1771-OBD | Allen-Bradley | 16-Channel DC Discrete Output Module

Product Description

The 1771-OBD output module from Allen-Bradley is part of the PLC-5 and 1771 Series I/O family. This discrete DC output module provides 16 channels, designed to deliver reliable switching performance for industrial automation systems. With a nominal output voltage of 48 VDC and a wide operating range of 10–60 VDC, the 1771-OBD ensures robust operation across diverse applications. It supports resistive and pilot duty loads, surge current handling, and conforms to Allen-Bradley’s modular rack-mountable design for easy integration.

Technical Specifications

• Manufacturer: Allen-Bradley

• Part Number: 1771-OBD

• Product Line: PLC-5 / 1771 Series I/O

• Category: PLCs

• GTIN: 10612598128485

• Module Type: Discrete DC Output Module

• Number of Outputs: 16 channels

• Operating Voltage Range: 10–60 VDC

• Nominal Output Voltage: 48 VDC

• Output Current Rating:

• 2 A per channel (resistive load)

• 0.2 A per channel (pilot duty)

• Maximum 8 A per module continuous

• Surge Current Capacity:

• 4 A per output for 10 ms (repeatable every 2 s)

• 25 A per output for 10 ms (repeatable every 2 s)

• Minimum Load Current: 2.5 mA

• Power Dissipation: 15.6 W

• Thermal Dissipation: 53.3 BTU/hr

• Backplane Current Draw: 400 mA

• Compatible Chassis: 1771 I/O chassis

• Keying Positions: Between 10–12 and 22–24

• Field Wiring Arms: 1771-WH, 1771-WHF, 1771-WHFB

• Wiring Arm Screw Torque: 7–9 in-lbs

• Coating: Conformal coat for durability

• Data Format: BDC or natural binary

• Signal Delay:

• AC Off Delay: 45 ± 15 ms

• DC Off Delay: 50 ms

• Mounting: Rack-mountable

• Weight: 1.63 lbs (0.74 kg)

Key Features

• 16 DC Outputs: Supports a wide voltage range for flexible applications

• High Current Capacity: Up to 2 A per channel, 8 A per module continuous

• Surge Protection: Handles transient currents up to 25 A per channel

• Reliable Integration: Designed for PLC-5 and 1771 Series chassis

• Durable Construction: Conformal coating for enhanced environmental resistance

Application Scenarios

• Industrial machinery control requiring multiple DC outputs

• Power distribution and switching systems

• Manufacturing automation with PLC-5 controllers

• Process industries needing robust discrete output modules

FAQ

Q: How many outputs does the 1771-OBD provide?  A: It supports 16 discrete DC output channels.

Q: What is the nominal operating voltage?  A: The module operates at a nominal 48 VDC, with a range of 10–60 VDC.

Q: Which wiring arms are compatible with this module?  A: 1771-WH, 1771-WHF, and 1771-WHFB wiring arms are supported.

Comparison with Similar Models

• 1771-OBD: 16-channel DC output, 10–60 VDC range

• 1771-OBN: Similar design but optimized for AC outputs

• 1771-OBD/B: Updated version with enhanced performance