Product Summary
The Allen-Bradley 1794-OA8I Flex I/O Digital Output Module provides eight isolated outputs. It switches 120V AC loads for industrial actuators. This module directly interfaces your PLC logic to field devices. Its isolated design ensures robust signal integrity and system safety.
Procurement Guide for the 1794-OA8I Module
Selecting the 1794-OA8I ensures reliable control for AC loads. Each of the eight outputs delivers up to 500 mA. The total module rating reaches 4.0 Amps. This module provides an output voltage of 120V AC nominal. It requires a compatible terminal base, such as the 1794-TB3.
The 1794-OA8I module offers key electrical specifications. Its on-state voltage drop is just 1.0V at 0.5A. The off-state leakage current is only 2.25 mA maximum. This module features a continuous isolation voltage of 120V. It can withstand 1250V AC for 60 seconds between channels.
This module draws 80 mA from the 5V DC Flexbus. Power dissipation sits at 4.1 Watts at 0.5A. Thermal dissipation equals 14.0 BTU/hr at 0.5A. You must use a slow-blow fuse rated at 1.6A and 250V AC. These specs allow for efficient and safe operation.
The 1794-OA8I operates in environments from -20 to 55 degrees Celsius. Its compact dimensions are 94 x 94 x 69 mm. This module integrates into any standard Flex I/O rack. It provides a direct link between your controller and the process.
User & Installation Guide for the 1794-OA8I
First, mount the terminal base on a DIN rail. Secure the 1794-OA8I module to that base. Set the keyswitch on the terminal base to Position 8. This ensures correct mechanical alignment and electrical connection.
Wire each isolated output to an even-numbered terminal. Connect the 120V AC power to the adjacent odd number. Connect the 120V AC common to each output device. This wiring method guarantees correct polarity and load control.
Observe the yellow LED indicator on the module's field side. This LED lights up when an output is in the active state. Use this visual feedback for quick diagnostics. This simplifies troubleshooting during commissioning and normal operation.
The recommended terminal base includes the 1794-TB3. This base provides screw clamp connections for secure wiring. It supports up to 10 Amperes of current capacity. This combination ensures a robust and reliable physical connection.
