Solve Downtime with the Allen-Bradley 1746-OA8 Output Module
When a critical AC output point fails, production stops. The Allen-Bradley 1746-OA8 discrete AC output module restores control fast. As part of the trusted SLC 500 series, this module delivers eight outputs in two isolated groups of four. It handles 85-264 VAC, so it works with a wide range of industrial loads. With 185 mA backplane current, it integrates smoothly into existing racks.
Key Specs That Keep Your Line Running
The 1746-OA8 shines under real-world demands. Its wide 85-264 VAC output range eliminates the need for separate modules across different voltage systems. Each point carries 1.00 A at 30 °C and 0.5 A at 60 °C. The module total reaches 8.0 A at 30 °C and 4.0 A at 60 °C. Fast response matters: ON delay is 1 ms and OFF delay is 11 ms for resistive loads. A 10 A surge for 25 ms handles inrush currents from relays and solenoids. These specs mean fewer nuisance trips and longer equipment life.
Where the 1746-OA8 Delivers Value
This module excels in general-purpose applications. Use it to drive motor starters, solenoid valves, and indicator lamps on packaging lines. In material handling, it controls diverters and gates that must react quickly. For building automation, it switches fans and pumps across 85-264 VAC circuits. The 1746-OA8 replaces failed output modules without rewiring or downtime. That directly cuts maintenance costs and keeps your ROI strong.
Installation and Setup Tips
Mount the module in any SLC 500 chassis with available slots. Ensure the backplane provides 185 mA at 5 VDC. Wire outputs according to your field device voltage, staying within 85-264 VAC. Group outputs to balance load across the two groups of four. Verify tight terminal connections to prevent arcing. After power-up, test each channel with a known load to confirm switching.
Maintenance for Long-Term Reliability
Inspect terminals every six months for looseness or corrosion. Check for excessive heat near the module, especially if ambient exceeds 30 °C. At higher temperatures, derate per the current specifications to avoid thermal stress. Replace the module if outputs become intermittent or fail to switch. Keep spare 1746-OA8 units on hand to minimize downtime. This proactive approach protects your investment and supports lean maintenance budgets.
Compatibility and Integration
The 1746-OA8 works with SLC 500 processors and I/O racks. It communicates through the backplane, so no special configuration is needed. It fits alongside other SLC 500 discrete and analog modules. If you are upgrading from older output cards, verify backplane current capacity. The module’s standard form factor ensures drop-in replacement in most SLC 500 systems.
Selection Guide for Buyers
Before ordering, confirm your system uses SLC 500 series and has an open slot. Check that your load voltage falls within 85-264 VAC and current per point does not exceed 1.00 A at 30 °C. For high-temperature cabinets, plan for derating. SpareTechPLC stocks genuine Allen-Bradley modules and offers expert support. Contact us to verify availability and compatibility with your existing setup.
Frequently Asked Questions
What is the output voltage range of the 1746-OA8?
It operates from 85-264 VAC, covering common industrial voltages.
How many outputs does this module have?
It provides eight outputs in two groups of four channels each.
Can I use the 1746-OA8 in high-temperature environments?
Yes, but derate current: 0.5 A per point and 4.0 A per module at 60 °C.
What is the backplane current consumption?
It draws 185 mA at 5 VDC from the backplane.
Is this module compatible with all SLC 500 processors?
It works with SLC 500 systems that support discrete AC output modules.
