Allen-Bradley 1756-IB16I 16 Point Digital Input Module

The Allen-Bradley 1756-IB16I 16-point digital input module for ControlLogix systems monitors discrete 24 V DC field signals with individually isolated inputs and is designed to drop into a ControlLogix chassis slot for reliable I/O expansion. It supports sinking or sourcing 24 V DC input operation, enabling flexible wiring to pushbuttons, limit switches, proximity sensors, and auxiliary contacts. Widely used in industrial automation to receive signals from field devices, the 1756-IB16I supports high-density input monitoring in manufacturing plants, oil and gas facilities, water treatment systems, packaging operations, and automated production lines where accurate and isolated input detection is essential. Typical applications include I/O expansion, module replacement, system upgrades, and integration of field input devices into PLC-based control systems, with backplane current draw described as application dependent. Common replacements include Allen-Bradley 1756-IB16 and 1756-IB16IF, with Siemens 6ES7521-1BL00-0AB0 listed as a cross-reference in some control architectures.