Products Specifications
| Attribute | 1794-OA8I |
|---|---|
| Number of outputs | 8, isolated |
| Recommended terminal base | Same as 1794-OA8 |
| Output current rating | 4.0 A (8 outputs @ 500 mA) |
| On-state current (min) | 5.0 mA per output |
| On-state current (max) | Same as 1794-OA8 |
| On-state voltage drop (max) | 1.0 V @ 0.5 A |
| Surge current | 7 A for 40 ms, repeatable every 8 s |
| Off-state leakage current (max) | 2.25 mA |
| Isolation voltage | 120 V continuous, field-to-backplane & channel-to-channelTested @ 1250 V AC for 60 s |
| FlexBus current | 80 mA @ 5 V DC |
The Allen-Bradley 1794-OA8I is an 8-channel isolated AC digital output module designed for FLEX I/O systems requiring reliable control of 120V AC loads. Each output channel is electrically isolated, providing enhanced protection against electrical noise, ground loops, and channel-to-channel interference in demanding industrial environments.
The module supports a total output current rating of 4.0 A, with up to 500 mA per output, making it suitable for driving contactors, relays, solenoids, and motor starters. With a low on-state voltage drop of 1.0 V at 0.5 A and a minimum on-state current of 5 mA, the 1794-OA8I ensures efficient and stable switching performance. It features robust surge handling capability of 7 A for 40 ms and offers continuous isolation voltage of 120 V, tested at 1250 V AC. Compatible with multiple FLEX I/O terminal bases, the 1794-OA8I is an ideal solution for flexible, space-saving, and high-reliability output applications.
Contact Information
Our address
32D floor, Guomao Building, No.388, Hubin South Road, Siming District, Xiamen
Phone Number(Wechat/Whatspp)
+ 86 18030132586
cn@mooreplc.com
Installation Guide
Connect wiring to the different terminal bases as follows:
1. For 1794-TB2, 1794-TB3, or 1794-TB3S – Connect individual output wiring to the even-numbered terminals on the 0…15 row (A).
2. For 1794-TBN or 1794-TBNF – Connect individual output wiring to the even-numbered terminals on the 16…33 row (B).
3. For 1794-TB2, 1794-TB3, or 1794-TB3S – Connect the associated V AC power lead (L1) to the corresponding odd-numbered terminal on the 0…15 row (A)
4. For 1794-TBN or 1794-TBNF – Connect the associated VAC power (L1) lead to the odd-numbered terminals on row (C).
FAQ
The 1794-OA8I features channel-to-channel and field-to-backplane isolation, which significantly reduces electrical noise, prevents ground loops, and improves system reliability in harsh industrial environments.
Channel isolation protects each output independently, ensuring that a fault or surge on one channel does not affect adjacent outputs, making the module ideal for critical control applications.
The 1794-OA8I is compatible with multiple FLEX I/O terminal bases, including 1794-TBN, 1794-TBNF, 1794-TB2, 1794-TB3, and related variants.
Each output supports up to 500 mA, with a total module current rating of 4.0 A across all eight channels.
With a low on-state voltage drop of 1.0 V at 0.5 A and a surge current capability of 7 A for 40 ms, the module delivers stable and reliable AC output switching.
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