Allen-Bradley 1771-OFE3 | PLC 5 Analog Output Module

Product Overview

The 1771-OFE3 from Allen-Bradley / Rockwell Automation is a high-performance analog output module in the PLC 5 series. This module provides four isolated differential outputs with 1000V isolation, ensuring precise analog control in industrial automation systems.

It converts 12-bit binary and 4-digit BCD values into analog signals, enabling seamless operation with devices such as motor controllers, valve actuators, and signal converters. The 1771-OFE3 operates entirely from the I/O chassis backplane, eliminating the need for external power.

This module supports fast block transfer programming, allowing efficient data movement between the processor and module. With channel update times of 8 ms per 4 channels for BCD and 1.6 ms per 4 channels for Natural Binary, it ensures rapid and accurate analog output updates.

The 1771-OFE3 includes a wiring arm for module replacement without disconnecting field wiring, and keying bands secure it into any slot in a 1771 I/O chassis. A red fault LED and green power LED provide intuitive status indicators, and 1500V optoelectrical isolation safeguards against overvoltage conditions.

Technical Specifications

Key Features

• 4 Isolated Differential Outputs: 1000V isolation for precise analog control.

• Flexible Data Formats: Supports Natural Binary or BCD with ±9999 scaling.

• Fast Channel Update: 1.6–8 ms updates ensure responsive analog output.

• No External Power Required: Fully powered by I/O chassis backplane.

• Durable and Safe: Conformal coating and 1500V optoelectrical isolation protect the module.

• Easy Maintenance: Wiring arm allows module replacement without disturbing field wiring.

Applications

• Precise analog control for motor drives, valve actuators, and recorders.

• Industrial process automation requiring differential and isolated outputs.

• Integration with PLC 5 systems using block transfer for rapid data handling.

• Conversion of digital control signals to engineering units like °C, °F, or PSI.

FAQ

Q1: Is the 1771-OFE3 new and original?
Yes, the 1771-OFE3 is factory-new and original Allen-Bradley equipment.

Q2: How many outputs does this module provide?
It provides 4 isolated differential analog outputs with 1000V isolation each.

Q3: Does it require external power?
No, the module is powered directly from the PLC 5 chassis backplane.

Q4: What is the output current range?
Each output supports 0–50 mA current for precise analog control.

Q5: How is the module installed?
The 1771-OFE3 is rack-mountable and secured using keying bands and a wiring arm.