Allen-Bradley 1771-IGD 16-Point Digital Input Module

Allen-Bradley 1771-IGD is a 16-point TTL digital input module designed for the PLC-5 family and 1771 I/O backplanes. It provides 16 5-volt DC digital inputs with TTL-level signaling, using TTL current-sourcing inputs to reliably detect state from discrete sensors and switches. The module is part of the Series A 1771 I/O lineup and is commonly paired with a 1771-WH wiring arm to simplify field wiring. Operated from a 5.0–5.3 VDC supply, the 1771-IGD draws about 130 mA from the backplane, enabling it to sit alongside other 1771 modules in a PLC-5 chassis. This 16-point input card delivers straightforward, high-density input interfacing for PLC-5 control logic, enabling quick reading of multiple digital signals from industrial sensors, switch boxes, or other discrete devices.