Allen-Bradley 1756-1A16 ControlLogix 16 Channel Digital Input Module

The Allen-Bradley 1756-IA16 (also seen as 1756-IA16I/IA16A in revision notes) is a 16-channel ControlLogix digital input module designed to read AC field signals in a 1756 I/O backplane. Each of the 16 inputs is isolated from the others and from the backplane, helping prevent cross-talk and wiring errors in industrial environments. The module accepts 79 to 132 VAC input signals (nominally 120 VAC) and uses a 20-pin removable terminal block for field connections. As a member of the ControlLogix I/O family, it plugs into a 1756 backplane in a compatible chassis and is configured in Rockwell Automation software (Studio 5000/RSLogix) to map each channel to a PLC tag. Typical applications include reading discrete signals from sensors and switches on machines, conveyors, and packaging lines where 120 VAC logic is used, enabling straightforward expansion of a ControlLogix I/O topology without affecting neighboring channels. This 16-channel digital input module provides a scalable solution for industrial automation tasks that require reliable, isolated AC input monitoring and easy field wiring through the removable terminal block.