Allen-Bradley 1746-OW16
- anadi automation
- Jul 5
- 3 min read
Comprehensive Overview of Allen-Bradley 1746-OW16 Relay Output Module for SLC 500 Systems
The Allen-Bradley 1746-OW16 is a 16-point relay output module designed for the SLC 500 Programmable Logic Controller (PLC) platform. Manufactured by Rockwell Automation, this module is engineered to deliver versatile, reliable control of external devices in industrial automation systems. It is widely used in discrete control applications where outputs need to drive different types of loads, including AC and DC devices.
What sets the 1746-OW16 apart is its use of electromechanical relay contacts. Unlike solid-state output modules, this relay-based design allows the module to switch both AC and DC voltages, making it extremely flexible. Each of the 16 output channels is individually isolated, which means different channels can be connected to different voltage levels or types—such as 120V AC on one output and 24V DC on another—without interference. This capability is particularly valuable in mixed-load systems where multiple types of field devices need to be controlled from a single module.
The module supports operating voltages from 5V DC to 125V DC, and 5V AC to 265V AC. This wide range ensures compatibility with a broad spectrum of industrial devices, including solenoids, pilot lights, contactors, and alarms. The maximum current per output point is 2.0 A, with a maximum current per module of 8.0 A, ensuring robust power handling. The relay contacts are rated for 30 VA at 125V DC and 276 VA at 120V AC, providing strong switching capability for both inductive and resistive loads.
Each output is protected by internal snubber circuitry to suppress voltage spikes caused by inductive loads, extending the lifespan of both the module and connected devices. Furthermore, the relay contacts are built for durability, with a mechanical life expectancy of over 20 million operations, and electrical life typically rated at 100,000 cycles at full load.
The 1746-OW16 includes status LEDs for each output channel, providing immediate visual feedback for system monitoring and troubleshooting. This simplifies diagnostics and helps operators quickly identify faults, minimizing system downtime and maintenance efforts.
Installation is straightforward, as the 1746-OW16 is designed to be directly inserted into any available slot in an SLC 500 chassis. The module communicates with the CPU via the SLC backplane, with no additional configuration required other than addressing within the controller logic. Wiring is done via a removable terminal block, making module replacement or maintenance convenient and reducing system downtime during servicing.
In terms of physical and environmental robustness, the 1746-OW16 is built to endure the demands of industrial settings. It operates in temperatures ranging from 0°C to 60°C (32°F to 140°F) and is rated to withstand high vibration and shock. It meets global certification standards, including UL, CSA, and CE, making it compliant for use in a variety of industrial regions and regulatory environments.
Typical applications for the 1746-OW16 include manufacturing automation, conveyor systems, HVAC controls, material handling, and process control. It is particularly well-suited for systems where electrical isolation between outputs or a combination of AC and DC loads is required. Its durability and versatility make it a trusted solution in both new installations and legacy system upgrades.
In conclusion, the Allen-Bradley 1746-OW16 relay output module delivers unmatched flexibility and reliability for controlling diverse load types within SLC 500 systems. Its wide voltage compatibility, individual output isolation, long relay life, and robust construction make it an essential component for engineers and automation professionals designing dependable and efficient control systems.
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