1746-NT4 Allen Bradley SLC 500 Thermocouple / Analog Input Module

Allen-Bradley 1746-NT4 is a SLC 500 Thermocouple/mV Analog Input Module

1746-NT4

1746-NT4 module has 4 backplane isolated input channels. It has a backplane current consumption of 60 mA at 5 Volts DC and 40 mA at 24 Volts DC. It has a backplane power consumption of 0.3 Watts at 5 Volts DC and 0.5 Watts at 2 Volts DC, a 16-bit converter resolution, and a 12 to 300 millisecond Step response at 95%. It has a bandwidth of 2.62 - 65.5 Hertz and a 26 millisecond - 1.2 second update period and uses sigma-delta modulation for A/D conversion. It can be installed in any slot except slot 0 of the SLC 500 chassis. It uses two wires per terminal with a maximum wire size of 2.5 millimeters (14 AWG) and 25 ohms maximum cable impedance. For Thermocouple inputs, use shielded twisted thermocouple extension wire; for mV inputs, Belden 8761 or equivalent wire must be used.
The 1746-NT4 is an Allen-Bradley module used with Thermocouple sensors and mV signals. This module belongs to analog input module category which belongs to the SLC 500 product family.
It features Eight (8) Thermocouple inputs with each channel supporting a wide variety of Thermocouple types such as J, K, T, E, S, R, B and N. Compatible mV signals include +/- 50 mV and +/- 100 mV. Each input channel is built with broken sensor detection may indicate a shorted or open circuit. There are configurable settings when an open circuit is detected such as Zero, Upscale and Downscale. When Zero is configured, the module’s reading is forced to Zero (0). When set to Downscale, the module’s reading is forced to the lowest reading while Upscale forces the reading to the maximum reading. These settings are helpful as it may be used to quickly diagnose the state of each channel aside from the visible LED indicators for each channel. The fault reaction settings must be based on the fail-safe operation of the process.






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