Allen Bradley 1771-OA /B AC Output Module 120V

Allen-Bradley 1771-OA/B AC Output Module 120V

The Allen-Bradley 1771-OA/B is an AC output module designed to interface with ON/OFF devices within the 1771 Universal I/O structure. This module is suitable for controlling devices such as limit switches, pushbuttons, motor starters, pilot lights, and annunciators.

Key Features

• Number of Outputs: 8
• Output Voltage Range: 92 to 138V AC at 47–63 Hz
• Output Current Rating: 1.5A per output, with a maximum of 6A per module
• Surge Current: 4A per output for 8.3 ms at 120V AC, repeatable every 1 second
• Minimum Load Current: 50 mA per output at 120V AC, 60 Hz
• On-State Voltage Drop: 2V at 100 mA
• Off-State Leakage Current: Maximum of 5 mA per output at 120V AC
• Signal Delay: Off-to-On: 1 ms; On-to-Off: 8.3 ms at 60 Hz
• Backplane Current Draw: 210 mA at 5V DC
• Power Dissipation: Maximum of 10.7W; Minimum of 1.1W
• Thermal Dissipation: Maximum of 36.6 BTU/hr; Minimum of 3.4 BTU/hr
• Opto-Electrical Isolation: 1500V AC RMS (2500V peak)

Installation and Compatibility

The 1771-OA/B module occupies a single slot in the 1771 I/O chassis and requires the 1771-WA field wiring arm for connections. It is compatible with various Allen-Bradley programmable controllers, facilitating seamless integration into existing systems. The module’s design supports high-power operations, meeting requirements for applications ranging from 10 to 276V AC.

Applications

This module is ideal for controlling AC motor starters, indicators, solenoids, and other ON/OFF devices in industrial automation settings. Its robust design ensures reliable performance, making it a valuable component in complex control systems.

Additional Information

The 1771-OA/B module features LED indicators for each output channel and a blown fuse indicator, aiding in system monitoring and troubleshooting. It utilizes keying pins between positions 4 and 6, and 12 and 14, and employs a 2A, 250V fuse for protection.

For detailed installation instructions and technical specifications, refer to the official Allen-Bradley documentation.