Allen-Bradley 1771-OA Digital Output Module

The Allen-Bradley 1771-OA is an AC output module that belongs to the 1771 I/O module series. It is designed for use with PLC5 Programmable Logic Controllers (PLCs) and provides eight output channels to manage various industrial devices. The module is capable of outputting a voltage range of 92-138V AC at a frequency of 47-63Hz, making it suitable for a range of applications.

Key Features

• Eight Output Channels: Provides eight channels for output control.
• Voltage Output Range: Delivers an AC voltage range from 92V to 138V at 47-63Hz.
• Current Rating: Each output can handle 1.5A, with the total current of the module not exceeding 6A.
• Surge Current: Can withstand surge currents of up to 4A per output for 8.3 ms, which is repeatable every second.
• Backplane Current: Draws 210mA at 5V DC from the backplane.

Applications

The 1771-OA module is ideal for energizing electrical devices such as:

• Solenoid actuated devices
• Indicating lights
• Sounding devices (e.g., horns, buzzers, sirens)
• Magnetic contactors and relays (typically AC voltage operated)

This module is suitable for use in industrial environments where reliable AC power is required to drive panel components and other equipment.

Specifications 

Specification	Value
Outputs per Module	8
Module Location	1771 I/O chassis
Output Voltage Range	92 to 138V AC @ 47-63Hz
Output Current Rating	1.5A per output (max. 6A/module)
Surge Current	4A per output for 8.3ms at 120V AC, repeatable every 1 second
Load Current (min.)	50mA per output @ 120V AC
On-State Voltage Drop	2V at 100mA
Off-State Leakage Current (max.)	5mA per output @ 120V AC
Signal Delay (Off to On)	1.0ms
Signal Delay (On to Off)	8.3ms @ 60Hz
Power Dissipation	10.7W (max.), 1.1W (min.)
Thermal Dissipation	36.6 BTU/hr (max.), 3.4 BTU/hr (min.)
Backplane Current	210mA @ 5V DC ±5%
Isolation Voltage	Meets or exceeds UL 508 & CSA C22.2 No. 142
Operational Temperature	0º to 50ºC (32º to 140ºF)
Storage Temperature	-40º to 85ºC (-40º to 185ºF)
Relative Humidity	5% to 95% (without condensation)
Wire Size	14 gauge (2mm²) stranded max.
Wire Insulation	3/64 inch (1.2mm) max.
Keying	Between 4 and 6, Between 12 and 14
Fuse	2A, 250V Buss AGC-2 fuse (Littlefuse Part No. 312002)
Field Wiring Arm	Catalog Number 1771-WA
Wiring Arm Screw Torque	7-9 inch-pounds

Environmental Conditions

• Operating Temperature: 0º to 50ºC (32º to 140ºF)
• Storage Temperature: -40º to 85ºC (-40º to 185ºF)
• Relative Humidity: 5% to 95% (without condensation)

Status Indicators

• Fuse-Blown Indicator
• Status Indicators for Output Channels (0 through 7)

Connection Diagram Example

The 1771-OA module can be connected with other modules, such as the 1771-IAD input module and 1771-DA output module. Here’s a sample connection diagram for driving a 1771-IAD module using a 1771-OA module:

• AC/DC (120V) Input Module: 1771-IAD
• AC (120V) Output Module: 1771-DA
• Resistor: 2.5K ohm, 10 Watt

Certifications

• CSA certified (when product or packaging is marked)
• CSA Class I, Division 2, Groups A, B, C, D certified
• UL listed
• CE marked for all applicable directives

Installation Notes

Refer to the system-level installation manual for guidance on planning conductor routing. Ensure that the conductor-category information is followed for proper installation.

Revisions

• 1771-OA Ser A: 1771-OA/A, Series A, Rev A
• 1771-OA Ser B: 1771-OA/B, Series B, Rev B
• 1771-OA Ser C: 1771-OA/C, Series C, Rev C

For any further inquiries or questions, please don’t hesitate to Contact Us.

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