Versatile Isolated Relay Control for Critical Industrial Automation
The Allen Bradley 1746-OX8 SLC 500 Isolated Relay Output Module is designed to deliver dependable relay-based output switching for industrial automation systems that require enhanced electrical isolation and flexible load handling. As part of the trusted SLC 500 family, this module provides eight individually isolated relay outputs capable of controlling a broad range of AC and DC field devices.
Its isolated relay architecture helps improve operational stability while supporting diverse control applications involving contactors, alarms, indicators, motor starters, and other industrial equipment. The 1746-OX8 is widely selected for automation projects where reliability, electrical separation, and long-term performance are essential.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Allen Bradley |
| Model Number | 1746-OX8 |
| Module Type | Isolated Relay Output Module |
| Product Family | SLC 500 |
| Output Channels | 8 Individually Isolated Relay Outputs |
| Contact Configuration | Normally Open Relay Contacts |
| Output Voltage Range | 5–265 V AC / 5–125 V DC |
| Continuous Current per Output | 2 A Maximum |
| Continuous Current per Common | 8 A Maximum |
| Isolation Type | Channel-to-Channel Isolation |
| Relay Contact Material | Industrial-Grade Electromechanical Relay |
| Output Response Time | Approx. 10 ms |
| Mechanical Service Life | Up to 10 Million Operations |
| Backplane Current Draw | Approx. 85 mA at 5 V DC |
| Wiring Interface | Removable Terminal Block |
| Installation Method | SLC 500 Chassis Mounting |
| Operating Temperature | 0°C to +60°C |
Typical Applications
The 1746-OX8 module is widely used in industrial environments where isolated relay control is required for multiple field devices.
Common applications include:
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Industrial machine automation
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Motor control interface systems
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Packaging and processing equipment
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Conveyor and material handling systems
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Water and wastewater facilities
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Utility monitoring and control systems
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HVAC automation platforms
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Manufacturing production lines
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Alarm and annunciation systems
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Building management infrastructure
Its isolated relay outputs allow flexible integration with mixed-voltage control circuits while helping improve system reliability.
Key Benefits
Individual Output Isolation
Each relay channel is electrically isolated, helping reduce signal interference and improve overall control stability.
Flexible AC and DC Load Switching
Supports a wide range of industrial load types without requiring specialized output hardware.
Reliable Electromechanical Relay Design
Provides dependable switching performance for demanding industrial control applications.
Compact SLC 500 Integration
Fits directly into standard SLC 500 chassis systems, simplifying installation and expansion projects.
Improved System Protection
Isolation between channels helps minimize the impact of field-side electrical disturbances.
Long Operational Service Life
Built with durable relay components designed for continuous industrial operation.
Maintenance-Friendly Diagnostics
Front-panel indicators provide quick visual verification of output channel status.
Technical FAQs
1. What is the main function of the 1746-OX8 module?
It provides eight isolated relay outputs for controlling industrial field devices within SLC 500 PLC systems.
2. How many output channels are available?
The module includes 8 relay output channels.
3. What makes the 1746-OX8 different from standard relay output modules?
Each output channel is individually isolated for improved electrical separation and application flexibility.
4. Can it switch both AC and DC loads?
Yes, it supports switching of both AC and DC devices within rated operating ranges.
5. What is the maximum current rating per output?
Each relay output supports up to 2 A continuous current.
6. Is external power required for field devices?
Yes, connected loads require an external power source.
7. What types of devices can be controlled?
Relays, contactors, indicators, alarms, solenoids, and similar industrial devices.
8. Does the module include status indicators?
Yes, LED indicators provide channel status monitoring.
9. Is it compatible with all SLC 500 processors?
Yes, it is designed for integration across standard SLC 500 control systems.
10. What is the primary advantage of this module?
Its individually isolated relay outputs provide flexible and reliable control for diverse industrial applications.
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