Allen-Bradley SLC 500 1746-NT4 input module

The Allen‑Bradley 1746‑NT4 is a four‑channel SLC 500 Thermocouple/mV analog input module that accepts J, K, T, E, S, R, B, N thermocouples or ±50/±100 mV sensors. Common failure modes include loose or corroded connector pins, sensor degradation (especially with high‑temperature or corrosive environments), overvoltage on the mV input causing channel saturation, and internal analog front‑end drift leading to offset errors. First‑check diagnostics: verify 24 VAC/120 VDC power to the chassis, inspect all cable connectors for continuity and proper seating, confirm that sensor signals fall within specified ranges (±50 mV or ±100 mV), and review any PLC error codes related to input channel faults.[oss-gpt-20b]

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