Here are some key details about the 1746-NI4 module:

Analog Inputs: The module provides four analog input channels, which can be used to connect various types of sensors or transducers that generate voltage or current signals. It supports both voltage and current input ranges, and the input range can be configured according to the specific requirements of your application.

Resolution: The module has a resolution of 16 bits, which means it can divide the input range into 65,536 discrete steps. This resolution allows for precise measurement and control applications.

Communication: The 1746-NI4 module communicates with the ControlLogix PLC over the backplane of the rack. It uses the Data Highway Plus (DH+) communication protocol to exchange data with the PLC processor.

Wiring: The module requires wiring the analog input signals to the corresponding terminal points on the module. The module typically has removable terminal blocks to facilitate easy wiring and maintenance.

Configuration: The 1746-NI4 module needs to be configured using software tools provided by Allen-Bradley. The configuration allows you to specify the input range, scaling factors, and other parameters relevant to the specific application.