Product Overview

The SST-PB3-CLX Communication Module is an industrial communication interface designed to connect PROFIBUS DP networks with Allen-Bradley ControlLogix automation systems. It belongs to the SST communication product family associated with Woodhead and Molex. The module allows a ControlLogix controller to exchange data with compatible PROFIBUS DP devices, including remote I/O stations, motor drives, instrumentation, and other industrial automation equipment.

In many industrial facilities, automation equipment from different manufacturers must operate within the same control architecture. A PLC may manage the overall production process, while field devices communicate through a fieldbus network. A communication interface such as the SST-PB3-CLX provides a connection between these different control environments.

The SST-PB3-CLX is designed for installation in a compatible ControlLogix 1756 chassis. It uses the chassis backplane for communication with the controller and provides a PROFIBUS interface for connecting field devices. Depending on the configured operating mode, it can support PROFIBUS DP master and slave communication.

The module supports PROFIBUS DP communication speeds from 9.6 kbps to 12 Mbps. It also provides diagnostic indicators and configuration tools to assist engineers with network setup, monitoring, and troubleshooting.

The supplied product information identifies the dimensions as 120 × 90 × 45 mm and the weight as 0.209 kg. These values are useful for inventory management and shipping preparation, although the actual hardware and packaging should be checked before dispatch.

When purchasing this product, it is important to distinguish the basic SST-PB3-CLX designation from related catalog variants such as SST-PB3-CLX-RLL and SST-PB3-CLX-RLL-CC. These variants may have different ordering identifiers, firmware requirements, or configuration details. The complete model designation should be checked against the installed module.

Technical Specifications

Note: Detailed communication and memory specifications can vary by exact hardware and firmware variant. Confirm the complete ordering code and applicable product manual before engineering a replacement.

Function and Working Principle

The SST-PB3-CLX operates as a communication bridge between the ControlLogix backplane and a PROFIBUS DP field network. It allows the controller to exchange process data with devices connected to the PROFIBUS network.

1. PROFIBUS DP Network Communication

PROFIBUS DP is an industrial fieldbus protocol designed for communication between controllers and distributed field devices. It is commonly used with remote I/O systems, motor control equipment, sensors, actuators, and other automation devices.

The SST-PB3-CLX provides a PROFIBUS interface for connecting compatible equipment. Its supported communication speed ranges from 9.6 kbps to 12 Mbps, allowing network engineers to select a suitable communication rate according to the connected devices and network design.

2. Master and Slave Operation

The module supports PROFIBUS DP master and slave operating modes.

In master operation, the module manages communication with configured PROFIBUS slave devices. It exchanges input and output data with remote equipment according to the network configuration.

In slave operation, the module participates in a PROFIBUS network as a device controlled by another master. This allows data exchange between the ControlLogix platform and an external PROFIBUS control system.

The selected operating mode must match the network architecture. Engineers should also verify device addresses, GSD files, communication parameters, and the supported protocol version.

3. ControlLogix Backplane Data Exchange

The module is installed in a compatible ControlLogix 1756 chassis. Through the chassis backplane, it exchanges data with the ControlLogix controller.

This arrangement allows PROFIBUS process information to become available to the controller’s application logic. The PLC can then use the received data to make control decisions, operate machinery, or coordinate other automation equipment.

The module receives its operating power through the ControlLogix backplane. The documented current consumption is 850 mA at 5 V DC or 1.75 mA at 24 V DC.

4. Data Mapping

Data mapping defines how information from PROFIBUS devices is represented within the ControlLogix system.

The documented module specifications provide capacity for up to 1984 bytes of input data and 1968 bytes of output data. Actual usable data capacity depends on the configuration, device requirements, and application design.

Correct mapping is essential because PLC logic must interpret each data area according to the field device’s communication structure.

5. Diagnostics and Status Monitoring

The module includes status indicators for communication and system conditions. The documented indicators include COMM, SYS, and OK.

