The Allen-Bradley 1746-NT8 is an SLC 500 thermocouple/mV analog input module.

The module has eight (8) channels and is compatible with thermocouple sensors such as J, K, T, E, S, R, B, and N. It is also compatible with mV inputs such as +/- 50 mV and +/- 100 mV.

It is also compatible with mV inputs such as +/- 50 mV and +/- 100 mV. The module is compatible with both stationary and modular SLC 500s.

About the 1746-NT8

The 1746-NT8 is Allen-Bradley’s SLC 500 thermocouple/voltage analog input module.

It is a chassis-mounted, eight (8) channel module that receives thermocouple/voltage signals and converts them to digital signals for retrieval by any SLC 500 processor.

It has a backplane current rating of 120mA at 5V DC and 70mA at 24V DC for a total backplane power of 2.28W.

The 1746-NT8 uses a delta-sigma signal conversion method and has a digital low-pass filter with selectable programmable filter frequencies.

The normal mode rejection between terminals is greater than 100 dB at 50-60 Hz, and the common mode rejection between input and ground is greater than 100 dB at 50-60 Hz.

The 1746-NT8 module automatically calibrates itself approximately every 2 minutes after power-up.

It provides +/-30V DC and 600W pulses for 1ms input overvoltage protection and 12.5V DC circuit isolation between inputs and chassis ground, and between inputs and backplane, with a test voltage of 500V DC for 1 minute.

The 1746-NT8 has nine green LEDs to indicate channel status and module status.

It uses the 1746-RT34 (RTB) removable terminal block to connect the input devices. The terminal block includes two (2) cold junction compensation (CJC) sensors with an accuracy of +/-1.72 degrees Celsius.