The Allen-Bradley 1771-AF1 is a standalone fiber optic converter module designed for the PLC-5 series. This module facilitates communication by converting electrical signals into fiber optic signals, enabling reliable data transmission over longer distances with reduced interference. As a standalone unit, the 1771-AF1 supports robust and noise-resistant connectivity, ideal for industrial environments requiring secure and high-integrity communication links. Although discontinued by the manufacturer, it remains useful for maintaining legacy PLC-5 systems utilizing fiber optic communications.