Siemens 6ES7231-0HC22-0XA8 Analog Input Module | 4 AI, 13-bit

Siemens 6ES7231-0HC22-0XA8 S7-1200 analog input module. 4 channels, ±10V/0-20mA, 13-bit. For precise signal measurement.

Product: Siemens 6ES7 231-0HC22-0XA8 Analog Input Module (SM 1231)

The Siemens 6ES7 231-0HC22-0XA8 (commonly written as 6ES7231-0HC22-0XA8) is a 4-channel analog input module for the SIMATIC S7-1200 PLC system. It is designed for high-precision acquisition of standard voltage and current signals in compact automation applications.

Key Features

• Compact Design:​ Four isolated analog inputs in a compact S7-1200 form factor.

• Flexible Configuration:​ Each channel individually configurable for voltage or current input.

• High Resolution:​ 13-bit + sign bit resolution ensures measurement precision.

• Easy Integration:​ Simple wiring via removable front connector; configured in TIA Portal.

Technical Specifications

• Order Number:​ 6ES7 231-0HC22-0XA8

• Product Family:​ SIMATIC S7-1200 (SM 1231 series)

• Module Type:​ Analog Input, 4 Channels

• Input Ranges (per channel, software configurable in TIA Portal):

  • Voltage: ±10 V, ±5 V, ±2.5 V, 0 to 10 V

  • Current: 0 to 20 mA, 4 to 20 mA

• Resolution:​ 13 bits + sign

• Conversion Time per Channel:​ 625 µs (for all 4 channels)

• Basic Accuracy Error:​ Typically ±0.3% of full scale (at 25°C/77°F)

• Input Impedance:​ Voltage: ≥ 9 MΩ; Current: 250 Ω

• Electrical Isolation:​ 500 V AC between channels and backplane

• Connection:​ Via removable front connector (included)

• Power Supply:​ From S7-1200 backplane bus

• Width:​ 25 mm

• Module Code:​ 0XA8 (Internal Siemens hardware identifier)

Function

This signal module (SM) converts real-world analog signals (e.g., from pressure transmitters, temperature transmitters, or potentiometers) into a precise digital value for processing by the S7-1200 CPU. Configuration of ranges, filtering, and diagnostics is done in the Siemens TIA Portal engineering software.

Typical Applications

Used to expand the I/O of an S7-1200 PLC for:

• Process variable monitoring (level, pressure, flow)

• Machine control requiring analog feedback

• Simple closed-loop control tasks

• Data acquisition from analog sensors

Important Note

This is a standard analog input module for voltage/current signals. It is not​ suitable for direct connection of resistance-based sensors (like RTDs) or thermocouples. Ensure the analog sensors in your application match the configurable input ranges. The required front connector is included with the module.

Note: Specifications are for product identification and comparison. For full technical data, wiring diagrams, and configuration steps, consult the official Siemens S7-1200 system manual and module data sheet.

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