Allen-Bradley | 1771-IBD PLC-5 Digital DC Input Module | 10-30V DC 16-Channel

Functional Capabilities

The 1771-IBD (Part Number: 1771-IBD) is a high-density discrete input module designed for the Allen-Bradley 1771 Universal I/O platform. It features 16 individual points capable of interfacing with a variety of DC sourcing field devices, such as limit switches, photoelectric sensors, and proximity triggers. The module provides robust signal conditioning and opto-electrical isolation to protect the PLC-5 backplane from industrial electrical noise and transient voltage spikes.

Detailed Technical Specifications

The 1771-IBD provides reliable digital sensing with the following electrical characteristics:

• Input Channels: 16 Points per module

• Voltage Operating Range: 10V DC to 30V DC (Sinking/Sourcing dependent on wiring)

• On-State Voltage (Minimum): 10V DC

• Off-State Current (Maximum): 2.0 mA @ 5V DC

• Input Current Draw: 4.5 mA @ 10V DC up to 15 mA @ 30V DC

• Input Impedance: 2.2K Ohms maximum

• Signal Propagation Delay: 1ms (Low to High); Selectable 1ms or 6ms (High to Low) via internal jumpers

• Backplane Current Requirement: 130 mA @ 5V DC (±5%)

• Power Dissipation: 1.0 Watt minimum to 7.3 Watts maximum

• Thermal Output: 3.4 BTU/hr (idle) to 24.7 BTU/hr (peak load)

• Isolation Rating: Verified to UL 508 and CSA C22.2 No. 142 industrial standards

Physical and Installation Parameters

Proper installation ensures long-term reliability in harsh manufacturing environments.

• Wiring Configuration: Requires a 1771-WH or 1771-WG Wiring Arm

• Terminal Torque: 7 to 9 inch-pounds

• Conductor Specification: 14 AWG (2mm²) stranded maximum with 3/64 inch insulation

• Chassis Slot Keying: Positioned between 10 and 12, and between 16 and 18

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Storage Temperature: -40°C to 85°C (-40°F to 185°F)

• Humidity Limits: 5% to 95% (Non-condensing)

Implementation and Integration FAQ

How is the input filter delay adjusted?The 1771-IBD features a selectable High-to-Low transition delay. By default, it is often set to 6ms to filter out contact bounce from mechanical switches, but it can be shortened to 1ms for high-speed electronic sensing applications via internal module jumpers.

Can this module be used in a Remote I/O (RIO) rack?Yes, it is fully compatible with any 1771 Universal I/O chassis, whether it is controlled locally by a PLC-5 processor or remotely via a 1771-ASB or 1771-AENTR adapter.

What is the significance of the "Category 1" rating?This refers to the Rockwell Automation wiring category, indicating that the signal lines should be routed appropriately to avoid electromagnetic interference from high-power motor leads or AC cables.