1734-OW2 | Allen Bradley | POINT I/O Relay Output Module

The Allen Bradley 1734-OW2, also cataloged as the 1734-OW2 Relay Output Module, operates as a dedicated hardware component for discrete load switching within Point I/O communication networks. This module utilizes electromechanical relay outputs to provide physical electrical isolation between the control system logic and field-side actuators, supporting diverse voltage potentials while maintaining deterministic control integration via the local backplane bus.

Hardware Specifications

PLC Deterministic Network Integration

The 1734-OW2 module integrates into the POINT I/O backplane architecture, facilitating high-speed deterministic data exchange between the host controller and field devices. The module manages switching commands through the backplane bus communication velocity, ensuring timing alignment with the I/O scan cycle. Compatibility with the POINT I/O platform allows for scalable I/O density on a single network node. Users must ensure that the firmware flash compatibility matches the specific adapter module version to maintain consistent I/O module health and diagnostic reporting within the integrated development environment.

Frequently Asked Questions (FAQ)

Q: What is the maximum switching frequency for this relay module at rated load?

A: The module is designed for a maximum switching frequency of 0.3 Hz, which equates to one operation every 3 seconds under rated load conditions. Exceeding this frequency may result in premature contact degradation.

Q: Does this module support hot-swapping during operation?

A: Yes, the POINT I/O system supports the removal and insertion of modules under power (RIUP), provided the terminal base is correctly installed and the field wiring is secured.

Field Installation Guidelines

• Environmental Constraints: Ensure the module is installed within an industrial enclosure rated for the local environment. While the module functions at -20 to 55 deg C, ensure adequate airflow to prevent heat accumulation within the DIN-rail mounting configuration.
• Wiring Standards: Use 22 to 14 AWG solid or stranded copper wire for all field connections. Ensure all terminal base screws are tightened to the torque specifications provided in the POINT I/O installation manual to prevent high-resistance connections.
• Isolation and Shielding: Given the 250 V isolation rating, ensure that field-side power circuits are segregated from low-voltage logic signal wiring. Use proper cable routing to minimize electromagnetic interference (EMI) originating from inductive loads switched by the relays.
• Relay Protection: When switching inductive loads, utilize external suppression devices (such as MOV or RC snubbers) to prevent arcing across relay contacts, as excessive inductive kickback will significantly reduce the expected contact life of 100,000 operations.