Allen Bradley 1746-IG16 16-Point DC Input Module

The Allen Bradley 1746-IG16 is a high-performance 16-point DC input module for the SLC 500 platform. Featuring a 24V DC sinking configuration, it provides reliable digital signal acquisition for high-density automation systems. With optical isolation and LED status indicators, it optimizes system diagnostics and ensures robust performance in harsh manufacturing environments.

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Category Module Brand: Allen Bradley

Allen Bradley 1746-IG16: High-Density 24V DC Input

The Allen Bradley 1746-IG16 is a high-density 16-point digital input module designed for the versatile SLC 500 modular PLC system. This module is engineered to capture 24V DC discrete signals from a wide range of field devices, including proximity sensors, encoders, and manual controls. By providing 16 input channels in a single slot, the 1746-IG16 allows system designers to maximize I/O density within the ControlLogix or SLC chassis, effectively reducing the overall footprint of the control cabinet while maintaining high operational reliability.

Sinking Input Configuration and Safety

Operating on a sinking input configuration, the 1746-IG16 is optimized for use with PNP-type sensors and other sourcing field devices. Each of the 16 channels is optically isolated from the backplane logic, providing robust protection against electrical noise and high-voltage surges. This isolation, combined with the module’s 1500V AC dielectric strength rating, ensures that critical process data remains clear and the main CPU remains protected. The module also features built-in filter circuitry to eliminate signal bounce, ensuring that only valid state changes are reported to the controller.

Diagnostic Features and Industrial Standards

Maintenance and uptime are enhanced through integrated diagnostic tools. The front panel of the 1746-IG16 is equipped with 16 green status LEDs, one for each input point, providing real-time visual verification of signal activity. A ‘Module OK’ LED indicates the healthy status of the internal electronics. The module is fully hot-swappable when using compatible chassis, allowing for maintenance without interrupting the entire system. Adhering to international quality standards such as c-UL-us and CE, the 1746-IG16 is a durable and future-proof choice for expanding the digital sensing capabilities of any SLC 500-based automation architecture in sectors ranging from logistics to food processing.