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- Allen Bradley
- 20-COMM-D
- PowerFlex DeviceNet Communication Adapter
- USA
- 86 x 19 x 78.5 mm
- 0.085 kg
- Xiamen, China
- New & In Stock
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- 1 Year
- 1-3 Working Days
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We provide 7*24 hours service to our customers. We will be there whenever you need us.
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All our products are priced very favorably because we have our own warehouse and supply.
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Product Overview
The Allen-Bradley 20-COMM-D is a DeviceNet communication adapter used with PowerFlex AC drives. It enables the drive to connect to a DeviceNet industrial network, allowing real-time communication with PLC systems for control, monitoring, and diagnostics.
It is commonly used in Rockwell Automation systems where legacy DeviceNet fieldbus networking is implemented for distributed motor control.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Model | 20-COMM-D |
| Product Type | DeviceNet Communication Adapter |
| Function | Drive network communication interface |
| Protocol | DeviceNet (CAN-based industrial network) |
| Installation | Internal drive-mounted module |
| Compatibility | PowerFlex 70 / 700 / 700H / 700S / 750 series |
| Communication Rate | Up to 500 kbps (DeviceNet standard) |
| Dimensions | 86 × 19 × 78.5 mm |
| Weight | 0.085 kg |
Function and Working Principle
The 20-COMM-D module acts as a protocol interface between the PowerFlex drive and a DeviceNet network. It works by:
- Converting internal drive communication (DPI) into DeviceNet protocol
- Allowing PLCs to read and write drive parameters in real time
- Supporting cyclic I/O communication and explicit messaging
- Enabling remote control of motor speed, start/stop, and diagnostics
Role in Industrial Systems
This adapter is widely used in industrial automation systems to enable:
- Centralized PLC control of multiple AC drives
- Real-time motor monitoring and feedback
- Integration into DeviceNet-based automation networks
- Coordinated operation of distributed drive systems
Industrial Applications
- Conveyor systems
- Packaging machinery
- Material handling systems
- Process automation plants
- Multi-motor industrial control systems
Installation Notes
- Installed inside the PowerFlex drive communication slot
- Requires correct DeviceNet node address configuration
- Uses 5-pin DeviceNet trunk/drop cabling
- Proper network termination resistors are required
- Must match firmware compatibility with host drive
Compatible Equipment
- Allen-Bradley PowerFlex 70 / 700 / 700H / 700S / 750 drives
- PLC systems with DeviceNet scanners (e.g., ControlLogix, CompactLogix)
- DeviceNet network infrastructure (trunk cables, taps, terminators)
Recommended Alternative Models
| Model | Type | Application |
|---|---|---|
| 20-COMM-E | EtherNet/IP adapter | Modern replacement (recommended upgrade) |
| 20-COMM-C | ControlNet adapter | Deterministic legacy networks |
| 20-COMM-R | Remote I/O adapter | Older Rockwell systems |
| PowerFlex 750 built-in Ethernet | Integrated comms | New generation drives |
Key Advantages
- Reliable industrial DeviceNet communication
- Strong compatibility with Rockwell PLC systems
- Supports multi-drive network architectures
- Stable real-time cyclic control
- Proven legacy industrial performance
Limitations
- Legacy fieldbus technology (DeviceNet is largely replaced by EtherNet/IP)
- Requires dedicated CAN-based wiring infrastructure
- Less flexible than modern Ethernet-based solutions
Conclusion
The Allen-Bradley 20-COMM-D DeviceNet Communication Adapter provides reliable network connectivity for PowerFlex drives in DeviceNet-based automation systems.
Although it is a legacy communication technology, it remains widely used in existing industrial installations for stable and deterministic drive control.