1771-AF Allen-Bradley Fiber-Optic Converter Module

Description

1771-AF Allen-Bradley Fiber-Optic Converter Module

Product Dimensions：

Product Description

The Allen-Bradley 1771-AF is a Fiber-Optic Converter Module for the legacy PLC-5 and SLC 500 family of programmable logic controllers. Its primary purpose is to convert the electrical signals of a remote I/O (RIO) network into optical signals, allowing for reliable communication over long distances and in environments with high electrical noise.

Product Specifications

• Part Number: 1771-AF (Fiber-Optic Converter Module)
• Manufacturer: Allen-Bradley (Rockwell Automation)
• Compatibility: Designed for use with Allen-Bradley PLC-5 and SLC 500 controllers in a 1771 I/O chassis.
• Function: Converts the electrical RIO network signal (from a 1771-ASB adapter module) into a fiber-optic signal and vice versa.
• Current Load: It draws approximately 1.0 Amperes from the 5V backplane of the chassis.
• Thermal Dissipation: 17.06 BTU/hr.
• Dimensions: Approximately 3.5 x 6.5 x 2.0 inches (89 x 165 x 51 mm).
• Communication Rate: Supports high-speed communication at 57,600 and 115,200 bits per second.

Product Advantages

• Immunity to Electrical Noise: Fiber-optic cables transmit light pulses instead of electrical signals. This makes the 1771-AF module and its fiber-optic connections completely immune to electromagnetic interference (EMI) and radio-frequency interference (RFI), which are common problems in industrial environments. This ensures reliable communication in electrically noisy areas like near motors, welders, and power cables.
• Long-Distance Communication: Fiber-optic communication allows you to extend the distance between the controller and remote I/O chassis far beyond the limits of standard copper cables. This is crucial for large-scale facilities or distributed control systems.
• Electrical Isolation: Fiber-optic cables provide electrical isolation, which eliminates problems caused by ground loops and differing ground potentials between distant chassis.
• Enhanced Safety: The module and its fiber-optic connections are intrinsically safe in hazardous or explosive environments because they do not carry electrical signals that could cause a spark.

Precautions

• System Compatibility: The 1771-AF module is an older product designed specifically for the legacy PLC-5 and SLC 500 platforms. It is not compatible with modern control systems like ControlLogix or CompactLogix.
• Proper Fiber-Optic Cable Handling: Fiber-optic cables are sensitive. You should never look directly into the end of an active fiber-optic cable, as the light can be harmful to your eyes.
• Electrostatic Discharge (ESD): Like all electronic components, the module is sensitive to ESD. Always follow proper handling procedures, such as wearing a grounded wrist strap, when installing or removing the module.
• Correct Wiring and Grounding: When using the 1771-AF with a 1771-AS module, ensure the drain wire is connected to a ground at only one end of the cable to prevent ground loop issues.

Product Applications

The 1771-AF module is used in applications where reliable communication is needed over long distances or in harsh electrical environments.

• Large-Scale Facilities: Connecting a central PLC-5 controller to remote I/O racks located in different buildings or distant parts of a factory.
• Heavy Industrial Environments: Applications in steel mills, foundries, or chemical plants where powerful machinery and electrical noise would compromise standard copper-based communication.
• Hazardous Locations: Providing safe and reliable communication in areas where explosive gases or dust may be present.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

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