Product Overview
The Allen-Bradley 1746-OAP12 is a SLC500 Discrete AC output module designed for reliable switching of high-current AC loads. With twelve output channels arranged in six groups per common terminal, this module delivers 120/240VAC signal voltages to demanding industrial applications. Its robust construction and electronic fusing per common ensure operational continuity even when one group faults.
The 1746-OAP12 fits into any slot of a 1746 chassis and comes with a removable terminal block (RTB) for quick wiring and maintenance. Its internal fuse monitoring jumper allows you to enable blown-fuse detection, reducing downtime in critical processes.
Key Features & Benefits
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Twelve AC outputs – Six points per electronically fused common for isolated group operation.
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Wide voltage range – Operates from 85-265VAC at 47-63Hz, covering global power standards.
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High current capacity – 2.0A per point at 30°C, up to 9.0A per module.
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Modifiable fuse monitoring – Jumper-selectable to detect blown fuses and alert the processor.
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Fast response – 11ms OFF-to-ON and 1ms ON-to-OFF delay times.
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Removable terminal block – Simplifies installation and field replacement.
Technical Specifications
| Parameter |
Value |
| Part Number |
1746-OAP12 |
| Brand |
Allen-Bradley |
| Series |
SLC500 |
| Number of Outputs |
12 |
| Output Voltage |
120/240VAC |
| Operating Voltage Range |
85-264VAC |
| Output Delay OFF to ON |
11 ms |
| Output Delay ON to OFF |
1 ms |
| OFF-state Leakage Current |
2 mA |
| Minimum Load Current per Point |
10 mA |
| Backplane Current (5.1V) |
0.370 A |
| Continuous Current per Point |
2.0A @30°C, 1.25A @55°C, 1.0A @60°C |
| Continuous Current per Module (max) |
9.0A @30°C, 6.8A @55°C, 6.0A @60°C |
Industry Applications
The 1746-OAP12 excels in applications requiring high-current AC switching, such as motor starters, lighting control, and heating elements. For example, in a packaging line, it can drive multiple solenoid valves and conveyor contactors simultaneously, with each group isolated to prevent total shutdown if one fuse blows.
In HVAC systems, the module controls compressors and fans with its 120/240VAC outputs, while the fast response times ensure precise sequencing. Its wide operating temperature range (0-60°C) makes it suitable for factory floors and outdoor enclosures alike.
Installation & Setup
Install the 1746-OAP12 into any available slot of a 1746 chassis. Ensure the backplane power supply provides at least 0.370A at 5.1V. Connect the AC load wiring to the removable terminal block, observing the common grouping (six points per common). Set the fuse monitoring jumper: short pins 2 and 3 to enable blown-fuse detection; default pins 1 and 2 disable it.
For SLC5/02 and later processors, note that a fault routine cannot clear the major fault bit. The module's major fault bit is S:1/13, with fault code in S:6. When replacing a blown fuse, use the SAN-O HQ 6.3A fuse (UL/CSA rated) or the 1746-F9 fuse kit (five fuses per kit).
Maintenance & Reliability
Routine inspection of the 1746-OAP12 should include checking for loose connections, verifying output voltages, and monitoring fuse status if enabled. The module's electronic fusing per common provides a first line of defense, but periodic testing of the fuse monitoring jumper ensures early warning of failures.
Environmental considerations: the module operates at 5-95% relative humidity (non-condensing). Its shock rating of 30G and vibration withstand of 5G at 10-500Hz make it robust for industrial environments. Regular cleaning of the chassis and ensuring adequate airflow will extend service life.
Compatibility & Integration
The 1746-OAP12 works with all SLC500 processors, including SLC 5/01, 5/02, 5/03, 5/04, and 5/05. It integrates seamlessly into existing SLC500 systems, providing a straightforward upgrade path for older discrete output modules. Its backplane current requirement of 0.370A at 5.1V is compatible with standard SLC500 power supplies.
Selection Guide & Purchasing Advice
Before purchasing the 1746-OAP12, verify your system's backplane capacity and load requirements. Ensure the output voltage matches your field devices (120VAC or 240VAC) and that the total current per module does not exceed the derated values at your ambient temperature.
At PLC Source PRO, we stock genuine Allen-Bradley 1746-OAP12 modules with full traceability. Our technical team can assist with compatibility checks and application advice. Order today to keep your automation running.