1771-IBD Allen-Bradley PLC 5 Digital DC Input Module | Fast Delivery

Product Engineering Profile

• The 1771-IBD is a high-density discrete DC input interface designed for the PLC 5 series.
• It features Sixteen (16) 10-30VDC sink input channels, optimized for interfacing with 24V binary field devices.
• High-speed logic transition is achieved with a 1ms ON-delay, ensuring rapid response for time-critical discrete signaling.
• The module is housed in a single-slot form factor, maximizing rack density within compatible 1771 universal chassis.

Global PLC Spare HUB's Insight

• From a maintenance perspective, the 1771-IBD is a remarkably resilient module for legacy system life extension.
• The 1771-WH field wiring arm is a key ergonomic feature, allowing engineers to swap modules without the risk of wiring errors or downtime.
• Its internal opto-electrical isolation effectively decouples noisy field-side transients from the sensitive PLC backplane.
• This module is the standard choice for users migrating from lower-density 1771 DC inputs while maintaining existing voltage standards.

Comprehensive Technical Specifications

• Manufacturer: Rockwell Automation / Allen-Bradley
• Model Number: 1771-IBD
• Product Type: Digital DC Sink Input Module
• Number of Inputs: 16 Channels
• Operating Voltage: 10 to 30V DC (Sink Configuration)
• Minimum On-State Voltage: 10V DC
• Maximum Off-State Voltage: 5V DC
• Backplane Current: 130 mA @ 5V DC
• Power Dissipation: 7.3 Watts (Maximum)
• Thermal Dissipation: 24.7 BTU/hr (Maximum)
• Chassis Compatibility: All 1771 racks (Excludes A1, A2, A4)

Diagnostic Capabilities & Indicators

• Visual Diagnostics: 18 Integrated LED indicators (1 Green Module Status, 16 Red Channel Status).
• Front Panel Feedback: Real-time confirmation of signal presence at the field termination points.
• Error Filtering: On-board digital filtering reduces electrical bounce and noise-induced false triggers.
• Hardware Keying: Slot-specific keying bands (Pins 10-12 and 16-18) prevent accidental insertion of incorrect modules.

Device Compatibility & Application Scenarios

• Compatible Devices: Dry-contact switches, proximity sensors, pushbuttons, and electro-mechanical limit switches.
• Machine Control: Monitoring auxiliary contacts on motor starters and safety relays within 24V control circuits.
• Panel Logic: Interfacing selector switches and operator console inputs to the PLC 5 processor.
• Automated Sorting: Processing high-frequency signals from photo-eyes in conveyor indexing systems.

Logistics & Warranty Terms

• Shipping Methods: Global express delivery via FedEx, UPS, and DHL.
• Dispatch Time: Reliable shipment within 24-48 hours of order verification.
• Warranty Policy: Protected by a full 12-month replacement warranty.
• Installation Requirements: Requires a Cat. No. 1771-WH or 1771-WN Field Wiring Arm for termination.

Professional FAQ & Purchasing Guide

• What is the difference between Sink and Source inputs for the 1771-IBD?
• The 1771-IBD is a "Sink" module, meaning it provides a path to ground and requires "Source" (PNP) field devices to switch the positive voltage.


• Why is this module incompatible with 1771-A1, -A2, and -A4 chassis?
• Those legacy chassis have power and physical constraints that do not support the higher density and current draw requirements of the 1771-IBD.


• Can I adjust the input delay time for faster switching?
• The OFF-to-ON delay is fixed at 1ms; however, the ON-to-OFF delay can be either 1ms or 6ms depending on the specific module series and configuration.


• Selection Guide: When should I choose the 1771-IBD over the 1771-IB?
• Select the 1771-IBD when you need 16 channels in a single slot. The standard 1771-IB typically provides only 8 channels, making the IBD more cost-effective for high I/O counts.


• Experience Tip: What should I check if a red LED is on but the PLC doesn't see the signal?
• The red LED indicates voltage is present at the field terminal. Check your block transfer instructions (BTR/BTW) in the PLC logic; if the LEDs are active but the data table is not updating, the issue is likely communication/addressing, not hardware.

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