1771-IBD Ser B (PU)

Allen Bradley Bulletin 1771 | DC Input Module

PAllen Bradley Bulletin 1771 | 16-Point 24VDC Sinking Input Module, Voltage Range 10-30VDC, Series B

The Allen-Bradley 1771-IBD is a high-density discrete DC input module designed for the 1771 Universal I/O platform. It serves as a reliable interface between the PLC-5 controller and 24VDC field devices, providing 16 sinking input channels within a single slot. It is engineered for industrial applications requiring fast response times and high-integrity signal processing for discrete sensors and switches.

This Series B module operates within a voltage range of 10–30VDC (24VDC nominal) and features 16 discrete points organized into a single group. To simplify maintenance and installation, it utilizes the 1771-WH field wiring arm, which allows for module replacement without disturbing existing field wiring. The module includes robust optical isolation to protect the sensitive backplane logic from potential electrical noise or voltage transients on the field side.

Performance-wise, the 1771-IBD is optimized for speed, offering a typical signal delay of 1.0ms for both ON and OFF transitions. This makes it an ideal choice for high-speed machine control and time-critical automation tasks. The module features front-panel status LEDs for each of the 16 channels, providing immediate visual diagnostics for power presence and signal state during operation.

Built for the rigors of the factory floor, the 1771-IBD operates reliably between 0–60°C (32–140°F) in 5–95% non-condensing humidity. It draws 150mA at 5VDC from the chassis backplane. The assembly is designed to withstand significant operational shock and vibration and is UL listed, CSA certified, and CE compliant, ensuring it meets global standards for industrial safety and performance.

Key Specifications:

 - Inputs: 16 (Sinking)
 - Nominal Voltage: 24VDC (Range: 10–30VDC)
 - Backplane Current: 150mA @ 5VDC
 - Signal Delay: 1ms (typical)
 - Wiring Arm: 1771-WH
 - Platform: 1771 Universal I/O (PLC-5)
 - Series: B