Siemens SIMATIC S7-1200 SM 1231 Analog Input Module 8 RTD 6ES7231-4HF32-0XB0

The Siemens SIMATIC S7-1200 SM 1231 is a high-performance analog input module designed for precise temperature measurement using RTD sensors. This module offers 8 analog inputs with 15-bit resolution and supports a wide range of RTD types including Pt100, Pt1000, Ni100, and Cu10. It features integrated diagnostics for wire break and short circuit, ensuring reliable operation in industrial environments. The module is compatible with the SIMATIC S7-1200 PLC series and mounts easily on a DIN rail.

Advantages

High accuracy with ±0.1% basic error limit, fast conversion time of 100 ms per channel, and robust isolation between channels and backplane. Supports 2-wire, 3-wire, and 4-wire RTD connections for flexible installation.

Suitable for

• Industrial temperature monitoring and control systems
• Process automation in manufacturing and chemical industries
• HVAC and building automation applications
• Machine building and plant engineering

Key specifications

• Module Type: Analog Input Module
• Number of Inputs: 8
• Input Type: RTD
• Resolution: 15 bits + sign
• Supported RTD Types: Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni200, Ni500, Ni1000, Cu10, Cu20, Cu50, Cu100
• Temperature Measuring Range (Pt100): -200 to +850 °C
• Basic Error Limit: ±0.1% of full scale
• Conversion Time: 100 ms per channel (50 Hz)
• Supply Voltage: 24 V DC via backplane bus
• Power Consumption: Max. 1.5 W
• Mounting: DIN rail
• Operating Temperature: 0 to 55 °C (horizontal mounting)
• Connection: Screw terminals
• Diagnostics: Wire break, short circuit, overflow/underflow

Recommendations

For optimal performance, use shielded twisted-pair cables for RTD connections and ensure proper grounding. This module is ideal for applications requiring high accuracy and reliability in temperature measurement.