1771-OB | Allen-Bradley PLC-5 Digital DC Output Module | 12-24V DC 8-Point

Product Overview

The 1771-OB is a DC output driver module engineered for the Allen-Bradley PLC-5 control system. It provides eight individually isolated sourcing outputs designed to control DC loads with high reliability. Operating within a 12–24 VDC range, this module is ideal for industrial automation applications requiring dependable output performance. Its compact design ensures seamless integration into 1771 I/O chassis and full compatibility with PLC-5 processors.

Key Features

• Brand: Allen-Bradley

• Model: 1771-OB

• Product Type: DC Output Module

• Series: PLC-5

• Number of Outputs: 8 sourcing outputs

• Output Voltage Range: 12–24 V DC

• Maximum Load Current: 2 A per output (typical)

• Power Consumption: 192 VA

• Isolation: Channel-to-channel and channel-to-backplane isolation

• Status Indicators: LED per channel for output status monitoring

• Mounting: 1771 I/O chassis slot

• Weight: Approx. 0.44 kg

• Operating Temperature: 0°C to 60°C

• Discontinuation Date: June 30, 2010

Application Scenarios

The 1771-OB module is suitable for various industrial control systems, including:

• Manufacturing lines: For DC output signal control in automated production systems

• Process automation: Compatible with PLC-5 architecture for distributed control

• Machine control panels: Ideal for discrete DC load interfacing

• Legacy system upgrades: Reliable for replacing or maintaining older PLC-5 configurations

Compatibility

• System Integration: Compatible with Allen-Bradley PLC-5 controllers and 1771 I/O chassis

• Communication Support: Functions with standard 1771 I/O adapters and mixed-module configurations

• Replacement Options: Interchangeable with other DC sourcing modules within the same voltage and current range

FAQs

Q: Can the 1771-OB control AC loads?
A: No, it is designed exclusively for DC load control. For AC applications, use the 1771-OA series.

Q: Is the 1771-OB still in production?
A: No, Allen-Bradley discontinued this model on June 30, 2010. It is now available as refurbished or surplus.

Q: What type of outputs does it provide?
A: The module provides sourcing (positive) DC outputs for controlling external loads.

Q: Which PLC family does it support?
A: It is specifically designed for the Allen-Bradley PLC-5 system.