Product Overview

The Allen-Bradley 1746-IB16/C​ is a fundamental and widely used 16-channel, 24V DC digital input module designed for the Allen-Bradley SLC 500 modular programmable controller system. This module serves as a primary interface for connecting a variety of DC field devices—such as pushbuttons, limit switches, photoelectric sensors, and proximity switches—to the SLC 500 processor. Its core function is to read the on/off status of these devices by sensing the presence or absence of a 24V DC signal at each of its 16 input points, converting these physical states into digital data that the SLC processor can use in its control logic. The Allen-Bradley 1746-IB16/C​ is characterized as a “sinking” input module, meaning that to signal an ON (or logic 1) state, the field device must source current intothe module’s input terminal, a wiring configuration that is standard for many industrial sensors and switches.As part of the enduring 1746 I/O family, this module slots into a 4-, 7-, 10-, or 13-slot 1746 chassis, communicating with the processor over the proprietary backplane. Its design emphasizes reliability, simplicity, and cost-effectiveness for high-density discrete input applications. Each channel is electrically isolated in groups (typically in banks of 8) and includes status LEDs for visual indication of the input state, which is invaluable for troubleshooting. The Allen-Bradley 1746-IB16/C​ represents the workhorse of discrete automation for thousands of factories worldwide. It is a cornerstone component in the vast installed base of SLC 500 systems, which, despite being a legacy platform, continues to operate reliably in countless facilities. For maintenance technicians, system integrators, and plant engineers, the 1746-IB16/C​ is a critical spare part. Its failure can incapacitate multiple machine inputs, and its availability is essential for supporting the ongoing operation, repair, and minor expansions of these reliable and cost-effective control systems, ensuring continued productivity without the need for a full system overhaul.

Technical Specifications