Allen Bradley 1734-OB8E Digital Output Module

Module Overview

The Allen Bradley 1734-OB8E is an 8-channel EtherNet/IP-enabled digital output module within the POINT I/O series, designed for distributed control systems requiring compact and flexible I/O configurations. This module provides high-speed sourcing outputs for controlling actuators, solenoids, and relays while allowing engineers to monitor output status through diagnostic feedback.

Compact, modular, and DIN-rail mounted, the 1734-OB8E integrates seamlessly into Allen Bradley’s Logix control platform, making it ideal for decentralized and space-constrained automation systems.

Technical Specifications

Typical Industrial Applications

The 1734-OB8E is widely adopted in control architectures that require distributed I/O, high-speed output control, and Ethernet connectivity. Common use cases include:

• Automated Assembly Lines – precise actuation of pneumatic valves or cylinders.

• Material Handling Systems – control of conveyors, diverters, and gates.

• Packaging Machinery – output triggering for labelers, sensors, and feeders.

• Process Equipment – digital control of solenoid valves and pumps.

• Building Automation – managing relays and output-driven lighting or ventilation systems.

The compact POINT I/O format makes it ideal for machine builders and OEMs who demand flexibility and simplified wiring for distributed installations.

Performance Highlights

• EtherNet/IP Connectivity: Enables direct integration into ControlLogix and CompactLogix systems for real-time data exchange.

• High-Speed Outputs: Fast response suitable for motion synchronization and event-driven control.

• Diagnostics and Feedback: Built-in LED status and fault detection enhance system reliability.

• Space Optimization: Ultra-compact design reduces panel footprint without compromising performance.

• Flexible Installation: DIN-rail modular design allows easy expansion and maintenance.

• Energy Efficient: Low power consumption and minimal heat dissipation improve system efficiency.

Technical Q&A — Engineer’s Perspective

1. What is the output type for the 1734-OB8E?
   It uses sourcing (PNP) outputs, delivering 24V DC to field devices.

2. How are faults detected?
   The module includes electronic diagnostics for open-circuit and short-circuit conditions.

3. Can it be used in hazardous areas?
   Yes, it is certified for Class I, Division 2 applications.

4. How does it connect to the controller?
   It connects via POINTBus through an EtherNet/IP adapter such as 1734-AENT or 1734-AENTR.

5. What is the typical response time?
   Approximately 0.1 milliseconds per channel.

6. Can channels be individually configured?
   Yes, each output can be controlled independently through the PLC program.

7. Does it require external power?
   Yes, it draws 24V DC from a connected POINT I/O power terminal.

8. Is hot-swapping supported?
   Yes, modules can be replaced while powered if the POINTBus is energized.

9. What happens in case of a field short circuit?
   The module automatically disables the affected channel and reports a diagnostic fault to the controller.

10. Which controllers are compatible?
    Compatible with CompactLogix, ControlLogix, and other EtherNet/IP-based systems.

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