Procure now the 20-COMM-D, a robust DeviceNet communication interface designed for integrating PowerFlex drives into industrial fieldbus networks.
What Is the 20-COMM-D?
The 20-COMM-D is a communication adapter that provides a direct link between Allen-Bradley PowerFlex 7-Class AC drives and a DeviceNet network. DeviceNet is a cost-effective, high-reliability fieldbus based on CAN technology, widely used for connecting simple industrial devices like sensors and motor starters to higher-level controllers. By utilizing the 20-COMM-D, maintenance teams can monitor drive health, adjust parameters in real-time, and execute control commands without hard-wiring I/O. This adapter plugs into the drive’s DPI (Drive Peripheral Interface) port and is an essential component for brownfield modernizations and existing DeviceNet infrastructures where PowerFlex drives are the primary motion units.
Key Technical Specifications
- Network Protocol: DeviceNet (CAN-based)
- Data Rates: 125 Kbps, 250 Kbps, 500 Kbps
- Connections: 5-pin open-style linear plug
- DPI Support: Supports drive and peripheral configurations
- Configuration: Via Node Address switches or software
- Diagnostics: Integrated status LEDs for Network and Module health
Fieldbus Architecture and Data Mapping
The 20-COMM-D supports both Explicit Messaging for parameter configuration and Implicit Messaging for real-time I/O control. This allows for flexible data mapping within the DeviceNet scanner’s memory. It is fully compatible with RSNetWorx for DeviceNet, which provides a graphical environment for network management. The module’s compact design allows it to be housed entirely within the drive’s enclosure, maintaining the unit’s IP rating while providing critical connectivity to the factory floor network.
Maintenance Tips
A common issue with DeviceNet networks is voltage drop; ensure that the 24V DC power on the DeviceNet trunk is stable at the 20-COMM-D connection point. Use a voltmeter to verify that the power is between 11V and 25V DC. If the module shows a «Bus-Off» fault, check for loose wires on the 5-pin connector or verify that the network has exactly two 121-ohm terminating resistors (one at each physical end of the trunk). Periodically check the «Net» LED; a flashing green state indicates the drive is on the network but not currently allocated by a scanner.
Frequently Asked Questions
Q: How do I set the node address on the 20-COMM-D?
A: The node address (0-63) can be set manually using the rotary switches on the module or through software if the switches are set to 99.
Q: Is the 20-COMM-D compatible with PowerFlex 4-Series drives?
A: No, PowerFlex 4-Series drives use a different internal architecture. This module is specific to drives with a DPI port, such as the PowerFlex 70 and 700.
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