Allen-Bradley 1746-NT4 Thermocouple/mV Input Module

Allen-Bradley 1746-NT4 Thermocouple/mV Input Module

Description

The thermocouple/mV input module receives and stores digitally converted thermocouple and/or millivolt (mV) analog data into its image table for retrieval by all fixed and modular SLC 500 processors. The module supports connections from any combination of up to four thermocouple or mV analog sensors. See the input specifications beginning on page 21 for thermocouple types, their associated temperature ranges, and the analog input signal ranges that each 1747-NT4 channel will support. Each input channel is individually configurable via software for a specific input device and provides open-circuit, over-range, and under-range detection and indication.

The module contains a removable terminal block with two cold-junction compensation (CJC) sensors. There are no output channels on the module. Configuration is done via the user program. There are no DIP switches.

Features

The thermocouple module fits into any single-slot, except the processor slot (0), in either an SLC 500 modular system or an SLC 500 fixed system expansion chassis (1746-A2). It is a Class 1 module (uses 8 input words and 8 output words). It interfaces to thermocouple types J, K, T, E, R, S, B, and N, and supports direct ±50 mV and ±100 mV analog input signals.

The module requires the use of Block Transfer in a remote configuration.

The module contains a removable terminal block providing connection for four thermocouple and/or analog input devices. There are also two, cold-junction compensation (CJC) sensors used to compensate for offset voltages introduced into the input signal as a result of the cold-junction, i.e., where the thermocouple wires connect to the module wiring terminal. There are no output channels on the module. Module configuration is done via the user program. There are no DIP switches.

Technical Specifications