Allen-Bradley 20-750-PBUS – PROFIBUS DP Communication Option Module | PowerFlex 750 Series
Engineering Background
The 20-750-PBUS is a factory-engineered PROFIBUS DP communication option module designed exclusively for the Allen-Bradley PowerFlex 750 Series AC drives. Developed by Rockwell Automation, this module enables deterministic, high-speed fieldbus communication between PowerFlex 750 drives and PROFIBUS DP master controllers — including Siemens SIMATIC S7 PLCs, DCS systems, and third-party automation platforms. It is the OEM-specified solution for integrating PowerFlex 750 drives into PROFIBUS DP networks operating at up to 12 Mbps.
Product Positioning
Targeted at procurement engineers and system integrators managing industrial automation infrastructure, the 20-750-PBUS eliminates the need for external gateways or protocol converters. It slots directly into the PowerFlex 750 option bay, providing native drive parameter access, real-time speed/torque control, and diagnostic transparency — all over a single PROFIBUS DP cable. Konmask.com supplies this module as a verified, traceable component with full documentation support.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 20-750-PBUS |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Series | PowerFlex 750 Option Module |
| Communication Protocol | PROFIBUS DP (EN 50170 / IEC 61158) |
| PROFIBUS Data Rate | 9.6 kbps – 12 Mbps (auto-detect) |
| PROFIBUS Address Range | 0 – 125 (software configurable) |
| Cyclic I/O Data | Up to 32 words input / 32 words output |
| Acyclic Messaging | Supported via DPV1 Class 1 & Class 2 |
| GSD File | Provided (Rockwell Automation official) |
| Compatible Drives | PowerFlex 753, PowerFlex 755, PowerFlex 755T |
| Option Bay Slot | Port 4, 5, or 6 (peripheral option bay) |
| Connector Type | DB9 Female (PROFIBUS standard) |
| Operating Temperature | 0°C to +50°C (32°F to 122°F) |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5% – 95% non-condensing |
| Power Consumption | Supplied via drive option bay (no external power required) |
| Enclosure Rating | IP20 (module only) |
| Certifications | CE, UL, cUL, RoHS |
| Firmware Compatibility | PowerFlex 750 firmware v1.x and above |
| Weight | 0.5 kg |
| Country of Origin | United States |
Proven Application Environments
- Automotive Manufacturing: Conveyor and transfer line speed control integrated into Siemens SIMATIC S7-300/400/1500 PROFIBUS networks
- Water & Wastewater: Pump station VFD control with remote parameter monitoring via PROFIBUS DP master SCADA systems
- Oil & Gas: Compressor and fan drive integration in DCS-controlled process plants requiring deterministic fieldbus response
- Mining & Minerals: Crusher and conveyor drives networked via PROFIBUS DP for centralized PLC supervision
- Food & Beverage: Hygienic process lines where PROFIBUS DP provides reliable, noise-immune communication in high-EMI environments
- HVAC & Building Automation: Large-scale air handling unit VFD control integrated into building management systems via PROFIBUS
Engineering Advantages
- Native Integration: Plug-in option bay design — no external gateway, no additional wiring, no protocol overhead
- Auto Baud Rate Detection: Automatically synchronizes to network baud rate from 9.6 kbps to 12 Mbps without manual configuration
- DPV1 Acyclic Messaging: Enables full drive parameter read/write access from the PROFIBUS master without interrupting cyclic I/O
- Dual-Port Redundancy Ready: Compatible with PowerFlex 755 dual-port configurations for high-availability architectures
- Diagnostic Transparency: Drive fault codes and status words mapped directly to PROFIBUS DP diagnostic data for rapid fault isolation
- Rockwell Studio 5000 / DriveExecutive Compatible: Full parameter visibility retained via drive programming tools alongside PROFIBUS operation
- Compact Form Factor: Minimal footprint within the drive enclosure — no panel space penalty
System Architecture & Signal Flow
The 20-750-PBUS installs into the peripheral option bay (Port 4/5/6) of a PowerFlex 750 Series drive. Upon power-up, the module performs automatic baud rate detection and acquires its PROFIBUS node address from the onboard DIP switch or software parameter. The PROFIBUS DP master (PLC/DCS) exchanges cyclic I/O data — speed reference, torque reference, control word, status word — with the drive at each network scan cycle. Acyclic DPV1 services allow the master to read or write any drive parameter (e.g., acceleration ramp, current limit, fault history) on demand without disrupting real-time control. Drive diagnostic data is automatically mapped to PROFIBUS DP standard diagnostic bytes, enabling the master to detect and log drive faults without additional programming.
Signal Flow: PROFIBUS DP Master → DB9 Connector → 20-750-PBUS Module → PowerFlex 750 Internal Backplane → Drive Control Board → Motor Output
Sourcing & Quality Verification
- All units supplied by Konmask.com are sourced from authorized distribution channels or verified surplus with full traceability
- Each module undergoes visual inspection, label verification (catalog number, date code, revision level), and functional pre-shipment checks
- Original Rockwell Automation packaging and documentation preserved where available
- Certificate of conformance available upon request for regulated industries
- Anti-counterfeit verification: holographic Rockwell Automation labels and catalog number cross-referenced against Rockwell’s published product database
Procurement Process
- Confirm Compatibility: Verify your PowerFlex 750 drive model (753 / 755 / 755T) and available option bay slot (Port 4, 5, or 6)
- Request Quote: Contact support@konmask.com with quantity, required delivery date, and destination country
- Order Confirmation: Purchase order accepted; lead time and shipping method confirmed within 24 hours
- Shipment & Documentation: Module ships with packing list, commercial invoice, and optional certificate of conformance
- Technical Support: Post-delivery commissioning support available via email or phone
Technical FAQ
Q: Is the 20-750-PBUS compatible with PowerFlex 753 and PowerFlex 755T?
A: Yes. The module is compatible with all PowerFlex 750 Series drives including the 753, 755, and 755T variants, provided an available peripheral option bay slot exists.
Q: Can I use multiple 20-750-PBUS modules in a single drive?
A: No. Only one PROFIBUS DP option module is supported per drive. However, the PowerFlex 755 supports multiple option modules of different types simultaneously across its available ports.
Q: Does the module support PROFIBUS PA?
A: No. The 20-750-PBUS supports PROFIBUS DP only. PROFIBUS PA requires a separate DP/PA coupler and is not natively supported by this module.
Q: Where can I download the GSD file?
A: The official GSD file is available from the Rockwell Automation Product Compatibility and Download Center (PCDC). Konmask.com can also provide the GSD file upon request.
Q: What is the maximum cable length for PROFIBUS DP at 12 Mbps?
A: At 12 Mbps, the maximum PROFIBUS DP segment length is 100 meters per the EN 50170 standard. Repeaters can extend total network length.
Q: Is firmware update required after installation?
A: The module firmware is embedded and does not require field updates. Drive firmware v1.x or above is required for full compatibility.
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