Siemens Analog Input Module

Part Number: 6ES7231-4HF32-0XB0

Product Description:
6ES7231-4HD32-0XB0 is a SIMATIC S7-1200 SM1231 analog input expansion module that provides 4 configurable analog inputs for voltage or current signals. It can measure ±10 V, ±5 V, ±2.5 V, 0–20 mA, or 4–20 mA signals from field instruments such as transmitters and sensors.

Key Features

• 4 analog input channels (voltage or current selectable)

• Supports 4–20 mA transmitters and 0–10 V sensors

• 13-bit ADC resolution for accurate measurement

• Differential inputs with noise suppression

• Compact module for DIN-rail mounting with S7-1200 PLC

Typical Applications

• Pressure transmitter (4-20 mA)

• Flow transmitter (4-20 mA)

• Temperature transmitters

• Level sensors

• Industrial process monitoring

Example PLC Configuration (S7-1200)

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2. Digital Output Modules (SM 1222)

Module	Description	Part Number
SM 1222	8 DO, 24V DC transistor	6ES7222-1BF32-0XB0
SM 1222	16 DO, 24V DC transistor	6ES7222-1BH32-0XB0
SM 1222	8 DO relay	6ES7222-1XF32-0XB0
SM 1222	16 DO relay	6ES7222-1HF32-0XB0

Used for controlling contactors, solenoid valves, relays, etc.

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3. Digital Input / Output Combined Modules (SM 1223)

Module	Description	Part Number
SM 1223	8DI / 8DO (24VDC)	6ES7223-1QH32-0XB0
SM 1223	16DI / 16DO transistor	6ES7223-1BL32-0XB0
SM 1223	16DI / 16DO relay	6ES7223-1PL32-0XB0

These modules provide mixed digital inputs and outputs in one module.

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Analog Modules

4. Analog Input Modules (SM 1231)

Module	Description	Part Number
SM 1231	4 AI (Voltage / Current)	6ES7231-4HD32-0XB0
SM 1231	8 AI (Voltage / Current)	6ES7231-4HF32-0XB0
SM 1231	4 AI High-resolution	6ES7231-5ND32-0XB0
SM 1231	4 AI Thermocouple	6ES7231-5QD32-0XB0
SM 1231	4 AI RTD	6ES7231-5PD32-0XB0

Used for 4-20 mA transmitters, 0-10V sensors, temperature sensors, etc.

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5. Analog Output Modules (SM 1232)

Module	Description	Part Number
SM 1232	2 AO (0-10V / 4-20mA)	6ES7232-4HB32-0XB0
SM 1232	4 AO	6ES7232-4HD32-0XB0

Used for controlling VFD speed reference, valve position, etc.

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6. Analog Input / Output Combined Modules (SM 1234)

Module	Description	Part Number
SM 1234	4AI / 2AO	6ES7234-4HE32-0XB0
SM 1234	2AI / 2AO (Signal board type)	6ES7234-5HD30-0XB0