Product Overview
The Allen-Bradley 1756-OA16 is a ControlLogix digital AC output module engineered for demanding industrial automation applications. With 16 individually fused output points arranged in two groups of eight, this module delivers dependable switching for 74-265V AC loads. Each point handles up to 0.5 A at 60 °C, while the module supports a total of 4 A. Built for the ControlLogix platform, the 1756-OA16 integrates seamlessly into local or remote chassis, providing precise control and diagnostics for your process.
Key Features & Benefits
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16 mechanically fused outputs – protect each channel and simplify troubleshooting.
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Wide operating voltage range – 74-265V AC, compatible with global power systems.
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Programmable output delay – 9.3 ms (off-to-on) or 11 ms (on-to-off) for timing flexibility.
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Fault diagnostics – FuseBlown and FieldPwrLoss tags alert operators to issues.
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Multiple removable terminal blocks – supports 1756-TBNH, 1756-TBSH, and 1756-TBCH.
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Pilot duty rated – suitable for solenoid valves, relays, and contactors.
Technical Specifications
| Parameter |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Series |
ControlLogix |
| Part Number |
1756-OA16 |
| Module Type |
Digital AC Output Module |
| Number of Outputs |
16 (mechanically fused) |
| Voltage Category |
120/240V AC |
| Operating Voltage Range |
74-265V AC |
| Output Current per Point |
0.5 A @ 60 °C |
| Output Current per Module |
4 A @ 60 °C |
| Isolation Voltage |
50V continuous |
| Backplane Current (5V) |
400 mA |
| Backplane Current (24V) |
2 mA |
| Power Dissipation (Max) |
6.5 W @ 60 °C |
| Enclosure |
None |
| Removable Terminal Blocks |
1756-TBNH, 1756-TBSH, 1756-TBCH |
Applications
The 1756-OA16 excels in discrete control applications across manufacturing, material handling, and process industries. Typical uses include:
- Energizing solenoid-operated valves and pneumatic actuators.
- Switching motor contactors and relay coils.
- Controlling indicator lights and alarm panels.
- Interfacing with PLC/DCS systems for machine sequencing.
Its wide voltage range and fused outputs make it ideal for retrofitting legacy panels or upgrading to ControlLogix.
Installation & Setup
Mount the 1756-OA16 directly into any ControlLogix chassis (e.g., 1756-A4, A7, A10, A13, A17). Ensure the chassis is properly grounded and the module is seated firmly. Select the appropriate removable terminal block (RTB) for your wiring needs – the 1756-TBNH or 1756-TBSH (or 1756-TBCH). Wire field power and outputs per the wiring diagram, observing the isolation voltage of 50V continuous. After installation, configure the module in your ControlLogix programming software, setting output delay times as required.
Maintenance & Reliability
The 1756-OA16 is designed for long service life with minimal maintenance. Periodically inspect the module for dust accumulation and ensure adequate ventilation. Check fuses if a point fails; the FuseBlown tag simplifies identification. Operate within the specified temperature range (32-140 °F) and relative humidity (5-95% non-condensing) to maintain reliability. The module's fused outputs protect against overcurrent, reducing downtime.
Compatibility & Integration
This module is compatible with all ControlLogix processors and communication modules, including partner modules. It can be installed in local or remote I/O chassis, allowing flexible system architectures. The 1756-OA16 also works alongside GuardLogix safety controllers when configured appropriately.
Selection Guide
When ordering the Allen-Bradley 1756-OA16, verify your chassis type and RTB requirements. Confirm the operating voltage matches your field power (74-265V AC). For high-inrush loads, consider interposing relays to protect the module. PLC Source PRO offers genuine 1756-OA16 modules with fast shipping and competitive pricing – a trusted partner for your automation spares.