1794-OW8XT Allen-Bradley Flex I/O Relay Output Module

Product Overview

1794-OW8XT is a Flex I/O relay output module from Allen-Bradley (Rockwell Automation). It provides 8 isolated Form A (normally open) electromechanical relay channels. The module operates on a 19.2…31.2V DC supply and draws 125 mA. It mounts on 1794 terminal base units (TB2, TB3, TB3S, TBN, TBNF). A conformal coating protects against harsh environments and high temperatures. This module delivers reliable switching for demanding industrial applications.

Technical Specifications

Installation & Grounding

• Mounts on 1794-TB2, TB3, TB3S, TBN, or TBNF terminal bases.
• Use a zinc-plated yellow-chromate steel DIN rail for proper grounding.
• Ground the module through the DIN rail to ensure safety and performance.
• Terminal screw torque is determined by the installed base unit.
• For TBNF base, install 3.0 A / 250V AC slow-blow fuses (Littelfuse 239003) per channel.
• Recommended: add fusing to each output channel for protection.

Environmental & Compliance

• Conformal coated – withstands high temperatures and humidity.
• Open-style enclosure (no IP rating); suitable for industrial control cabinets.
• Isolation voltage: 250V continuous (basic insulation).
• Tested to 1500V AC, 3250V DC, and 720V DC per standard.
• Operating temperature: 0…55 °C (32…131 °F) typical for Flex I/O.
• Storage temperature: -40…85 °C (-40…185 °F).
• Meets UL, CSA, CE standards (Rockwell certifications).

Diagnostics & Maintenance

• 8 yellow status LEDs indicate each channel’s ON/OFF state.
• Diagnostic feedback via backplane communication (Flex I/O adapter).
• No calibration required – relay contacts are field-replaceable only via module swap.
• Use 3.0 A slow-blow fuses to protect outputs and simplify troubleshooting.
• Expected contact life: 100k operations min at rated load – plan maintenance accordingly.

Compatibility & Integration

• Works with any 1794-series Flex I/O adapter (e.g., 1794-ACN, 1794-ASB, 1794-AENT).
• Supports Rockwell Logix, PLC-5, SLC and other systems via Flex backplane.
• Compatible with Modicon Quantum systems using appropriate adapter (Modicon Quantum series).
• Keyswitch position 9 ensures correct base unit mapping.

Typical Applications

• Discrete output control for motors, solenoids, valves, and alarms.
• Switching AC/DC loads in packaging, material handling, and conveyor systems.
• Pilot duty rating R150 – suitable for small contactors and relays.
• Use in high-temperature areas (e.g., foundries, kilns) thanks to conformal coating.

FAQ – Quick Answers

• Q: What is the minimum contact load? 100 µA @ 100 mV DC.
• Q: Can I use this module with 240V AC? Yes, rated for 250V AC, 2A resistive.
• Q: What fusing is recommended? 3.0 A, 250V AC slow-blow (Littelfuse 239003).
• Q: Is it compatible with Modicon Quantum? Yes, via Flex adapter and appropriate cabling.
• Q: How do I know if the output is energized? Yellow status LED per channel.

Why Buy From Oiltech Controls?

• 15+ years in industrial automation spare parts.
• Global shipment support – FedEx, UPS, DHL available.
• All products are tested industrial surplus or refurbished.
• 12-month warranty on every module.
• Technical verification before shipment ensures reliability.
• We support obsolete control systems – including legacy PLCs.

Contact us: info@oiltechcontrols.com
or +86 158 8020 0923 (WhatsApp).

Packaging: module, terminal base (if ordered), and mounting hardware.
Warranty: 12 months from invoice date against manufacturing defects.
Shipping: FedEx, UPS, DHL – worldwide express delivery.

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