Description

Brief Product Description

The Allen-Bradley 1756-IB16 is a high-performance ControlLogix digital input module featuring 16 sinking DC channels. It provides reliable signal acquisition with a flexible 10–31.2V DC operating range and customizable input filtering for demanding industrial automation tasks.

​Product Description

Optimized Discrete Signal Acquisition

The Allen-Bradley 1756-IB16 serves as a core component within the ControlLogix platform, providing sixteen discrete input channels for monitoring field-side sensors and switches. This module organizes its inputs into two isolated groups of eight, which allows for versatile wiring configurations across different power sources if necessary. Because the unit supports a broad operational voltage range from 10V to 31.2V DC, it maintains high signal integrity even during industrial power fluctuations. Engineers typically deploy this module to interface with limit switches, photoelectric sensors, and push buttons, ensuring accurate data reaches the controller backplane with minimal latency.

Advanced Signal Processing and Noise Immunity

Reliability in electrically noisy environments is a primary strength of the 1756-IB16 architecture. The module features user-definable hardware and software filters, with input delay times adjustable from 0ms to 18ms. These settings allow developers to suppress mechanical contact bounce and electromagnetic interference effectively. Furthermore, the module supports “Change of State” (COS) detection. By utilizing COS, the module can trigger an immediate processor interrupt upon a signal transition, bypassing the standard RPI (Requested Packet Interval) cycle. This feature significantly enhances response times for high-speed manufacturing lines and safety-critical monitoring.

Robust Industrial Integration

Designed for the 1756 chassis, the Allen-Bradley 1756-IB16 integrates seamlessly with ControlLogix 5570 and 5580 controllers. The hardware provides 250V continuous isolation, protecting sensitive backplane electronics from field-side surges and ground loops. Installation remains flexible through the use of Removable Terminal Blocks (RTBs), available in both spring-clamp and screw-terminal versions. Whether implemented in a centralized PLC rack or a distributed I/O station via EtherNet/IP, the module delivers consistent performance across a variety of sectors, including automotive assembly, water treatment, and large-scale process automation.

Technical Specification Table