Product Overview
The Allen-Bradley 1746-OW16 is a SLC 500 Digital Contact Output Module engineered for reliable switching in mixed-voltage industrial environments. This module provides sixteen (16) Normally Open (N.O.) relay channels, organized into two output groups with eight channels per common. It accepts an operating voltage of 5-265V AC or 5-125V DC, making it a flexible choice for a wide range of control applications.
As part of the Rockwell Automation SLC 500 family, the 1746-OW16 delivers robust performance in discrete output control. Its relay contact outputs simplify integration with existing systems, reducing the need for interposing circuitry and lowering overall installation complexity.
Technical Specifications
| Specification |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number / Catalog No. |
1746-OW16 |
| Series |
SLC 500 |
| Module Type |
Digital Contact Output Module |
| Outputs |
16 |
| Operating Voltage |
5-265V AC or 5-125V DC |
| No. of Groups |
2 |
| Points per Group |
8 |
| Output Types |
N.O. Relay Contact |
| Applications |
Relay Contact Outputs (8 per Common) |
| Current/Output (120 VAC) |
1.5 amps |
| Step Response |
60 ms in, 2.5 ms out |
| Current/Output (24VDC) |
1.2 amps |
| Backplane Current |
170-180 milliamps |
| Signal Delay (max resistive load) |
On = 10.0 ms, Off = 10.0 ms |
Performance & Key Features
The 1746-OW16 offers several performance characteristics that make it a dependable choice for discrete output control:
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Mixed Voltage Operation: Supports both AC and DC loads, with the ability to operate one group on DC and the other on AC simultaneously.
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High Current Handling: Each output can handle up to 1.5 A at 120VAC and 1.2 A at 24VDC, suitable for driving relays, solenoids, and small motors.
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Fast Response: Step response of 60 ms in and 2.5 ms out ensures timely switching.
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Low Signal Delay: 10 ms on/off delay at maximum resistive load for consistent performance.
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Robust Construction: Designed to withstand industrial environments, with a removable terminal block for easy wiring.
Real-World Applications
The Allen-Bradley 1746-OW16 excels in applications where multiple voltage levels coexist, such as mixed AC/DC control panels. For example, it can switch 120VAC pilot lights while simultaneously driving 24VDC sensor circuits, eliminating the need for separate interposing relays.
In packaging machinery, the module controls solenoid valves and actuator coils, leveraging its 1.5 A per output capacity at 120VAC. Its two isolated groups allow one group to handle AC power while the other manages DC logic, simplifying wiring and reducing panel space.
For material handling systems, the 1746-OW16 provides reliable on/off control for conveyor motors and warning beacons. The 10 ms signal delay ensures precise timing in sequenced operations, and the 60 ms step response accommodates rapid cycling requirements.
Installation & Setup
Installing the 1746-OW16 is straightforward. The module fits directly into a SLC 500 chassis and requires no special tools. Use the removable terminal block to connect field wiring; secure connections with sliding latches, screws, or threaded connectors as provided.
Before powering up, verify that the operating voltage of each group does not exceed the module's rating (5-265VAC or 5-125VDC). Ensure that the backplane current draw (170-180 mA) is within your chassis power budget. For optimal performance, keep the module away from chemicals that could degrade its sealing materials.
Maintenance & Reliability
Regular inspection is key to extending the lifespan of the 1746-OW16. Periodically check for signs of chemical damage, as exposure to solvents or corrosive agents can compromise the module's sealing and lead to premature failure.
Verify that all wiring connections remain tight, as loose terminals can cause intermittent operation or arcing. The relay contacts are rated for mechanical and electrical endurance; however, frequent switching of high currents may accelerate wear. Monitoring output current levels and operating temperatures helps prevent overstress.
Installing external surge suppression devices on each channel is highly recommended. These devices protect the module from voltage spikes, reducing the risk of damage and improving long-term reliability.
Compatibility & Integration
The 1746-OW16 is designed for use with the Allen-Bradley SLC 500 programmable logic controller (PLC) platform. It communicates over the SLC 500 backplane, requiring no additional communication modules. The module is compatible with SLC 500 processors, including the 5/01, 5/02, 5/03, 5/04, and 5/05 series.
Because it uses relay contact outputs, the 1746-OW16 can switch a wide variety of loads without concern for polarity or voltage drop. This makes it an excellent choice for retrofitting older systems or integrating with third-party devices that require dry contacts.
Selection Guide & Purchasing Advice
When selecting the 1746-OW16, confirm that your application requires 16 discrete outputs with relay contacts. Verify the voltage range (5-265VAC or 5-125VDC) and current ratings (up to 1.5 A at 120VAC) meet your load requirements.
Check the backplane current consumption (170-180 mA) to ensure your chassis power supply can handle the additional load. Also, consider the number of output groups (2) and points per group (8) to match your wiring topology.
For genuine Allen-Bradley components and reliable supply, PLC Source PRO offers the 1746-OW16 with fast shipping and competitive pricing. Ensure you purchase from a reputable source to avoid counterfeit or refurbished units that may not meet performance specifications.