Product Overview
The Allen-Bradley 1746-OX8 is a Digital Contact Output Module from the SLC 500 series, manufactured by Rockwell Automation. This module provides 8 normally open (N.O.) relay contact outputs designed for individually isolated, high-current relay applications. It operates on a versatile voltage range of 5-265 Volt AC or 5-125 Volts DC, making it suitable for diverse industrial control systems. Engineers often choose this component for its robust relay switching capabilities in automation environments.
Technical Specifications Breakdown
Key parameters for the 1746-OX8 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Brand | Allen-Bradley |
| Series | SLC 500 |
| Module Type | Digital Contact Output Module |
| Operating Voltage | 5-265 Volt AC or 5-125 Volts DC |
| Number of Outputs | 8 |
| Output Type | N.O. Relay Contact |
| Current per Output (120 VAC) | 3 amps |
| Current per Output (24VDC) | 1.2 amps |
| Backplane Current | 85-90 milliamps |
| Step Response | 60 milliseconds in, 2.5 milliseconds out |
| Operating Shock | 10 g |
Industry Applications
This module excels in applications requiring high-current relay switching with individual isolation. Common uses include motor control centers, conveyor systems, and packaging machinery where each output must handle up to 3 amps at 120V AC. The 1746-OX8's 8 N.O. relay contacts allow for direct control of solenoids, contactors, and indicator lights in discrete manufacturing processes. Its step response of 60 ms in and 2.5 ms out ensures reliable timing in sequential operations.
Installation & Setup Guidance
Mount the 1746-OX8 in a compatible SLC 500 chassis. Always remove or install the module only when power is removed from the chassis to prevent damage. Ensure the backplane current consumption of 85-90 milliamps is within the chassis power supply capacity. The module uses an open-type enclosure, so install it in a clean, dry environment to maintain reliability.
Maintenance & Reliability
Periodically inspect the module for signs of overheating or relay wear, especially in high-cycle applications. The operating shock rating of 10 g indicates robust mechanical design for industrial environments. Keep the surrounding air temperature within the specified range (0 to 60 degrees Celsius) to ensure optimal performance. No special cleaning or disassembly is required beyond standard visual checks.
Compatibility & Integration
The 1746-OX8 integrates seamlessly with SLC 500 processors and other I/O modules in the same chassis. It communicates via the backplane, requiring no additional protocol configuration. The module's N.O. relay outputs are compatible with both AC and DC loads within the specified voltage ranges, simplifying system design.
Selection Guide & Purchasing Advice
When selecting the 1746-OX8, consider your load requirements: each output can handle 3 amps at 120V AC or 1.2 amps at 24V DC. For higher currents or different voltage levels, review the full relay contact ratings in the product documentation. SpareTechPLC offers this module for your automation needs. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
Troubleshooting & Common Issues
If an output fails to energize, check the load wiring and verify the operating voltage is within 5-265V AC or 5-125V DC. Use the module's status indicators to confirm backplane communication. If multiple outputs fail, inspect the backplane current draw (85-90 milliamps) and ensure the chassis power supply is adequate. For persistent issues, consult the SLC 500 system manual.
