Siemens SIMATIC S7-1200 Analog Input Module SM 1231 RTD 4 AI 6ES7231-5PD32-0XB0

The Siemens SIMATIC S7-1200 Analog Input Module SM 1231 RTD 4 AI is a high-precision expansion module designed for the S7-1200 controller system. It provides four channels for resistance temperature detector (RTD) inputs, enabling accurate temperature measurement in industrial automation applications. With support for a wide range of RTD types including Pt100, Pt200, Pt1000, Ni100, Ni200, Ni500, Ni1000, Cu10, Cu50, and Cu100, this module offers flexibility for various temperature sensing requirements. The module features 15-bit plus sign resolution, ensuring precise data acquisition, and includes diagnostic functions such as wire break and short circuit detection for enhanced reliability.

Advantages

High accuracy of ±0.1% of full scale value ensures reliable temperature measurement. The module supports 2-wire, 3-wire, and 4-wire connection methods, allowing compatibility with different RTD configurations. Electrical isolation between channels and the backplane bus provides protection against interference and improves system stability. Easy configuration via TIA Portal software simplifies setup and integration.

Suitable for

• Industrial temperature monitoring and control systems
• Process automation in manufacturing, chemical, and food industries
• HVAC and building automation
• Laboratory and test equipment requiring precise temperature measurement

Key specifications

• Module Type: Analog Input Module
• Series: SIMATIC S7-1200
• Number of Analog Inputs: 4 channels
• Input Type: Resistance Temperature Detector (RTD)
• Resolution: 15 bits + sign (16 bits)
• Accuracy: ±0.1% of full scale value
• Supported RTD Types: Pt100, Pt200, Pt1000, Ni100, Ni200, Ni500, Ni1000, Cu10, Cu50, Cu100
• Connection Method: 2-wire, 3-wire, 4-wire
• Isolation: Yes, between channels and backplane bus
• Supply Voltage: 24V DC via backplane bus
• Power Consumption: Max. 1.5 W
• Operating Temperature: -20 to +60 °C
• Storage Temperature: -40 to +70 °C
• Mounting Type: DIN rail
• Firmware Requirement: CPU firmware V4.0 or higher
• Configuration Software: TIA Portal
• Diagnostics: Wire break detection, short circuit detection
• Input Current (max.): 0.5 mA for RTD measurement

Recommendations

For optimal performance, use with Siemens S7-1200 CPUs running firmware V4.0 or higher. Ensure proper wiring according to the selected connection method (2-wire, 3-wire, or 4-wire) to maintain accuracy. The module is designed for DIN rail mounting and requires no external power supply as it is powered via the backplane bus.