Description

Operational Overview

The Allen-Bradley SST-PFB-CLX functions as a high-speed communication bridge that integrates PROFIBUS DP connectivity directly into the Rockwell Automation ControlLogix platform. By acting as a master scanner, this module allows ControlLogix processors to control and exchange data with various PROFIBUS DP field devices, such as drives, sensors, and remote I/O stations. This interface effectively eliminates the need for complex gateways, thereby streamlining the architecture of hybrid automation environments that utilize both Rockwell and Siemens-standard hardware.

Key Technical Specifications

• Manufacturer: Allen-Bradley / Rockwell Automation
• Model Designation: SST-PFB-CLX
• Module Category: PROFIBUS DP Master/Scanner Interface
• Backplane Compatibility: ControlLogix 1756 Chassis
• Network Interface: 1 x RS-485 (PROFIBUS DP Port)
• Configuration Interface: 1 x RS-232 (Serial Config Port)
• Current Draw: 850mA @ 5V DC and 1.75mA @ 24V DC
• Dimensions: 3.5 x 14.6 x 13.8 cm
• Weight: 0.2 kg
• Protocol Support: PROFIBUS DP-V0 and DP-V1 functionality

Performance and Network Integration

The SST-PFB-CLX enhances system performance by managing all PROFIBUS network cyclic data transfers independently of the PLC scan time. This dedicated processing ensures that high-density I/O networks remain stable and responsive. Furthermore, the module supports extensive diagnostic features, which allow engineers to troubleshoot network health and individual slave device status directly from the ControlLogix programming environment. Because the module utilizes standard RS-485 physical layers, it maintains reliable data integrity even when operating in industrial settings with significant electromagnetic interference.

Application and Reliability

Industrial facilities frequently deploy the SST-PFB-CLX in process automation and complex manufacturing cells where multi-vendor interoperability is required. The module simplifies the expansion of existing systems, as it allows for the addition of DP remote racks without requiring a complete overhaul of the control logic. Additionally, the compact single-slot design preserves valuable chassis space, while the robust firmware provides long-term stability for critical infrastructure applications. By bridging the gap between distinct communication protocols, this scanner module provides a scalable and cost-effective solution for modern distributed control systems.