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Allen Bradley 1769-OB8 CompactLogix DC Output Module

Configured for 24 VDC digital signal execution in CompactLogix I/O systems, the Allen Bradley 1769-OB8 (1769-OB8 DC Output Module) provides direct physical switching control for field devices through transistor-based outputs. This module contains 8 DC output channels and supports high-current output operation within Allen-Bradley CompactLogix platforms.

Hardware Specifications

Parameter	Specification
Model	1769-OB8
Brand	Allen Bradley
Origin	USA
Product Series	CompactLogix
Module Type	DC Digital Output Module
Output Channels	8 points
Output Type	Digital DC Source Output
Operating Voltage	24 VDC
Output Class	High Current Output Module
Series Compatibility	Series A and B
Weight	0.65 kg (1.44 lbs)
Wire Size	22-16 AWG stranded wire
Mounting Method	Panel Mount or DIN Rail
Replacement Terminal Block	1769-RTBN18
Replacement Door	1769-RD
Configuration Method	I/O Memory Mapping

EtherNet/IP and CompactLogix I/O Architecture

The 1769-OB8 operates as a CompactLogix expansion I/O module and communicates through the controller backplane bus. Therefore, the module exchanges output data through the configured I/O memory mapping structure.

The CompactLogix architecture supports I/O density scaling by allowing multiple local and expansion modules within the controller system. In addition, firmware compatibility and controller configuration determine the supported module integration parameters.

The module executes transistor output switching commands according to controller logic instructions. Consequently, field wiring receives discrete DC control signals through the 8 output points.

Frequently Asked Questions

Q: What output signals does the 1769-OB8 generate?
A: The 1769-OB8 provides 8 digital DC output channels with 24 VDC operating voltage for controlling external field devices.

Q: Can the terminal block and door assembly be replaced on the 1769-OB8?
A: Yes. The terminal block can be replaced with the 1769-RTBN18, and the removable door can be replaced with the 1769-RD assembly.

Q: How is the 1769-OB8 configured in a CompactLogix controller system?
A: The module uses I/O memory mapping for output data exchange between the controller and the physical output channels.

Field Installation Guidelines

Install the 1769-OB8 on a suitable DIN rail or panel mounting surface according to the CompactLogix installation requirements.

Use stranded wire within the specified 22-16 AWG range for terminal connections. Route DC output wiring separately from high-voltage power cables to reduce electrical interference.

Connect field device wiring with correct polarity because the module operates as a DC source output device. Maintain proper grounding practices for the control cabinet and ensure the shield termination follows the plant grounding standard.

Before replacing the terminal block or door assembly, remove power from the module and verify that no active field voltage remains on the wiring terminals.

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