6ES7231-4HD32-0XB0 SM 1231 4-Channel Analog Input Module ±10V/0-20mA | Siemens

The Original New Siemens 6ES7231-4HD32-0XB0 SIMATIC S7-1200 SM 1231 Analog Input Module is a 4-channel analog input signal module designed for high-precision 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 4 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 (except CPU 1211C).

Core Engineering Highlights:
4 differential analog inputs (voltage/current configurable) | ±10V, ±5V, ±2.5V voltage ranges | 0-20mA, 4-20mA current ranges | 12-bit + sign resolution (13-bit ADC) | 625 µs cycle time (all channels) | 24V DC rated supply | 45 mA current consumption | 80 mA backplane bus current | 1.5 W typical power loss | ≥9 MΩ input impedance (voltage) | 280 Ω input resistance (current) | IP20 protection | –20°C to +60°C operating | 13-bit ADC for high-precision measurement

Key Features:

• Original New Siemens 6ES7231-4HD32-0XB0 module

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

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

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

• 12-bit + sign resolution (13-bit ADC) 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)

• Configurable integration time for interference suppression

• LED status indication for input status and diagnostics

• IP20 protection for control cabinet installation

• Wide operating temperature: –20°C to +60°C

• Removable terminal block for simplified wiring

• 45 x 100 x 75 mm compact form factor

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

Applications:

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

• 4-20mA current loop signal monitoring from industrial transmitters

• Voltage signal measurement from industrial sensors and transducers

• Process control and machine automation systems

• Data acquisition and monitoring applications

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

Technical Specifications:

Input Ranges:

Power Supply:

Physical & Environmental:

System Compatibility:

• Siemens SIMATIC S7-1200 controllers (all CPUs except CPU 1211C)

• 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)
↓
6ES7231-4HD32-0XB0 SM 1231 Analog Input Module (4 channels, 45 mm width)
↓
Additional S7-1200 Signal Modules (SM) / Signal Boards (SB) / Communication Modules (CM)
↓
Field Devices (Pressure Transmitters, Flow Meters, Level Sensors, Temperature Sensors)
↓
TIA Portal Engineering (STEP 7 Basic / Professional)

Related Products:

• 6ES7231-4HF32-0XB0 – SM 1231 8-channel analog input module (8AI)

• 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.