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FLEX I/O · AC DIGITAL OUTPUT
ALLEN-BRADLEY
1794-OA8
FLEX 8 Point Digital Output Module
The 1794-OA8 is an eight-point, non-isolated AC digital output module for the FLEX I/O platform. It is designed for switching 120V AC field loads through a distributed I/O architecture while maintaining a compact modular footprint.
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PRODUCT ID
1794-OA8
FLEX I/O AC DIGITAL OUTPUT
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Output Architecture
Eight AC output points are arranged as one non-isolated group. The module is intended for 120V AC field-side switching and operates within an 85…132V AC output range.
Output frequency: 47…63 Hz
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Current Handling
The module carries a 4.0A total output current rating, with up to 500mA per output at 55°C. At lower ambient temperatures, higher per-channel operating limits apply under the specified loading arrangement.
On-state minimum: 5.0mA per output
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Switching Response
Both OFF-to-ON and ON-to-OFF output signal delays are specified at a maximum of one-half AC cycle. Each channel has a yellow status indicator driven by logic-side circuitry.
Surge: 7A for 40ms, repeatable every 8 seconds
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| Parameter | 1794-OA8 | Parameter | 1794-OA8 |
| Number of outputs | 8, one group | Output isolation | No channel-to-channel isolation |
| Output voltage, minimum | 85V AC | Output voltage, nominal | 120V AC |
| Output voltage, maximum | 132V AC | Frequency | 47…63 Hz |
| Total output current | 4.0A | On-state current, minimum | 5.0mA per output |
| On-state current at 55°C | 500mA per output | On-state current at 35°C | 750mA per output |
| Special 30°C loading | 1.0A on 4 non-adjacent outputs + 500mA on 4 outputs | On-state voltage drop | 1.0V maximum @ 0.5A |
| Off-state leakage | 2.25mA maximum | Surge current | 7A for 40ms |
| Output delay OFF → ON | 1/2 cycle maximum | Output delay ON → OFF | 1/2 cycle maximum |
| FLEXBus current | 80mA @ 5V DC | Operating temperature | 0…55°C |
| Power dissipation | 4.1W @ 0.5A; 6.3W @ 0.75A / 1.0A | Thermal dissipation | 14.0 BTU/hr @ 0.5A; up to 21.4 BTU/hr @ 1.0A |
| Approx. module size | 46 × 94 × 53 mm | Approx. installed size | 94 × 94 × 69 mm |
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Field-Side Application Logic
The 1794-OA8 is suited to distributed AC output duties where an eight-point 120V AC interface is required within a FLEX I/O station. The module receives output commands through the FLEX I/O architecture and switches the corresponding field-side AC circuits.
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TARGET
1794-OA8
8 non-isolated outputs
85…132V AC 120V AC nominal 4.0A total rating |
ISOLATED VARIANT
1794-OA8I
8 isolated outputs
120V AC power class Channel-to-channel isolation Selected when individual channel isolation is required |
HIGHER POINT COUNT
1794-OA16
16 non-isolated outputs
220/240V AC class 4.0A module rating Different voltage and channel-density requirements |
DC OUTPUT FAMILY
1794-OB Series
Designed for DC output duties
Different field voltage class Different load interface requirements Not a direct AC electrical substitute |
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| 01 · Contact Window Please contact us within 7 days after receiving the item if any issue arises. |
02 · Return Condition Returned items should remain in original condition with a specific reason provided. |
03 · Replacement / Freight A return or replacement can be arranged after receipt of the returned item; return shipping is paid by the buyer. |
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Q1 · Is 1794-OA8 suitable when my existing FLEX I/O station needs an 8-point 120V AC replacement?
It is specifically an 8-point, non-isolated 120V AC output module for the FLEX I/O family. Before replacement, verify the terminal-base arrangement, field voltage, load current and the isolation requirement of the existing application.
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Q2 · When should I choose 1794-OA8 instead of 1794-OA8I?
The key electrical distinction is isolation. 1794-OA8 has no isolation between individual output channels, while 1794-OA8I provides channel-to-channel isolation. If individual channel isolation is part of the control design, the isolated variant should be evaluated instead.
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Q3 · Can 1794-OA8 drive a load near 500mA continuously at the upper temperature limit?
The specified maximum on-state current is 500mA per output at 55°C, with a 4.0A total module rating. Higher per-output limits are specified at lower temperatures, so the actual load profile and ambient temperature should be checked together rather than using the lower-temperature rating at 55°C.
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Q4 · Does 1794-OA8 include individual output fuses, or should I plan external protection?
The module outputs are not individually fused. Individual output fusing is required. For this module, a 1.6A, 250V AC slow-blow fuse arrangement is specified; compatible fused terminal-base options can also be considered where appropriate.
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Q5 · What should I verify before ordering 1794-OA8 for a high-availability control panel?
Confirm the exact catalog number, required 120V AC output class, eight-point capacity, non-isolated channel arrangement, terminal-base compatibility, expected field load current, ambient temperature and required output protection. These checks help prevent an AC/DC mismatch, an isolation mismatch or a terminal-base mismatch during replacement.
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