Get now the 1794-OA16, a robust 16-point discrete output module designed to drive AC loads within an industrial automation network. This module provides a reliable interface for controlling solenoids, motor starters, and indicators directly from a FLEX I/O backplane.
What Is the 1794-OA16?
The 1794-OA16 is a digital AC output module that provides 16 non-isolated outputs in a single, compact form factor. It is specifically designed to work with the Allen-Bradley FLEX I/O system, offering a modular approach to distributed control. This module facilitates the switching of 120V AC power to field devices based on the logic processed by a central PLC or PAC.
Key Technical Specifications
- Number of Outputs: 16 (Non-isolated)
- Voltage Range: 74V AC to 132V AC
- Output Current Rating: 4.0A maximum per module (250mA per channel)
- Surge Current: 7A for 45ms (repeatable every 8 seconds)
- Off-State Leakage: 2.25mA maximum
- Voltage Drop: 1.0V AC at 0.5A
- Power Dissipation: 4.7W at maximum load
Architecture and Safety
The 1794-OA16 is built for efficiency, featuring a small footprint that reduces enclosure costs. It utilizes the FLEXBus for communication with the network adapter. Safety is paramount; the module features an internal fuse for protection against overcurrent, though external fusing for each output is highly recommended to protect specific field devices and wiring.
Expert Tips
Be aware of the «Off-State Leakage Current» (2.25mA). In some cases, low-wattage LED indicators or high-impedance relays may remain energized or flicker even when the output is «OFF». If this occurs, install a 10k-15k Ohm, 2W bleeder resistor in parallel with the load to ensure a clean state transition.
Frequently Asked Questions
Q: What terminal base is required for the 1794-OA16?
A: It is compatible with the 1794-TBN and 1794-TBNF terminal bases. The 1794-TBNF is preferred if you require on-board fusing for each individual output circuit.
Q: Can the outputs be used for DC loads?
A: No, the switching components in the 1794-OA16 are triacs, which require an AC zero-crossing to turn off. They will not function correctly with DC power.
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