Get now the 20-750-PBUS, a robust communication adapter that enables Allen-Bradley PowerFlex 750-Series variable frequency drives to communicate over PROFIBUS DP industrial networks. This module is essential for integrating Rockwell Automation drives into multi-vendor environments or legacy European-standard automation systems.
What Is the 20-750-PBUS?
The 20-750-PBUS is a PROFIBUS DP (Decentralized Periphery) option module designed for PowerFlex 753 and 755 drives. It allows the drive to function as a slave node on a PROFIBUS network, providing a high-speed link for control commands and diagnostic data exchange. The PROFIBUS DP protocol is widely used in global automation, and the 20-750-PBUS allows for seamless interoperability with Siemens S7 PLCs and other non-Rockwell controllers. The module plugs into the drive’s internal communication slot and features a standard 9-pin D-sub connector. It supports PPO (Parameter Process Data Object) types, allowing users to define exactly which drive parameters are sent cyclically to the master controller for optimal network performance.
Key Technical Specifications
- Protocol: PROFIBUS DP-V1
- Connection: 9-Pin D-sub female connector
- Data Rates: 9.6 Kbps to 12 Mbps (Auto-detect)
- Network Address Range: 1 to 125
- Cyclic Data: PPO Types 1, 2, 3, 5
- Acyclic Data: DP-V1 Read/Write supported
- Module Slot: PowerFlex 750 internal slots (4-8)
- Isolation: 50V (continuous)
System Architecture and Integration
In a hybrid automation architecture, the 20-750-PBUS acts as a universal translator. It allows for the transmission of speed references, torque limits, and status words to the PROFIBUS master. The module supports DP-V1 functionality, which allows for acyclic communication. This means that while the drive is running, the master can perform complex tasks like reading internal drive logs or modifying acceleration ramps without disrupting the high-priority real-time control traffic. This dual-path communication is vital for advanced plant diagnostics and asset management in modern process industries.
Maintenance Tips
When installing the 20-750-PBUS, ensure that the PROFIBUS cable is properly shielded and that the shield is grounded at the drive connector. PROFIBUS is highly sensitive to signal reflections; verify that the termination switches on the D-sub connectors are set to «ON» only at the two physical ends of the network segment. If the drive is not communicating, check the node address setting in the drive parameters (Parameter 3, «Node Addr») to ensure it matches the configuration in the PROFIBUS master’s GSD file.
Frequently Asked Questions
Q: Where can I find the GSD file for the 20-750-PBUS?
A: The GSD file is available on the Rockwell Automation Product Compatibility and Download Center (PCDC) and is required to define the drive to your PROFIBUS master.
Q: Does this module support PROFIsafe?
A: No, the 20-750-PBUS is for standard control and diagnostics. For safety-rated communication, you would need specialized safety modules and a compatible network.
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