Allen Bradley 1771-OFE3 PLC-5 Analog Output Module

Product Overview

The Allen Bradley 1771-OFE3 functions as a high-precision analog output interface for the legacy PLC-5® platform. This module provides four independent channels that convert digital words from the processor into proportional analog current signals to drive actuators, valves, and chart recorders. We supply this unit as 100% brand new and original, offering a critical solution for maintaining and extending the lifecycle of established 1771-chassis architectures.

Technical Specifications

The 1771-OFE3 utilizes a robust circuit design to handle heavy industrial loads:

Engineering Advantages

• Individual Channel Isolation: The 1771-OFE3 features complete electrical isolation between every output channel. This prevents ground loops and ensures that a single field-side fault or electrical surge does not propagate to adjacent channels or the central PLC backplane.

• High-Current Drive Capability: The 0–50 mA output range provides significantly more driving power than standard 4–20 mA modules. This allows the 1771-OFE3 to operate older hydraulic actuators and specialized industrial regulators that require higher current thresholds.

• Rugged 1771 Form Factor: The module utilizes the classic Allen Bradley "large-scale" I/O design, which excels in high-vibration and high-heat environments. Its mechanical structure ensures secure seating within the 1771 Universal I/O Chassis.

• Simplified Loop Maintenance: Individual isolation simplifies troubleshooting. Maintenance teams can disconnect or test a single loop without impacting the signal integrity or power stability of the remaining three outputs.

• Seamless Legacy Integration: This module requires no hardware adapters for existing PLC-5 systems. It slots directly into any available 1771 I/O rack, allowing for immediate replacement of failed components without requiring software logic rewrites.

FAQs

• What is the primary benefit of individual isolation in this module?

  Individual isolation protects the system against potential differences between field devices. It eliminates the need for external signal isolators, reducing total system cost and panel space.

• Does this 1771-OFE3 ship in its original box?

  Yes. Despite being a legacy component, we provide this unit as 100% brand new and factory-sealed. It includes all original manufacturer documentation and meets the highest E-E-A-T industrial standards for authenticity.

• Can I use the 1771-OFE3 to drive standard 4-20 mA devices?

  Yes. You can scale the 0–50 mA output range within the PLC-5 ladder logic to drive standard 4–20 mA or 0–20 mA field devices, provided the load impedance stays within the module’s specified limits.

• What are the power requirements for the backplane?

  The module draws 2.5 Amps from the 5V DC backplane. Engineers must verify that the 1771 chassis power supply has sufficient headroom to support this load alongside other installed I/O modules.