1771-IR/D

Overview

The 1771-IR/D from Allen-Bradley is an RTD input module designed for precise temperature measurement in 1771 I/O chassis systems.

Input Channels

• Number of Inputs: 6 RTD input channels

• Module Location: 1771 I/O Chassis

• Sensor Type: 100 Ω platinum (α=0.00385) or 10 Ω copper (α=0.00386); other types supported with reporting in ohms only

• Units of Measure: °C, °F, RTD resistance in ohms (10 milliohms or 30 milliohms resolution)

Measurement Range

• Temperature Range:

• Platinum: -200 to +870°C (-328 to 1598°F)

• Copper: -200 to +260°C (-328 to 500°F)

• Resistance Range: 1.00 to 600.00 Ω

• Resolution: Platinum: 0.1°C (0.1°F); Copper: 0.3°C (0.5°F)

Sensor Excitation and Protection

• Sensor Excitation: 1 mA constant current source supplied by module

• Common Mode Rejection: 120 dB @ 60 Hz up to 1000V peak

• Common Mode Impedance: >10 MΩ

• Normal Mode Rejection: 60 dB @ 60 Hz

• Input Overvoltage Protection: 120V RMS continuous

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