The Allen-Bradley 20-COMM-C is a ControlNet communication adapter module designed for PowerFlex 7-Class drives and other compatible Rockwell Automation motor control devices. It enables high-speed, deterministic communication between AC drives and PLC systems over a ControlNet network, allowing precise real-time control, monitoring, and data exchange in industrial automation systems.
This module is widely used in manufacturing environments where synchronized motor control, stable network performance, and reliable deterministic communication are required. It installs directly into the drive’s DPI (Drive Peripheral Interface) port, providing seamless integration with ControlLogix and CompactLogix architectures.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Communication Adapter Module |
| Network Protocol | ControlNet |
| Data Rate | 5 Mbps (fixed) |
| Interface | DPI (Drive Peripheral Interface) |
| Compatible Drives | PowerFlex 70 / 700 / 700H / 700S / 750 series (and DPI devices) |
| I/O Connections | Up to 20 CIP messaging connections |
| Control Mode | Scheduled + Unscheduled messaging |
| Network Topology | Redundant coaxial support |
| Update Time | ~5 ms network update cycle |
| Power Consumption | ~275 mA @ 5 V DC (from drive) |
| Operating Temperature | -10°C to 50°C |
| Storage Temperature | -40°C to 85°C |
| Humidity | 5–95% non-condensing |
Dimensions & Weight
| Item | Value |
|---|---|
| Dimensions (H × W × D) | 103 × 80 × 16 mm (approx.) |
| Weight | 0.47 kg (approx. 1.0 lb) |
Its compact plug-in design allows direct installation into the drive chassis without requiring external wiring, minimizing cabinet complexity and improving system reliability.
Recommended Related Models
- 20-COMM-E – Ethernet/IP communication adapter for modern networks
- 20-COMM-P – Profibus communication module for Siemens environments
- 20-COMM-M – Modbus RTU/TCP communication adapter
- PowerFlex 750 Series Drives – New-generation platform with embedded Ethernet
- 20-HIM-A6 – Human Interface Module for local drive control
These communication modules allow flexible integration across different industrial network standards.
Popular Allen-Bradley Models (Communication & Drive Ecosystem)
- 20-COMM-C
- 20-COMM-E
- 20-COMM-P
- 20BC043A0AYNANC0 PowerFlex 700
- 25B-D017N104 PowerFlex 525
The ControlNet-based modules remain important in legacy deterministic networks, while Ethernet-based solutions dominate newer installations.
