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Allen-Bradley 20-COMM-C PowerFlex ControlNet Adapter
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- Part Number: 20-COMM-C
- Brand: Allen-Bradley
- Type: Communication Modules
- Barcode: USA
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Product Description
The Allen-Bradley 20-COMM-C, also cataloged as the 20-COMM PowerFlex ControlNet Adapter, operates as a dedicated hardware component for protocol communication and network interfacing within PowerFlex drive platforms. Designed for internal mounting or installation via a DPI external communications kit, the module bridges drive parameter data to ControlNet networks operating at a fixed data rate of 5 Mbps. Data transfer execution supports up to 20 simultaneous CIP messaging connections and up to 400 total I/O packets per second (200 in and 200 out) powered by a 275 mA current draw at 5 VDC from the host drive.
Suffix Breakdown & Model Matrix
| Suffix / Feature Code | Technical Specification / Configuration |
|---|---|
| 20-COMM | PowerFlex DPI Internal Communication Option Series |
| C | ControlNet Protocol Network Interface Option |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 20-COMM-C |
| Brand | Allen-Bradley |
| Origin | USA / Global Manufacturing |
| Weight | 0.5 kg (1.10 lbs) |
| Dimensions | 103 x 80 x 16 mm (4.06 x 3.15 x 0.63 inches) |
| Operating Temp | -10 to 50 deg C (14 to 122 deg F) |
| Power Consumption | 275 mA at 5 VDC (1.375 W supplied by host drive/DPI kit) |
| Network Protocol | ControlNet |
| Data Rate | 5 Mbps (fixed) |
| Packet Throughput | Up to 400 total I/O packets/sec (200 in / 200 out) |
| Connection Capacity | 20 simultaneous CIP connections; 1 exclusive-owner, up to 3 redundant-owner, or 1 listen-only I/O connection |
| Humidity | 5 to 95% non-condensing |
Deterministic Network Velocity & Backplane Bus Integration
The Allen-Bradley 20-COMM-C maintains deterministic signal synchronization across host PowerFlex drive backplanes, ensuring stable backplane bus communication velocity during intensive parameter transfers. Internal processing logic provides firmware flash compatibility for real-time controller updates and cyclic I/O assembly routing. Network frame processing logic isolates drive control execution loops from transient bus traffic, enabling steady state motor regulation across high-density PLC topologies.
Frequently Asked Questions
Q: How is primary operating power delivered to the communication adapter board?
A: Power is drawn directly from the host PowerFlex drive or the DPI external communications kit via the DPI ribbon cable interface, consuming 275 mA at 5 VDC.
Q: What are the limits on concurrent I/O connections supported over the ControlNet network?
A: The adapter supports 20 simultaneous CIP messaging connections, unlimited input-only I/O connections, and either 1 exclusive-owner I/O connection, up to 3 redundant-owner I/O connections, or 1 listen-only I/O connection.
Field Installation Guidelines
Ensure input power to the host PowerFlex drive is disconnected and line capacitors are fully discharged prior to opening the chassis cover. Install the 20-COMM-C module firmly into the drive's designated DPI internal option slot or DPI external communications kit, verifying full pin engagement of the multi-pin connector. Align coaxial RG-6 ControlNet BNC cables through panel wireways away from high-voltage AC motor conductors to mitigate electromagnetic interference. Ground the host drive frame to the central enclosure grounding bus to prevent ground potential variations from affecting communication signal integrity.
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