OVERVIEW

Official designation: Allen-Bradley 1746-OW8 (SLC 500, Digital Contact Output Module)

The 1746-OW8 is a relay output module for the SLC 500, featuring eight Normally Open channels organized into two isolated groups. It supports control of both AC (up to 265V) and DC (up to 125V) field devices.

KEY SPECS SUMMARY

Power: 5V DC, 120 mA (backplane)

Interfaces / Ports: One 20-pin connector

Indicators: Eight output status LEDs

Operating Temp: 0 to 60 degrees C

Platform / Compatibility: SLC 500 modular hardware

Limit: 8 relay outputs; 2 isolated groups

Lifecycle: Active replacement part

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the maximum current rating for a single relay output channel on the 1746-OW8?

A: The maximum output current per point is rated at 2.0 A resistive load.

Wiring & Installation:

Q: Why must the 1746-OW8 be wired using the two isolated output groups?

A: The isolation allows the module to control loads using two different voltage levels or power sources.

Troubleshooting & Compatibility:

Q: What does a flashing status LED on one of the output channels typically signify?

A: A flashing LED indicates a potential issue with the field wiring or an excessive load current on that channel.

Replacement & Upgrades:

Q: When upgrading from the 1746-OW8, what is the main consideration for relay outputs?

A: Modernizing often involves selecting a compatible ControlLogix or CompactLogix relay output module.