Siemens Simatic S7-1200 G2 SM 1231 Analog input, 8AI, 14 bit ADC Part number 6ES7231-4HF50-0XB0

Product Overview

The Siemens SIMATIC S7-1200 G2 SM 1231 analog input module (6ES7231-4HF50-0XB0) provides 8 high-precision analog input channels with 14-bit resolution for accurate signal measurement. It supports both voltage (±10 V, ±5 V, ±2.5 V) and current (0–20 mA / 4–20 mA) inputs, allowing flexible integration into various industrial automation systems. Designed for compact installations, it ensures reliable analog data acquisition within the SIMATIC S7-1200 platform.

Key Features

• Analog Inputs: 8 differential channels for high-accuracy signal acquisition
• Input Ranges: ±10 V, ±5 V, ±2.5 V, 0–20 mA, 4–20 mA
• Resolution: 14-bit ADC for precise measurement
• Cycle Time: Up to 1.25 ms for all channels
• Diagnostics: Wire-break and fault detection for enhanced reliability
• Compact Design: Slim housing ideal for DIN-rail control panels
• Integration: Seamlessly integrates with SIMATIC S7-1200 CPUs and TIA Portal software
• Mounting: DIN-rail mounting for quick installation and space efficiency

Technical Specifications

• Product Series: SIMATIC S7-1200 G2 – SM 1231 Analog Input Module
• Number of Inputs: 8 differential analog channels
• Input Type: Voltage or current (selectable per channel)
• Voltage Ranges: ±10 V, ±5 V, ±2.5 V
• Current Ranges: 0–20 mA, 4–20 mA
• Resolution: 14-bit
• Supply Voltage: 24 V DC (20.4 – 28.8 V)
• Current Consumption: 45 mA typical at 24 V DC
• Backplane Bus Current: Approx. 75 mA at 5 V DC
• Power Loss: Approx. 2.5 W
• Input Impedance: ≥ 1 MΩ (voltage) / 250 Ω (current)
• Cycle Time (all channels): 1.25 ms
• Destruction Limit Voltage: Up to 35 V
• Cable Length (shielded): Up to 100 m
• Protection Class: IP20
• Operating Temperature: –20 °C to +60 °C
• Storage Temperature: –40 °C to +70 °C
• Dimensions (W × H × D): 30 mm × 125 mm × 100 mm
• Weight: Approx. 0.18 kg
• Country of Origin: China

Compliance & Certifications

• CE Marking: Complies with EU Machinery and Low Voltage Directives
• UL / cULus Certification: Approved for industrial control applications
• RoHS Compliant: Free from restricted hazardous substances
• WEEE Directive: Take-back obligations apply in applicable regions
• Export Control: ECCN EAR99 / AL N
• Product Classification: Industrial automation analog input module (Class A)

Applications

Ideal for accurate analog signal acquisition in automation and process control systems. Commonly used in machinery, manufacturing, building automation, and instrumentation for integrating sensors, transducers, and control feedback signals into SIMATIC S7-1200 PLC environments.