Allen-Bradley 1746-OW8 SLC 500 Digital Contact Output Module Buyer's Guide

Product Introduction

When your SLC 500 system requires reliable switching of diverse voltage loads, the Allen-Bradley 1746-OW8 provides a flexible solution. This digital contact output module features eight normally open relay channels, each capable of handling 5-265 Volt AC or 5-125 Volts DC. It eliminates the need for interposing relays in mixed-voltage applications, saving panel space and reducing costs. As part of the SLC 500 family, it integrates seamlessly with SLC 5/01 through SLC 5/05 controllers and remote I/O chassis.

Technical Specifications Breakdown

The 1746-OW8 operates on an AC/DC relay voltage category. Key specs include:

Operating Voltage: 5-265 Volt AC or 5-125 Volts DC

Backplane Current: 0.85-0.9 A (5V DC: 85 mA, 24V DC: 90 mA)

Output Configuration: 8 outputs in 2 groups with 4 points per common

Signal Delay: 10.0 ms ON and OFF at maximum resistive load

Heat Dissipation: 3.7 Watts maximum, 0.138 Watts per point

These parameters ensure the module can handle mixed AC/DC loads while maintaining low power consumption and predictable switching performance.

Industry Applications

The 1746-OW8 excels in manufacturing lines where different voltage zones exist. For example, in a packaging facility, one group can switch 120 VAC motors while the other controls 24 VDC sensors—all from a single module. Its 8 outputs per module reduce wiring complexity compared to using separate relays. This cost-benefit advantage lowers total installed cost and simplifies maintenance.

Installation & Setup Guidance

Install the 1746-OW8 in any SLC 500 chassis slot. For remote I/O configurations, reserve slot 0 for a communication adapter. Use surge suppression devices to maximize relay lifespan. The module is open-type equipment, so mount it in an enclosure with pollution degree 2 or better. Always disconnect power before servicing.

Maintenance & Reliability

The 1746-OW8 relay contacts have a mechanical life of millions of operations. Operating temperature range is -25 to 60 °C (-13 to 140 °F), with non-operating storage from -40 to 85 °C (-40 to 185 °F). Relative humidity tolerance is 5-95% non-condensing. Periodic inspection of relay operation and surge suppression devices ensures long-term reliability.

Compatible Systems

This module works with SLC 5/01, 5/02, 5/03, 5/04, and 5/05 processors. It also functions in remote I/O chassis using a communication adapter in slot 0. The 1746-OW8 occupies a single slot regardless of chassis type.

Selection Guide & Purchasing Advice

Before purchasing, verify your system voltage requirements. The 1746-OW8 supports 5-265 VAC or 5-125 VDC per channel. For complete technical specifications, contact BluePLC Industrial. We offer genuine Allen-Bradley modules with fast shipping and expert support to help you select the right I/O for your application.