Allen-Bradley 1771-AF Fiber-Optic Converter Module

Configured for high-speed signal conversion in PLC-5 industrial networks, the Allen-Bradley 1771-AF (1771-AF Fiber-Optic Converter Module) provides direct physical/electrical execution. This component maps serial data streams between localized I/O chassis and fiber-optic media, facilitating deterministic communication at selectable bit rates of 57,600 bit/s or 115,200 bit/s.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks

The 1771-AF module ensures integration of serialized data into the broader Allen-Bradley control ecosystem. While primarily functioning as a media converter, the module requires strict adherence to backplane bus communication velocity parameters to ensure data integrity during packet transfer. Users must verify firmware flash compatibility and configuration settings when integrating this module into existing PLC-5 architectures, as deviations in bus timing can result in transmission errors or packet collisions on the I/O backplane.

Frequently Asked Questions

Q: What is the significance of the connector keying settings?

A: The upper (54-56) and lower (16-18) connector keying settings are physical mechanical configurations used to ensure that the 1771-AF module is inserted only into the intended chassis slot position. This prevents inadvertent insertion into mismatched signal or power distribution slots.

Q: Can this module be used in chassis configurations other than the 1771 I/O system?

A: No. The 1771-AF is hardware-keyed and electrically designed exclusively for the Allen-Bradley 1771 I/O chassis backplane interface.

Field Installation Guidelines

• Chassis Slot Assignment: Ensure the module is seated in an active 1771 I/O chassis slot. Confirm that the mechanical keys on the backplane correspond to the 54-56 (upper) and 16-18 (lower) keying profiles of the module.
• Cabling: Utilize only Coaxial Quad-Shield RG-6 cable for connections to ensure adherence to specified attenuation and impedance standards. Minimize cable bending radius to prevent signal degradation and maintain optimal throughput.
• Thermal Management: The module dissipates 5 W during operation. Ensure the I/O chassis is installed in an environment with sufficient convective airflow to maintain the internal ambient temperature within the rated operational limits.
• Grounding: Ensure the chassis backplane has a solid connection to the equipment grounding bus to prevent ground potential differences from affecting the high-speed data signals processed by the converter.