SST SST-PFB-CLX Top-level Profibus communication module

SST-PFB-CLX (part of the Molex/SST Brad® communications line) is a premier Profibus communication module specifically designed for the Allen-Bradley ControlLogix platform.

This module allows a ControlLogix PLC to act as a Profibus DP Master or Slave, providing a seamless high-speed link between Rockwell Automation environments and Profibus-based field devices like drives, sensors, and remote I/O.

By using an onboard processor, the SST-PFB-CLX manages the entire Profibus protocol stack independently, ensuring that the ControlLogix CPU remains dedicated to logic execution without being burdened by network overhead.

Technical Parameter Table

The SST-PFB-CLX is part of a specialized family of "In-Rack" modules for Rockwell platforms:

SST-PB3-CLX-RLL: The next-generation "PB3" module with enhanced memory.

SST-PFB-PLC5: Profibus interface for the legacy Allen-Bradley PLC-5 system.

SST-PFB-SLC: Profibus interface for the SLC 500 series.

SST-DN3-CLX: DeviceNet equivalent for the ControlLogix chassis.

Application Cases

Hybrid Systems: Integrating Siemens-based drives or motor starters into a Rockwell-controlled assembly line.

Plant Expansion: Adding Profibus-enabled instrumentation (common in water treatment or oil and gas) to an existing ControlLogix network.

Migration Projects: Replacing old Profibus masters with modern Allen-Bradley PLCs while keeping existing field wiring and I/O intact.

Packaging Lines: High-speed synchronization of Profibus-based servo drives within a ControlLogix motion profile.

Product Advantages and Features

Simplified Integration: Uses Add-On Profiles (AOP) and Add-On Instructions (AOI) in Studio 5000. making the Profibus data look like native Logix tags.

Dual Functionality: Capable of running as a Master and a Slave simultaneously, allowing it to bridge two different networks.

Auto-Configuration: Features a "Scan" mode that automatically detects all active Profibus slaves on the wire, drastically reducing commissioning time.

High Performance: Onboard RISC processor ensures sub-millisecond data updates, even with a maximum load of 125 slaves.

Diagnostic Tools: Includes the SST Profibus Console software for advanced network health monitoring and packet capture.

Installation and Maintenance

Installation

Hardware: Insert the module into any available slot in a 1756 ControlLogix chassis. It is hot-swappable, though a cold-insert is recommended for initial setup.

Configuration: Connect a PC to the front-panel port and use the SST Profibus Configuration Tool to define the GSD files and network parameters.

Logix Setup: Import the Add-On Profile into RSLogix 5000/Studio 5000 and map the I/O data to controller tags.

Maintenance

LED Status: Monitor the "COMM" and "SYS" LEDs. Solid green on both indicates a healthy network and internal hardware.

GSD Files: Keep a library of the .GSD files for all connected field devices; these are required if a slave needs to be replaced or reconfigured.

Firmware: The module supports field-flashable firmware updates via the configuration software to ensure compatibility with the latest Logix versions.

Unique Product Description

The SST-PFB-CLX is the "Universal Translator" for the modern industrial floor.

In an industry often divided between Rockwell and Siemens standards, this module provides a high-reliability bridge that removes the "language barrier."

Its ability to handle DP-V1 acyclic messaging makes it particularly powerful for process industries,

allowing users to not only read I/O but also perform remote calibration and asset management of complex sensors directly from the ControlLogix environment.