These indicators help maintenance personnel identify whether the module has initialized correctly and whether communication activity is present. They can also provide an initial indication of network or configuration problems.

For more detailed troubleshooting, engineers should use the appropriate configuration and diagnostic tools.

Role in Industrial Control Systems

The SST-PB3-CLX provides a communication connection between a ControlLogix controller and PROFIBUS DP equipment. It is particularly useful in systems where the main PLC platform and field devices use different communication technologies.

ControlLogix PLC Integration

The module works with the ControlLogix 1756 platform. It communicates with the controller through the chassis backplane and transfers configured process data between the PLC and the PROFIBUS network.

This allows existing ControlLogix applications to exchange information with compatible PROFIBUS devices without redesigning the entire automation architecture.

Remote I/O Integration

Industrial plants often distribute I/O equipment across different machines or production areas. PROFIBUS DP can connect remote I/O stations to a central control system.

The SST-PB3-CLX can provide the PROFIBUS connection required for this arrangement, allowing the PLC to receive field input signals and update output commands through the configured network.

Drive and Motor Control Integration

Variable frequency drives and motor-control devices may use PROFIBUS DP for exchanging operating commands and status information.

When compatible drives are connected to the network, the ControlLogix system can coordinate motor operation with other machine functions. Engineers must verify the drive’s communication interface, device configuration, and required data mapping.

SCADA and Supervisory Control

A SCADA system may collect information from PLCs and field devices for centralized monitoring and process supervision.

The SST-PB3-CLX supports field-level communication between ControlLogix and PROFIBUS devices. The broader SCADA connection is normally handled through the PLC’s communication architecture and other configured network interfaces.

Industrial Applications

The SST-PB3-CLX is suitable for industrial automation environments where ControlLogix systems need to communicate with PROFIBUS DP devices.

1. Manufacturing Automation

Manufacturing plants use PLCs to coordinate production machinery, conveyor systems, sensors, and distributed I/O stations.

The SST-PB3-CLX can connect compatible PROFIBUS equipment to a ControlLogix platform, allowing production data and control signals to be exchanged across different equipment groups.

2. Process Control Systems

Process facilities often contain instruments, actuators, and remote I/O devices distributed throughout the plant.

By connecting PROFIBUS devices to a ControlLogix system, the module can support the exchange of process measurements and control information. This can help centralize monitoring and improve coordination between field equipment and PLC logic.

3. Material Handling Systems

Conveyors, transfer equipment, sorting systems, and automated storage installations may use distributed motor controllers and remote I/O devices.

The SST-PB3-CLX can provide the communication interface needed to integrate compatible PROFIBUS devices into a ControlLogix-based control system.

4. Packaging and Production Lines

Packaging equipment often requires coordinated control of motors, sensors, pneumatic actuators, and distributed machine modules.

A PROFIBUS network can connect these devices to the main PLC system. The communication module allows the ControlLogix controller to exchange the required process information with compatible field equipment.

5. Power and Utility Systems

Industrial power and utility installations may use PLCs to monitor auxiliary machinery, pumps, ventilation systems, and distributed instrumentation.

Where PROFIBUS DP devices are already installed, the SST-PB3-CLX can support their integration with a ControlLogix control platform.

6. Equipment Modernization

Some industrial facilities retain existing PROFIBUS equipment while upgrading their main PLC or supervisory control architecture.

The SST-PB3-CLX may be considered as part of a ControlLogix integration solution, provided that the existing field devices, network configuration, and module firmware are compatible.

Installation and System Integration

Correct installation and configuration are essential for reliable communication between the ControlLogix controller and PROFIBUS field devices.

1. Verify the Module Model

Before installation, confirm the complete module designation. The SST-PB3-CLX is associated with several related product variants, including SST-PB3-CLX-RLL and SST-PB3-CLX-RLL-CC.

Do not assume that every variant has identical hardware, firmware, or configuration requirements. Check the product label and documentation for the exact module being installed.

