Overview
The Allen-Bradley 1771-NT2 is a high-resolution thermocouple input module for the PLC-5 and PLC-3 family, providing precise temperature measurement in industrial control systems.
Input Capabilities
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Model: 1771-NT2
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Manufacturer: Allen-Bradley
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Input type: Thermocouple
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Channels: 8 mV/TC inputs
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Input range: -5.5 to 56.0 mV (selectable by thermocouple type: B, C, E, J, K, N, R, S, T)
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Resolution: 0.9 µV/bit at 16 bits unipolar (0.03 °C for E, J, K, T, N; 0.1 °C for B, R, S)
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Input resistance: >10 MΩ
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Thermocouple linearization: IPTS-68 / NBS MN-125 standards
Performance Characteristics
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Open-circuit detection: Max 5 seconds
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Offset drift: ±0.50 µV/°C
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Gain drift: ±35 ppm/°C
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Under/overrange threshold: -5.5 mV / ±56 mV
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Rate alarm value: Min 24 µV / 0.9 °C/s, Max 30 mV / 1050 °C/s (50% full-scale)
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Module update time: 25 ms
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Common mode rejection: 150 dB at 60 Hz
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Input bandwidth: 9 Hz
Power and Backplane
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Backplane current load: 1 A
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Power dissipation: 5 W at 5 V
Physical Characteristics
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Module size: Single slot in 1771 I/O chassis
