1794-OW8 | Allen-Bradley | FLEX I/O 8-Channel Isolated Relay Output Module

Product Overview

The Allen-Bradley 1794-OW8 serves as a high-density relay output interface within the FLEX I/O modular platform. This module provides eight individually isolated Form A (normally open) relay contacts, allowing the PLC to control diverse AC and DC loads from a single distributed node. It bridges the gap between low-level logic and high-power field devices like motor starters, solenoid valves, and indicators. We provide this unit as 100% Brand New and Original, ensuring your control architecture utilizes factory-fresh contacts with zero mechanical wear.

Technical Specifications

Engineering Advantages

The 1794-OW8 addresses critical isolation and load-switching challenges in distributed control environments through specialized hardware design:

• Complete Channel Isolation: The module provides individual isolation for all eight relay outputs. This architecture prevents electrical noise or faults on one circuit from propagating to adjacent channels or the central FLEX I/O backplane, significantly increasing overall system availability.

• Versatile Voltage Handling: The relay contacts manage a wide spectrum from 5V DC up to 250V AC. This allows engineers to mix different voltage levels and load types (Resistive or Pilot Duty R150) on the same module, reducing the need for multiple specialized output cards.

• Low-Level Signal Switching: With a minimum contact load of 100 μA at 100 mV DC, the 1794-OW8 reliably switches very low-power signals. This capability overcomes the "contact wetting" issues often found in standard industrial relays when used with high-impedance electronic inputs.

• Rapid Diagnostic Visibility: Eight dedicated yellow status indicators provide instantaneous visual feedback for each output state. This feature simplifies field troubleshooting by allowing technicians to verify PLC command execution at a glance without utilizing a programming terminal.

• Compact DIN Rail Integration: The module snaps directly onto compatible terminal bases (1794-TB2, TB3, TBN, etc.). This modular approach minimizes enclosure wiring and permits high-density I/O packing in restricted spaces, common in remote marshalling cabinets.

FAQs

• Which terminal bases are compatible with the 1794-OW8?

  The module interfaces with several FLEX I/O bases, including the 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBN, and the fused 1794-TBNF. Select the base that best fits your field wiring and fusing requirements.

• Does the 1794-OW8 require external 24V DC power?

  Yes. The module requires an external 24V DC power source (125 mA) to energize the internal relay coils. It also draws 35 mA from the Flexbus to power the logic side of the interface.

• What is the significance of the 9-position keyswitch?

  The keyswitch ensures that the 1794-OW8 only seats into a terminal base configured for its specific electrical profile. This mechanical interlock prevents accidental insertion of the wrong module type, protecting your field wiring and hardware from voltage mismatches.

• How do I ensure the "Brand New" condition of the unit?

  We guarantee every 1794-OW8 arrives in its original Allen-Bradley factory box with intact security seals. Every unit carries a unique GTIN (10662468112298) for traceability, ensuring the hardware has never experienced previous electrical cycles.