2. Check ControlLogix Chassis Compatibility

The module is designed for a compatible ControlLogix 1756 chassis. Confirm that the chassis, power supply, controller, and available slot arrangement meet the installation requirements.

Also verify the available backplane power capacity. The module’s documented current consumption is 850 mA at 5 V DC or 1.75 mA at 24 V DC.

3. Install the PROFIBUS Network Connection

The documented PROFIBUS interface uses a 9-pin female D-sub connector.

Use an appropriate PROFIBUS cable and connector assembly. Pay attention to network topology, cable length, shielding, grounding, termination, and device addresses.

PROFIBUS termination should be correctly implemented at the physical ends of the bus. Incorrect termination or poor cable installation can lead to intermittent communication and network faults.

4. Configure the PROFIBUS Network

The module must be configured according to the connected field devices and the selected operating mode.

Typical configuration tasks include:

• Selecting the PROFIBUS master or slave operating mode.
• Setting the network communication speed.
• Assigning device addresses.
• Importing the required GSD device files.
• Defining input and output data mapping.
• Checking the firmware and software compatibility.
• Configuring diagnostic and status information.

The exact configuration procedure depends on the module variant and its supported engineering software.

5. Configure the ControlLogix Application

The ControlLogix project must include the appropriate module configuration and data structures. PLC logic should reference the correct input and output areas.

Before downloading a revised project, verify that the controller is in the appropriate operating mode and that the configuration matches the installed hardware and firmware.

6. Test Communication

After installation, check the module’s status indicators and confirm that the PROFIBUS network is operating correctly.

Test communication with each configured device. Verify that input data changes as expected and that output commands reach the intended equipment.

Record the final module configuration, firmware version, device addresses, and data mapping. This information can simplify future maintenance and replacement work.

Compatible System Components

The SST-PB3-CLX is designed to operate within a ControlLogix and PROFIBUS DP communication architecture.

These components are examples of equipment that may be used in a complete system. They are not necessarily supplied with the SST-PB3-CLX module.

Alternative Models and Replacement Considerations

When replacing an SST-PB3-CLX, engineers should first determine whether the original module is the standard version or a specific RLL or coated variant.

A replacement should be evaluated using the following criteria:

• Exact module catalog number and hardware revision.
• ControlLogix chassis compatibility.
• PROFIBUS DP master or slave operating requirements.
• DP-V0 and DP-V1 functionality.
• Communication speed and device count.
• Input and output data capacity.
• Firmware compatibility.
• Configuration software and licensing.
• PROFIBUS connector and network wiring.
• Backplane power consumption.

A module with a similar description may not be a direct replacement. Differences in firmware, data mapping, and engineering software can affect the operation of an existing PLC application.

Key Advantages

PROFIBUS DP Network Integration

The module provides a communication interface between ControlLogix systems and compatible PROFIBUS DP devices, supporting integration across different automation platforms.

Master and Slave Operating Modes

Support for PROFIBUS DP master and slave functions provides flexibility for different network architectures.

High-Speed Fieldbus Communication

Communication speeds from 9.6 kbps to 12 Mbps allow the network to be configured for the requirements of connected devices and application performance.

ControlLogix Backplane Integration

The module is designed for installation in a compatible 1756 chassis and exchanges data with the controller through the backplane.

Diagnostic Indicators

COMM, SYS, and OK indicators provide basic information about communication activity and module status, assisting maintenance personnel during troubleshooting.

Distributed Equipment Connectivity

The module supports communication with compatible remote I/O, drives, and other PROFIBUS field devices, helping reduce the need for separate communication architectures.

Application Flexibility

Its use in manufacturing, material handling, process control, and equipment modernization projects makes it relevant to industrial facilities that use both ControlLogix and PROFIBUS technologies.

Technical FAQs

1. What is the SST-PB3-CLX Communication Module?

The SST-PB3-CLX is a PROFIBUS DP communication module designed for integration with Allen-Bradley ControlLogix systems. It connects the ControlLogix platform with compatible PROFIBUS field devices.

