SST SST-PFB-CLX

Description

Product Brand and Model: SST SST-PFB-CLX

Product Description

The SST SST-PFB-CLX is a specialized Profibus DP Master Communication Module from SST (Solid State Technology), designed to integrate Rockwell Automation ControlLogix (CLX) and CompactLogix PLCs into Profibus DP networks. This module acts as a high-performance bridge, enabling these Allen-Bradley controllers to act as a Class 1 Master on a Profibus DP fieldbus. The primary function of the SST SST-PFB-CLX is to facilitate seamless data exchange between the Logix controller and a wide array of Profibus DP slaves, such as remote I/O stations, variable frequency drives (VFDs), motor starters, and sensors from manufacturers like Siemens, ABB, or any Profibus-compliant vendor. Its design focuses on providing a reliable, high-speed connection that leverages the native data table structure of the ControlLogix platform, making it a critical component for multi-vendor system integration in industrial automation.

Product Parameters

• Manufacturer/Brand: SST (Solid State Technology)
• Compatible Platform: Rockwell Automation ControlLogix, CompactLogix
• Module Type: Profibus DP Master Communication Interface
• Fieldbus Protocol: Profibus DP (Decentralized Peripherals) in accordance with EN 50170.
• Communication Role: Master (Class 1)
• Data Transfer Rate: Configurable from 9.6 kbit/s up to 12 Mbit/s, auto-baud detection.
• Number of Devices Supported: Up to 125 slaves (theoretical), practical limits depend on configuration and data throughput.
• Connection: Standard 9-pin D-sub female connector (following Profibus standard) for network connection.
• Backplane Interface: Communicates with the Logix CPU via the ControlLogix backplane (for rack-based models) or via an network adapter (for CompactLogix).
• Configuration Software: Configured using SST’s PBWork software, which is used to define the Profibus network, scanlist, and map slave data to/from the Logix controller’s data tables.
• Status Indicators: LEDs for module status, network activity, and diagnostics.

Advantages and Features

• Seamless Logix Integration: The key advantage of the SST SST-PFB-CLX is its ability to present Profibus slave data as simple arrays (INT, DINT) in the native ControlLogix data table. This allows programmers to access field device data using standard Logix instructions without needing to manage complex communication commands.
• High Performance and Flexibility: Offers high-speed data exchange and supports a wide range of Profibus DP slaves, making it an ideal solution for integrating specialized or legacy Profibus equipment into a modern Logix-based control system.
• Simplified Engineering: The PBWork configuration software provides a graphical environment for building the Profibus network scanlist and data mapping, which is more intuitive than raw configuration via GSD files for many engineers.
• Proven Reliability and Support: SST is a well-established provider of third-party communication interfaces for Allen-Bradley platforms, known for robust hardware and strong technical support.
• Cost-Effective Multi-Vendor Integration: Provides a more economical path to integrate Profibus devices compared to potentially more expensive or less flexible solutions from the primary PLC vendor.

Application Cases in Key Fields

• Automotive Manufacturing: Connects a ControlLogix controller managing a body-in-white line to Profibus-based welding controllers, robot controllers (e.g., KUKA, ABB), and tooling stations from European machine builders.
• Packaging and Printing Machinery: Integrates a Profibus-driven servo axis system, extruder, or printing press from a European OEM into the overall machine control managed by a CompactLogix PLC.
• Water and Wastewater Treatment: Allows a plant-wide ControlLogix SCADA controller to communicate with Profibus DP remote I/O panels and intelligent motor starters distributed across a large site.
• Pharmaceutical and Food & Beverage: Enables integration of Profibus-enabled process instruments (flow meters, weigh scales) and CIP (Clean-in-Place) skid controllers into the main batch automation system.

Comparisons with Competing Products

• Vs. Rockwell Automation 1756-PB72/A Series B Interface: This is Rockwell’s own Profibus DP master module. The SST SST-PFB-CLX often competes on price, ease of configuration (PBWork vs. Rockwell’s configuration), and sometimes on specific features or performance with certain slave devices. Rockwell’s module offers deeper integration within Studio 5000.
• Vs. ProSoft Technology PLX31-PBM Profibus Master Module: ProSoft is a direct competitor to SST in the third-party communication market. Both offer similar core functionality. The choice between the SST-PFB-CLX and a ProSoft module may come down to factors like specific customer experience, distributor relationships, or minor differences in the configuration software usability.
• Vs. Gateways (e.g., Profibus DP to EtherNet/IP): An alternative approach is to use a standalone gateway that converts Profibus DP to EtherNet/IP. The SST-PFB-CLX integrated module often provides lower latency, more deterministic performance, and a more direct data mapping into the controller’s memory compared to a network-based gateway.

Selection Suggestions and Precautions

• Selection Suggestions:
  1. Assess the Profibus Network: Document all Profibus slaves (device types, GSD files, data sizes). This is necessary for planning the scanlist and ensuring the SST-PFB-CLX can handle the total data throughput.
  2. Choose the Correct Form Factor: Ensure you select the model compatible with your specific Logix platform (e.g., ControlLogix rack module vs. CompactLogix form factor).
  3. Plan for Configuration Software: Budget for and ensure access to SST’s PBWork configuration software, which is essential for setting up the module.
• Precautions:
  1. GSD File Management: You will need the correct GSD (General Station Description) files for every Profibus slave device on the network. These must be imported into PBWork for proper configuration.
  2. Network Termination: A Profibus DP network must be properly terminated at both physical ends with the termination resistor switch enabled on the devices. Incorrect termination is a primary cause of communication errors.
  3. Data Mapping Strategy: Carefully plan how to map the Profibus slave data into the Logix data tables. Poor organization can lead to confusing and difficult-to-maintain code.
  4. Firmware Compatibility: Verify the firmware version of the SST SST-PFB-CLX module is compatible with your version of the Logix controller’s firmware and the PBWork software

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