA system manual lists 2.3 W. Published figures differ; typical is not a guaranteed maximum. Confirm thermal sizing against the device documentation.
Rated supply voltage	24 V DC
Dimensions — Depth	75 mm
Product description	SIMATIC S7-1200, Analog input, SM 1231, 8 AI, +/-10 V, +/-5 V, +/-2.5 V, or 0-20 mA/4-20 mA, 12 bit+sign or (13 bit ADC)
IP degree of protection	IP20
Number of analog inputs	8; Current or voltage differential inputs
Product type designation	SM 1231, AI 8x13 bit
Typical current consumption	60 mA from 24 V DC; 90 mA from the 5 V DC backplane bus
Operating temperature limits	-20…60 °C horizontal; -20…50 °C vertical