Allen Bradley 966210-01 12-120V AC Output Module 1771-OAD

Allen-Bradley 1771-OAD 12-120V AC Output Module

The Allen-Bradley 1771-OAD is a 12 to 120V AC output module designed for use within the PLC-2 series. This module utilizes zero-crossing technology, enabling it to activate outputs when the voltage is below a specified threshold, typically between 40 to 50V AC. This feature helps minimize stress on connected devices sensitive to current surges.

Key Features

• Output Channels: 18 discrete outputs.
• Voltage Range: Operates between 10 to 138V AC at frequencies of 47 to 63 Hz.
• Current Rating: Each output supports up to 2A, with a cumulative module limit of 8A.
• Surge Capacity: Can handle surge currents up to 25A per output for 100 milliseconds, repeatable every second.
• Power Requirements: Draws 295mA from the 1771 I/O chassis backplane power supply.

Compatibility

The 1771-OAD module is compatible with the following Allen-Bradley chassis:

• 1771-A1B through 1771-A4B or later I/O chassis
• 1771-AM1 and 1771-AM2 chassis

Note: This module is not compatible with the 1771-A1, 1771-A2, and 1771-A4 chassis models.

Additional Specifications

• Minimum Load Current: 5 mA per output.
• Off-State Leakage Current: Maximum of 3.0 mA at 138V AC.
• Power Dissipation: Ranges from 1.5W (minimum) to 13W (maximum).
• Thermal Dissipation: Between 5.13 BTU/hour (minimum) and 48.0 BTU/hour (maximum).

When integrating the 1771-OAD module with devices that include a single diode in series with the load, it’s recommended to place a 39 KOhm, 1 Watt shunt resistor across the load to ensure proper operation. Be aware that this resistor may cause the LED indicator to illuminate when the output is off; substituting the LED with an incandescent lamp can mitigate this effect.

For optimal performance and longevity, ensure that the total current draw from all modules within the I/O chassis does not exceed the backplane’s capacity. Proper installation and adherence to specified operating conditions will contribute to the reliable operation of the 1771-OAD module within your PLC system.