Allen Bradley 1771-OAN Digital AC Output Module

Primary System Capabilities of the Allen-Bradley 1771-OAN

Product Presentation

The 1771-OAN is an Allen-Bradley discrete output module compatible with the PLC5 product family. This high-density output module features 32 channels, each 1.0A, 2.0A per group, and 8.0A per module. The module comprises 4 groups, each with 8 channels. It can only be installed in 1771 chassis (e.g., 1771-A1B to A4B) or newer 1771 I/O chassis. The module operates at 120/240VAC, with a voltage range of 85 to 264VAC and a frequency of 47-63 Hz.

Essentially a 32-bit module, each channel represents one bit of processor memory. Compared to other output modules, this module provides higher output current, making it suitable for driving electrical loads. The front panel of the module features 32 LEDs, each representing one channel. These indicator lights visually show whether the output is powered, aiding in troubleshooting.

Each output group of this module has a built-in fuse that can be replaced if damaged. Typically, when a fuse fails, that output group will completely fail, while the other three output groups will continue to function normally. This isolation mechanism is a practical I/O segmentation function that can be used to plan output allocation.

Technical Support FAQ

Question1. What are the key operating characteristics of the Allen Bradley 1771-OAN in industrial output modules?

Answer: The Allen Bradley 1771-OAN is a high-performance AC output module designed for PLC-5 systems, reliably controlling discrete output devices. It employs switching technology based on a triac (Tri-Controlled Rectifier) ​​switch, efficiently handling AC loads and providing strong electrical isolation and consistent signal integrity.

Question2. What are the voltage and current specifications that differentiate the Allen Bradley 1771-OAN from other output modules?

Answer: The Allen Bradley 1771-OAN typically supports 120V AC output and has rated current per channel and total module current limits. Its design accommodates multiple output points, ensuring balanced load distribution and preventing overheating through carefully designed current limiting.

Question3. How does the Allen Bradley 1771-OAN achieve seamless integration with the PLC-5 architecture?

Answer: The Allen Bradley 1771-OAN is designed for compatibility with the 1771 I/O chassis, allowing for easy installation into PLC-5 systems. Its backplane communication architecture ensures deterministic data exchange and synchronized control in automation networks.

Question4. What types of industrial loads is the Allen Bradley 1771-OAN best suited for controlling?

Answer: The Allen Bradley 1771-OAN is ideal for controlling AC-powered equipment such as solenoid valves, contactors, indicator lights, and motor starters. Its three-terminal bidirectional SCR rectifier output design ensures reliable switching between resistive and moderately inductive loads.

Question5. What diagnostic or status indication functions are built into the Allen Bradley 1771-OAN?

Answer: The Allen Bradley 1771-OAN is equipped with LED status indicators for each output channel, providing real-time display of output status. This facilitates rapid troubleshooting, commissioning, and maintenance in complex industrial systems.

For those interested, we welcome you to contact us through the following avenues:

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