Allen Bradley 1771-AF PLC-5 Fiber Optic Converter

Product Overview

The Allen-Bradley 1771-AF is a fiber-optic converter module for PLC-5 systems. It converts the electrical Remote I/O or Data Highway Plus signals to fiber-optic transmission, extending network reach and providing immunity to electrical noise in harsh industrial environments.

Technical Specs

• Product type: Fiber-optic converter module
• Platform: PLC-5 / 1771 I/O chassis
• Function: Electrical-to-fiber optic signal conversion
• Networks: Remote I/O, Data Highway Plus (DH+)
• Mounting: 1771 I/O chassis slot

Key Features

• Extends communication distance beyond copper cable limits
• Complete electrical isolation from ground loops and EMI
• Supports daisy-chain or star fiber topologies
• Direct chassis mounting without external power

FAQ

• What is the difference between 1771-AF and 1771-AF1? The AF1 is the stand-alone version; the AF mounts in a 1771 chassis slot.
• Which fiber cable is used? Standard 62.5/125 micron multimode fiber with ST connectors.
• Does it require configuration? No, it operates transparently as a media converter.

Installation Guide

1. Install the module in any available 1771 chassis slot except the leftmost.
2. Connect the copper RIO or DH+ cable to the module's electrical port.
3. Connect the fiber-optic cable to the ST port.
4. Verify link indicators on both ends of the fiber link.
5. Test communication integrity across the converted link.

Selection Tips

• Use 1771-AF pairs for long-distance RIO drops in electrically noisy plants.
• Select the 1771-AF1 stand-alone unit for panel-mount applications without a 1771 chassis.
• Confirm fiber type and connector style match existing plant infrastructure.