1794-OA8I Allen-Bradley FLEX I/O 8-Channel AC Output Module
Manufacturer: ABB
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Part Number: 1794-OA8I
Condition：New with Original Package
Product Type: Digital I/O Cards
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Country of Origin: Sweden
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Allen-Bradley 1794-OA8I FLEX I/O AC Output Module
Configured for distributed output control in FLEX I/O networks, the Allen-Bradley 1794-OA8I (1794-OA8I AC Output Module) provides direct physical electrical execution of 8 isolated digital output channels.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1794-OA8I |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.25 kg |
| Dimensions | 94 x 92 x 46 mm |
| Operating Temp | 0 deg C to +55 deg C |
| Power Consumption | 8 W (dissipation) |
| Output Channels | 8 (Isolated) |
| Output Current | 1 A continuous per channel |
| Surge Current | 10 A for 50 ms |
Industrial Control and Network Architecture
The 1794-OA8I utilizes individual channel galvanic isolation to prevent fault propagation across the I/O bus, ensuring that a short-circuit on one output does not de-energize or damage adjacent channels. The module supports I/O density scaling within the FLEX I/O platform, allowing for flexible configuration on standard terminal bases such as the 1794-TB3 or 1794-TB3S. High-speed firmware flash compatibility ensures the module maintains synchronization with the host adapter's scan rate, providing consistent turn-on and turn-off response times required for deterministic machine control sequences.
Frequently Asked Questions
Q: Can the 1794-OA8I be used to drive inductive loads directly?
A: Yes, each channel supports a continuous current of 1 A and an inrush surge of 10 A for 50 ms. However, ensure that inductive flyback is suppressed using appropriate MOVs or RC networks if the load exceeds these surge ratings.
Q: Is the module hot-swappable while the terminal base is energized?
A: The FLEX I/O system supports hot-swapping under normal conditions. Ensure that the terminal base is properly keyed to prevent the insertion of incompatible modules, which protects the circuitry from voltage-mismatch damage.
Field Installation Guidelines
- Terminal Base Preparation: Install the 1794-TB3 or 1794-TB3S terminal base onto a 35 mm DIN rail. Ensure the base is locked securely to provide a stable electrical interface for the module's backplane pins.
- Module Insertion: Align the module with the terminal base guide rails and press down until the locking mechanism engages. Verify that the module is flush with the base to guarantee full contact with the backplane bus.
- Wiring Practices: Use appropriate wire gauges for the 120/240 V AC load currents. Terminate all field wiring at the terminal base according to the provided I/O map, ensuring that the isolated channels are wired to their respective common return paths.
- Grounding: Establish a clean chassis ground connection at the terminal base. Proper grounding is necessary to mitigate surge voltage protection limits and prevent high-frequency electrical noise from interfering with the module's switching logic.