Siemens 6ES7231-5ND32-0XB0 SIMATIC S7-1200 SM 1231 AI 4x16bit 0-20mA/+-10V PLC I/O Module

The Siemens SIMATIC S7-1200 SM 1231 (6ES7231-5ND32-0XB0) is a 4-channel analog input module resolving 15 bits plus sign, accepting voltage ranges from +/-1.25 V up to +/-10 V or current ranges of 0-20 mA and 4-20 mA. It runs from a 24 V DC supply at 65 mA typical, includes wire-break diagnostics, and carries an IP20 rating for cabinet mounting.

Technical Specifications

Certifications & Standards

• CE
• CSA
• UL
• cULus
• FM
• RCM
• KC
• Marine

Selection Notes

With 15-bit-plus-sign resolution and a 100 microsecond cycle time across all channels, this module suits process signals needing fine granularity, such as pressure transmitters on the 4-20 mA range, rather than simple on/off sensing. The four independently configurable voltage and current ranges mean one module can mix sensor types on a single S7-1200 station instead of stocking separate voltage-only and current-only cards. Diagnostic alarm and wire-break detection are active per channel, useful when the loop must flag a disconnected sensor rather than reading a false zero.

Applications

Used for reading process transmitters, such as pressure, level, and flow transmitters with 4-20 mA output, and precision voltage signals into a SIMATIC S7-1200 station in small to mid-size machine and process control panels.