6ES7231-4HF32-0XB0 SM 1231 8-Channel Analog Input Module ±10V/0-20mA | Siemens

The Original New Siemens 6ES7231-4HF32-0XB0 SIMATIC S7-1200 SM 1231 Analog Input Module is an 8-channel analog input signal module designed for high-density analog signal acquisition in S7-1200 automation systems. It converts analog voltage or current signals from field sensors and transmitters into digital values for processing by the controller. Each of the 8 differential inputs is independently configurable for voltage (±10V, ±5V, ±2.5V) or current (0-20mA, 4-20mA) ranges, providing flexible connectivity for a wide range of industrial sensors. Fully compatible with all S7-1200 CPUs.

Core Engineering Highlights:
8 differential analog inputs (voltage/current configurable) | ±10V, ±5V, ±2.5V voltage ranges | 0-20mA, 4-20mA current ranges | 12-bit + sign (13-bit ADC) resolution | 625 µs cycle time (all channels) | 24V DC rated supply voltage | 60 mA typical current consumption | 90 mA backplane bus current | 1.5 W typical power loss | 9 MΩ input impedance (voltage) | 280 Ω input resistance (current) | ±0.1% basic error limit | Wire break detection | Diagnostic alarm | IP20 protection | –40°C to +70°C operating temperature

Key Features:

• Original New Siemens 6ES7231-4HF32-0XB0 module

• 8 differential analog input channels (voltage/current configurable)

• Voltage input ranges: ±10V, ±5V, ±2.5V

• Current input ranges: 0-20mA, 4-20mA

• 13-bit resolution (12-bit + sign) with overrange capability

• 625 µs maximum cycle time for all channels

• 24V DC rated supply voltage (20.4–28.8V range)

• 9 MΩ input impedance for voltage inputs

• 280 Ω input resistance for current inputs

• 35V maximum permissible input voltage (destruction limit)

• 40mA maximum permissible input current (destruction limit)

• 1.5 W typical power loss

• 60 mA typical current consumption

• 90 mA backplane bus current

• ±0.1% basic error limit at 25°C

• ±0.2% temperature error (25°C to 55°C)

• Wire break detection per channel

• Diagnostic alarm function

• Supply voltage monitoring

• LED status indication for inputs and maintenance

• CE, CSA, UL, cULus, FM, RCM, KC, and Marine approvals

• IP20 protection for control cabinet installation

• Wide operating temperature: –40°C to +70°C

Applications:

• Analog signal acquisition from pressure, flow, level, and temperature sensors

• 4-20mA current loop signal monitoring

• Voltage signal measurement from industrial transmitters

• Process control and machine automation systems

• Data acquisition and monitoring applications

• High-density analog input expansion for S7-1200 systems

Technical Specifications:

Input Ranges:

Accuracy:

Power Supply:

Diagnostics:

Physical & Environmental:

System Compatibility:

• Siemens SIMATIC S7-1200 controllers (all CPUs)

• S7-1200 signal modules (SM) for I/O expansion

• TIA Portal engineering framework (STEP 7 Basic / Professional)

• 24V DC control systems

Typical System Architecture:
S7-1200 CPU (e.g., CPU 1214C DC/DC/DC)
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6ES7231-4HF32-0XB0 SM 1231 Analog Input Module (8 channels, 45 mm width)
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Additional S7-1200 Signal Modules (SM) / Signal Boards (SB) / Communication Modules (CM)
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Field Devices (Pressure Transmitters, Flow Meters, Level Sensors, Temperature Sensors)
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TIA Portal Engineering (STEP 7 Basic / Professional)

Related Products:

• 6ES7231-4HD32-0XB0 – SM 1231 4-channel analog input module (4AI, ±10V/0-20mA)

• 6ES7232-4HD32-0XB0 – SM 1232 4-channel analog output module (4AO)

• 6ES7234-4HE32-0XB0 – SM 1234 4AI/2AO combination module

• 6ES7214-1AG40-0XB0 – CPU 1214C DC/DC/DC (14DI/10DO/2AI)

• 6ES7274-1XF30-0XA0 – SIMATIC Memory Card for S7-1200

PLC ERA is an independent industrial automation distributor supplying 100% genuine Original New products through established global supply channels. Siemens, SIMATIC, S7-1200, and TIA Portal are trademarks of Siemens AG.