2. Is the SST-PB3-CLX manufactured by Woodward?

The SST-PB3-CLX belongs to the SST / Woodhead communication product family associated with Molex. It should not be confused with Woodward engine or turbine control equipment.

3. Which PLC platform does the SST-PB3-CLX support?

It is designed for compatible Allen-Bradley ControlLogix 1756 chassis installations. Check the exact module variant and controller configuration before installation.

4. Which communication protocol does it support?

The module supports PROFIBUS DP communication, including documented DP-V0 and DP-V1 functionality.

5. What is the communication speed?

The supported communication speed ranges from 9.6 kbps to 12 Mbps. The actual speed must be configured according to the connected devices and network requirements.

6. Can it operate as both a PROFIBUS master and slave?

Yes. The product documentation identifies master and slave operating modes. The selected mode depends on the network architecture and the specific configuration.

7. How is the module powered?

The module receives its operating power through the ControlLogix backplane. Documented consumption is 850 mA at 5 V DC or 1.75 mA at 24 V DC.

8. What connector does it use?

The documented PROFIBUS interface uses a 9-pin female D-sub connector. Use a suitable PROFIBUS cable and connector assembly.

9. What do the status LEDs indicate?

The COMM, SYS, and OK indicators provide information about communication activity, system status, and module initialization. Refer to the applicable manual for the exact LED patterns and troubleshooting procedures.

10. What is the difference between SST-PB3-CLX and SST-PB3-CLX-RLL?

They are closely related product designations, but the complete ordering code matters. The RLL variant is documented as a ControlLogix PROFIBUS scanner configuration with associated firmware and engineering-tool requirements. Verify the exact catalog number before ordering or replacing a module.

11. Can the SST-PB3-CLX communicate with variable frequency drives?

Yes, it can communicate with compatible PROFIBUS DP drives when the drive has an appropriate PROFIBUS interface and is correctly configured. The required device profile and data mapping must be checked.

12. Is the SST-PB3-CLX suitable for replacement projects?

It may be suitable for maintaining existing ControlLogix and PROFIBUS installations. Before purchasing, confirm the module’s condition, exact variant, firmware, software compatibility, and network configuration.

Procurement and Maintenance Recommendations

When purchasing the SST-PB3-CLX, confirm the full product designation and manufacturer identification. The SST-PB3-CLX, SST-PB3-CLX-RLL, and SST-PB3-CLX-RLL-CC should not be treated as interchangeable without checking their technical documentation.

For new surplus, used, or refurbished units, request clear photographs of the product label, front panel, connector, and circuit-board condition where available. Confirm the hardware revision, firmware information, test status, and whether any required accessories or software licenses are included.

For international procurement, verify the physical dimensions and shipping weight separately. The supplied listing values are 120 × 90 × 45 mm and 0.209 kg, but packaging may change the final shipment measurements.

During maintenance, inspect the module seating, chassis connection, PROFIBUS connector, cable shielding, and network termination. Keep a record of the device addresses, configuration files, firmware version, and PLC data mapping.

If communication faults occur, check the physical network first, including cable continuity, connector wiring, termination, and grounding. Then review the module’s LED status, configuration parameters, device addresses, and firmware compatibility.

Conclusion

The SST-PB3-CLX Communication Module is an industrial PROFIBUS DP interface designed to connect compatible field devices with an Allen-Bradley ControlLogix automation system. It supports PROFIBUS DP master and slave operation, communication speeds from 9.6 kbps to 12 Mbps, and data exchange through a ControlLogix 1756 chassis backplane.

Its communication capabilities make it useful in manufacturing automation, distributed I/O systems, motor control, process facilities, and equipment modernization projects. For maintenance and replacement applications, verifying the complete product designation, firmware requirements, and ControlLogix compatibility is essential to ensuring reliable integration.