Product Overview

The Allen Bradley 1734-OB2E POINT I/O 2-Point Digital Output Module is a compact digital output module used to switch discrete field devices from a POINT I/O control system.

In a machine-control application, the PLC may need to command devices such as solenoid valves, indicator circuits, contactor interfaces, or other discrete loads. The controller sends the required output state through the POINT I/O architecture, while the 1734-OB2E handles the corresponding digital output channels.

With its two-point configuration, this module is suited to smaller distributed I/O stations where only a limited number of discrete outputs are required. It can be particularly useful when individual machine sections need localized output control without installing a larger I/O block than the application requires.

The module is normally installed as part of a complete POINT I/O assembly, including the network adaptor, terminal base, controller, and field wiring.

Technical Specifications

Product Features

The 1734-OB2E provides two digital output points within the POINT I/O platform.

Key characteristics include:

• Allen Bradley POINT I/O architecture
• Two-point digital output configuration
• Suitable for discrete field-device control
• Compact module format
• Intended for distributed I/O installations
• Can be used with localized machine-control stations
• Suitable for automated equipment
• Integrates with the POINT I/O system architecture
• Dimensions of 75.5 × 12 × 56 mm
• Stated weight of 0.033 kg

The connected field devices should be checked for compatibility with the module’s actual electrical output requirements before installation.

Working Principle

A typical output path can be represented as:

PLC / Controller → POINT I/O Network → I/O Adaptor → 1734-OB2E → Field Device

The controller determines whether a particular output should be active or inactive. That command is transferred to the POINT I/O station, where the 1734-OB2E switches the corresponding digital output channel.

For example, an automated machine may need to energize a solenoid valve when a particular sequence step is reached. The controller issues the output command, and the module switches the associated field circuit.

The module therefore acts at the boundary between the control system and discrete field equipment. When an output does not behave as expected, both the electronic command path and the field-side circuit need to be considered.

Industrial Applications

The 1734-OB2E is suitable for applications where a small number of discrete output signals need to be controlled through a POINT I/O station.

The final application depends on the connected field devices and the electrical requirements of the output circuit.

Compatible System Components

The 1734-OB2E is normally combined with several components within a POINT I/O installation.

The terminal base, output module, field wiring, and connected load should be treated as one electrical path when diagnosing output problems.

Installation and Maintenance

The 1734-OB2E should be installed within a compatible POINT I/O assembly with the appropriate terminal base and network architecture.

Because digital outputs directly interface with external devices, wiring and load compatibility should be checked before energizing the circuit.

Recommended checks include:

• Confirm the complete 1734-OB2E part number.
• Verify the two-point output configuration.
• Confirm the compatible POINT I/O terminal base.
• Check the connected field-device requirements.
• Inspect output wiring.
• Verify terminal connections.
• Check for loose or damaged conductors.
• Inspect connectors for contamination or damage.
• Verify the I/O network connection.
• Check station power.
• Review the controller output configuration.
• Test each output channel individually after installation.
• Inspect connected loads if an output repeatedly faults or fails to operate.

If one output does not switch while the rest of the I/O station communicates normally, check the controller command, module channel, terminal connection, field wiring, and connected load before replacing the complete I/O station.

Recommended Related Models

For the 1734-OB2E, related components should be selected according to the required number of output points, field-device type, network architecture, and available POINT I/O space.

When selecting a replacement or alternative, verify the number of output points, electrical load requirements, terminal-base compatibility, network configuration, and controller setup.

Key Advantages

• Two-point digital output configuration
• Allen Bradley POINT I/O platform
• Compact I/O module format
• Suitable for distributed machine control
• Interfaces with discrete field devices
• Useful for localized output control
• Suitable for industrial automation systems
• Dimensions of 75.5 × 12 × 56 mm
• Stated weight of 0.033 kg

Technical FAQs

What type of field devices can the 1734-OB2E control?

The module is intended for discrete output applications. The exact connected device should be checked against the module’s electrical output requirements, particularly when driving solenoids, relays, or other inductive loads.

Why might the PLC show an active output while the field device does not operate?

The problem can occur anywhere between the controller and the final device. The output channel, terminal base, wiring, field power, connected load, and module status should be checked in sequence.

What should be considered when replacing a 1734-OB2E?

Verify the exact module number, two-point configuration, compatible terminal base, output-circuit requirements, controller configuration, and connected field devices. Physical dimensions alone are not enough to establish compatibility.

What is the advantage of using a two-point digital output module?

A two-point module is useful when a machine section requires only a small number of discrete outputs. It allows the I/O station to be expanded for specific control functions without allocating a larger output module than the application requires.