Allen Bradley 1771-OFE3 4-Channel Analog Output Module

Product Overview

The Allen-Bradley 1771-OFE3 is a 4-channel analog output module for the PLC-5 platform. It delivers 0-50 mA current outputs with 12-bit resolution, providing precise analog control of actuators, valves, and drives in process applications.

Technical Specs

• Output channels: 4 current outputs
• Output range: 0-50 mA
• Resolution: 12 bits
• Data format: Natural binary or BCD scaling to ±9999
• Backplane current: 1.0 A max
• Wiring arm: 1771-WC
• External power: None required

Key Features

• 0-50 mA output range covers legacy process instrumentation
• 12-bit resolution provides precise analog control
• Block-transfer programming for flexible data scaling
• Direct backplane interface with PLC-5 processors

FAQ

• What is the output range of the OFE3? 0-50 mA per channel, fixed range.
• How does it differ from the OFE2? The OFE2 provides 4-20 mA outputs; the OFE3 provides 0-50 mA outputs.
• Which software programs it? RSLogix 5 with block-transfer read/write instructions.

Installation Guide

1. Power down the chassis.
2. Insert the module into any slot except the leftmost.
3. Attach the 1771-WC wiring arm and connect analog output wiring.
4. Configure the module using block-transfer write instructions in RSLogix 5.
5. Calibrate outputs against a reference meter and verify scaling.

Selection Tips

• Select 1771-OFE3 for 0-50 mA legacy instrumentation; choose 1771-OFE2 for standard 4-20 mA loops.
• For voltage outputs, use the 1771-OFE1 (±10 V).
• Verify chassis power budget: 1.0 A backplane current per module.