Product Overview
When outdated output modules cause production bottlenecks or require frequent maintenance, the Allen-Bradley 1746-OA16 Digital AC Output Module provides a direct and cost-effective upgrade path for your SLC500 control system. This module delivers sixteen AC output channels arranged in two isolated groups of eight, supporting nominal voltages of 120/240 VAC with an operating range of 85–264 VAC. By replacing legacy output cards with the 1746-OA16, you gain enhanced reliability, simplified wiring, and seamless integration into existing SLC500, CompactLogix, or ControlLogix architectures.
Technical Specifications
The Allen-Bradley 1746-OA16 is engineered for demanding industrial environments. Key parameters include:
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Outputs: 16 (two groups of eight)
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Output Voltage: 120/240 VAC
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Operating Voltage Range: 85–264 VAC
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Backplane Current at 5.1 V: 0.370 A
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Continuous Current per Point: 0.50 A @ 30°C, 0.25 A @ 60°C
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Continuous Current per Module: 8.0 A @ 30°C, 4.0 A @ 60°C
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Off-State Leakage Current: 2 mA
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ON Delay: 11.0 ms; OFF Delay: 1 ms
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Ambient Operating Temperature: 32–140°F (0–60°C)
These specifications ensure the 1746-OA16 handles typical AC loads such as motor starters, solenoids, and indicator lights with minimal heat dissipation and low leakage.
Industry Applications
The 1746-OA16 excels in upgrading material handling, packaging, and assembly lines that rely on SLC500 controllers. For example, in a bottling plant, replacing older DC output modules with this unit simplifies wiring to AC actuators and reduces the need for intermediary relays. The two isolated output groups allow mixing of different load circuits, improving safety and flexibility. In a warehouse conveyor system, the module’s high inrush capacity (10 A surge for 25 ms) ensures reliable engagement of motor contactors without nuisance tripping.
Installation & Setup Guidance
Installing the Allen-Bradley 1746-OA16 is straightforward. Mount the module in any available single slot of the SLC500 chassis, ensuring the power supply can handle the additional backplane current of 0.370 A. Use the removable terminal block to connect field wiring – this feature allows module replacement without disconnecting wires. Verify that the load voltage falls within 85–264 VAC and that each output stays within the current derating curve (0.5 A per point at 30°C, 0.25 A at 60°C). The LED indicators on the front panel provide immediate output status feedback, aiding commissioning.
Maintenance & Reliability
The 1746-OA16 incorporates optical coupling and filter circuitry to suppress electrical noise, reducing false triggering and extending contact life. To maximize uptime, periodically inspect the module for loose connections and check for debris on the ventilation slots. Because the module uses solid-state switching, there are no mechanical contacts to wear out – a significant reliability improvement over older relay-based output cards. This longevity directly contributes to lower lifecycle costs. If an upgrade includes multiple 1746-OA16 modules, the total current draw per chassis must remain within the power supply capacity.
Compatibility & Integration
The Allen-Bradley 1746-OA16 integrates natively with all SLC500 processors, as well as CompactLogix and ControlLogix PACs when used with appropriate communication adapters. It occupies 16 bits of I/O memory and supports ladder logic programming. No additional software configuration is required beyond rack layout and addressing. The module’s removable terminal blocks accept standard screw-clamp wiring, making it compatible with existing field terminations.
Selection Guide & Purchasing Advice
Before ordering the 1746-OA16, verify your system’s backplane current budget and ensure the ambient temperature in the panel does not exceed 60°C. For installations requiring more than 16 output points, multiple modules can be stacked without limit, provided the power supply can handle the total load. At UBEST Automation, we stock genuine Allen-Bradley units with fast shipping. Contact us for volume pricing or assistance with system integration.