The Allen-Bradley 1771-IT is an 8-point digital input module for the SLC 500 PLC family, providing eight discrete input channels that feed the controller via the backplane. It installs in an SLC 500 chassis and maps each input to a corresponding I/O address in the processor's data files. Typical uses include reading sensors and switches such as limit switches and pushbuttons on industrial lines. As part of the 1771 I/O family, it is designed to work with other 1771 modules in the same rack to expand the controller's input capabilities.
