1771-OFE2 | Allen-Bradley PLC-5 Analog Output Module

Product Overview

The 1771-OFE2 is an analog output module developed for the Allen-Bradley PLC-5 control platform. It provides four individually isolated current output channels designed for precision analog signal generation in industrial automation systems. Operating in the 4–20 mA range, this module ensures stable and accurate current loop control for actuators, transducers, and process instrumentation. With 12-bit digital resolution and robust electrical isolation, it is well-suited for demanding environments where signal integrity is critical.

Key Features

• Brand: Allen-Bradley

• Model: 1771-OFE2

• Product Type: Analog Output Module

• Series: PLC-5 (1771 Product Bulletin)

• Number of Outputs: Four (4) isolated analog outputs

• Output Type: Individually isolated current output

• Output Current Range: 4–20 mA

• Digital Resolution: 12-bit binary

• Data Format: Natural Binary or BCD, scaling to ±9999

• Backplane Current: 1.5 A

• Power Dissipation: 7.9 W

• Thermal Dissipation: 26.9 BTU/hr

• External Power Requirement: None

• Isolation Voltage: 1000 V differential isolation between channels

• Mounting: Rack mountable (1771 I/O chassis)

• Module Width: Single slot

• Keying Positions: Between 10 and 12; between 26 and 28

• Field Wiring Arm: Cat. No. 1771-WC

• Alternative Wiring Arm: 1771-WH

• Wiring Screw Torque: 7–9 inch-pounds

• Indicators: 2 status LEDs for module and output monitoring

• Coating: Conformal coated for enhanced environmental protection

• Typical AC Signal Delay (Off): 45 ±15 ms

• Typical DC Signal Delay (Off): 50 ms

• Weight: 0.57 kg (1.25 lbs)

• Backplane Power: 1.50 A

• Mounting Location: 1771 I/O chassis slot

Application Scenarios

The 1771-OFE2 is ideal for process and motion control applications requiring high-accuracy analog outputs, including:

• Industrial process automation: Transmitting control signals to actuators and valves

• Motion control systems: Providing proportional current outputs to servo drives

• Energy and utilities: Controlling analog equipment in distributed control networks

• Legacy system maintenance: Supporting installed PLC-5 systems for continued operation

Compatibility

• System Compatibility: Designed for Allen-Bradley PLC-5 and 1771 I/O chassis systems

• Field Wiring: Compatible with 1771-WC or 1771-WH wiring arms

• Signal Output: Supports 4–20 mA loops for standard industrial analog control devices

FAQs

Q: Can the 1771-OFE2 output voltage signals?
A: No, this module supports only current outputs (4–20 mA).

Q: What kind of isolation does the 1771-OFE2 provide?
A: Each output channel is individually isolated to 1000 V, ensuring signal integrity and safety.

Q: Is an external power source required?
A: No, the module draws all required power from the PLC backplane.

Q: How precise is the output resolution?
A: The module provides a 12-bit digital resolution, delivering fine control over output signal accuracy.

Q: What wiring accessories are compatible?
A: The 1771-OFE2 supports field wiring arms Cat. No. 1771-WC and 1771-WH.