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

Related Models

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.