The 1794-OA8I from Allen-Bradley is a high-reliability FLEX I/O digital AC output module designed for distributed control architectures requiring isolated, medium-power AC switching. This 8-point module provides individually isolated outputs rated for 24-120V AC, each capable of 2A continuous load (up to 10A inrush for 10ms). It integrates seamlessly with the FLEX I/O backplane, supporting hot-swapping and reducing system downtime. The 1794-OA8I is ideal for harsh industrial applications such as valve control, motor starters, and solenoid banks, offering 1500V AC channel-to-channel isolation to prevent ground loops and cross-talk. Each output is fused and protected against short circuits, with LED indication for on/off status and fault detection. The module operates in a wide temperature range (-20°C to +60°C) and is compatible with 1794-TB3, 1794-TB6, or 1794-TB32 terminal bases.
| Parameter |
Specification |
| Product Type |
FLEX I/O Digital AC Output Module |
| Catalog Number |
1794-OA8I |
| Number of Outputs |
8 (individually isolated) |
| Output Voltage Range |
24-120V AC (47-63 Hz) |
| Output Current Rating (per point) |
2 A continuous (resistive); 10 A inrush for 10 ms |
| Total Current per Module |
8 A max (all outputs on) |
| Isolation Voltage (channel-to-channel) |
1500V AC (50/60 Hz, 1 minute) |
| Isolation Voltage (channel-to-backplane) |
1500V AC (50/60 Hz, 1 minute) |
| Output Type |
Triac (AC switching, zero-crossing turn-on) |
| Leakage Current (off-state) |
≤ 1.5 mA Standard Models 120V AC |
| Turn-On Time |
≤ 0.5 ms (zero-crossing) |
| Turn-Off Time |
≤ 0.5 ms (zero-crossing) |
| Protection |
Short-circuit protected (per channel); thermal shutdown |
| Fusing |
Internal fuse (non-replaceable) per output |
| Indicators |
Green LED per channel (output on); red LED for fault |
| Power Supply (module logic) |
5V DC from backplane (200 mA max) |
| Power Dissipation |
2.5 W typical (all outputs on) |
| Terminal Base Compatibility |
1794-TB3, 1794-TB6, 1794-TB32 |
| Operating Temperature |
-20°C to +60°C (-4°F to +140°F) |
| Storage Temperature |
-40°C to +85°C (-40°F to +185°F) |
| Relative Humidity |
5% to 95% (non-condensing) |
| Vibration Resistance |
5 g Standard Models 10-500 Hz (operating) |
| Shock Resistance |
30 g (11 ms half-sine) |
| Weight |
Approx. 0.15 kg (0.33 lb) |
| Certifications |
UL, cUL, CE, C-Tick, ATEX (Zone 2) |
What Does Our Clients Say
Mitsubishi MR-J4
Laura Navas
Great product!
2019/12/01
Keyence sensor
EQDR SALES
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2020/02/22