SST (Molex / Woodhead) SST-PFB-CLX

Product Details

SST-PFB-CLX Product Description

The SST SST-PFB-CLX is a high-performance Profibus DP scanner module engineered for Allen-Bradley ControlLogix PLC platforms. Designed to bridge the gap between legacy field devices and modern industrial Ethernet architectures, the SST-PFB-CLX enables seamless data exchange across the full automation data chain — from field-level sensors and actuators through PLC controllers, SCADA systems, and enterprise MES layers. In smart factory environments where real-time visibility and deterministic communication are non-negotiable, the SST-PFB-CLX delivers the protocol translation, network stability, and diagnostic transparency that system integrators demand.

In a fully connected smart factory, the SST-PFB-CLX occupies a critical position in the industrial data chain. At the field level, Profibus DP slaves — including distributed I/O racks, variable frequency drives, pneumatic valve terminals, and intelligent sensors — continuously generate process data. The SST-PFB-CLX, installed in the Allen-Bradley ControlLogix 1756 backplane alongside modules such as the 1756-EN2T EtherNet/IP communication module, acts as the Profibus DP master, cyclically polling all connected slaves and mapping their I/O data directly into the ControlLogix controller tags.

From the ControlLogix CPU — for example a 1756-L73 or 1756-L85E — the aggregated field data flows upstream via EtherNet/IP to SCADA platforms such as Rockwell FactoryTalk View SE or Wonderware System Platform. Operators gain real-time visibility into every Profibus node: motor speed feedback from Siemens SINAMICS G120 drives, valve position status from Festo CPX-FB33 valve terminals, and temperature readings from field transmitters — all consolidated into a single, unified data namespace. The SST-PFB-CLX's acyclic DP-V1 messaging capability further enables on-demand parameter reads and writes to intelligent slaves without interrupting the cyclic scan cycle, supporting predictive maintenance workflows and remote parameter adjustment from the SCADA layer.

For edge computing and IIoT integration, the ControlLogix system can publish tag data to edge gateways such as the Kepware KEPServerEX OPC-UA server or Moxa industrial edge computers, enabling data forwarding to cloud analytics platforms and digital twin environments. The SST-PFB-CLX's deterministic Profibus DP communication ensures that latency-sensitive process data — such as servo position feedback or safety relay status — arrives at the controller within the required scan cycle, maintaining the data integrity that upstream analytics depend on.

In multi-network architectures, the SST-PFB-CLX coexists in the same ControlLogix chassis with DeviceNet scanner modules (such as the SST-DN3-CLX) and EtherNet/IP adapter modules, allowing a single ControlLogix controller to simultaneously manage Profibus DP, DeviceNet, and EtherNet/IP field networks. This multi-protocol chassis design eliminates the need for separate gateway hardware, reduces panel footprint, and simplifies the unified control program. Remote I/O expansion via FLEX I/O 1794 adapters on the Profibus DP network further extends the reach of the ControlLogix system to distributed field cabinets across large plant floors.

Many industrial sites face persistent data gaps: legacy Profibus DP field devices cannot communicate natively with modern EtherNet/IP-based control systems, creating protocol islands that block real-time monitoring and remote diagnostics. The SST-PFB-CLX directly resolves this by acting as the authoritative Profibus DP master within the ControlLogix backplane, eliminating the need for external protocol converters or standalone gateways that introduce additional failure points and maintenance overhead.

Data silos are further addressed through the SST-PFB-CLX's full DP-V1 acyclic channel support, which allows SCADA and MES systems to read device-level diagnostics — fault codes, communication error counters, slave configuration mismatches — directly from Profibus slaves without halting production. This transparency enables alarm tracking at the device level: when a Profibus slave drops off the network, the SST-PFB-CLX immediately flags the fault in the ControlLogix diagnostic buffer, triggering SCADA alarm notifications and enabling maintenance teams to pinpoint the failed node remotely before dispatching field personnel.

For production line transparency, the SST-PFB-CLX supports GSD file-based slave configuration, ensuring that every Profibus device — regardless of manufacturer — is correctly parameterized and its I/O data accurately mapped. System expansion is straightforward: additional Profibus DP slaves can be added to the network up to the 125-node limit without modifying the ControlLogix control program structure, supporting phased capacity increases as production lines scale. All units are shipped after full functional testing, backed by a 12-month warranty and supported by in-stock inventory for rapid project deployment.

Q1: What is the maximum Profibus DP baud rate supported by the SST-PFB-CLX, and does cable length affect it? The SST-PFB-CLX supports Profibus DP baud rates from 9.6 kbps up to 12 Mbps. Maximum cable segment length is inversely related to baud rate — at 12 Mbps the maximum segment length is 100 m, while at 187.5 kbps it extends to 1,000 m per segment. Repeaters can be used to extend total network reach beyond a single segment.

Q2: Is the SST-PFB-CLX compatible with all ControlLogix chassis and firmware versions? The SST-PFB-CLX is designed for the Allen-Bradley ControlLogix 1756 backplane and is compatible with standard ControlLogix chassis sizes (4, 7, 10, 13, 17 slots). Firmware compatibility should be verified against the SST configuration software release notes; the module is broadly supported across ControlLogix firmware generations used in active production environments.

Q3: Can the SST-PFB-CLX support remote diagnostics and slave fault detection without stopping the Profibus DP scan? Yes. The SST-PFB-CLX uses DP-V1 acyclic messaging to read slave diagnostic data independently of the cyclic I/O scan. Slave fault information — including communication errors, parameterization faults, and watchdog timeouts — is mapped into ControlLogix controller tags and can be forwarded to SCADA alarm systems in real time, enabling remote diagnostics without any interruption to the live Profibus DP network.

Q4: What warranty and pre-shipment testing does the SST-PFB-CLX include? Every SST-PFB-CLX unit is functionally tested prior to shipment to verify Profibus DP communication, backplane interface integrity, and configuration software connectivity. The module is covered by a 12-month warranty from the date of shipment. In-stock units are available for immediate dispatch to support urgent project timelines and minimize procurement lead times.