A-B 20COMME Communication Module

A-B 20COMME Communication Module

The 20COMME is an Allen-Bradley PowerFlex communication adapter module, mainly used to add EtherNet/IP network communication capability to compatible PowerFlex variable frequency drives (VFDs).

Product Information

• Brand: Allen-Bradley (Rockwell Automation)
• Part Number: 20COMME
• Type: Communication Adapter Module
• Function: EtherNet/IP communication interface for PowerFlex drives
• Network: EtherNet/IP (industrial Ethernet)

Compatible Systems

The 20COMME module is typically used with:

• PowerFlex 70 series
• PowerFlex 700 series
• Some PowerFlex 750 / architecture-class drive systems (depending configuration)

It is not a standalone PLC module — it is an option card installed inside or on the drive.

Technical Characteristics

• Communication protocol: EtherNet/IP
• Data rate: 10/100 Mbps
• Power supply: 5 VDC internal from drive interface
• Current consumption: approx. 350 mA
• Function type: DPI (Drive Peripheral Interface) to Ethernet gateway
• Topology: Single or multi-drive communication depending setup

Main Functions

This module allows the drive to:

• Communicate with PLC systems (e.g., CompactLogix, ControlLogix)
• Receive speed reference commands over Ethernet
• Send status, fault, and diagnostic data back to PLC
• Integrate into SCADA systems

So it acts as a bridge between PowerFlex drive and industrial Ethernet network.

System Role (Simple Explanation)

PLC / SCADA system
→ EtherNet/IP network
→ 20COMME module
→ PowerFlex drive
→ Motor speed control

It does not control the motor directly; it enables network control of the drive.

Application Areas

• Conveyor systems
• Pump control systems
• HVAC fan systems
• Industrial automation lines
• Process control systems
• Energy management systems

Advantages

• Enables full network control of VFDs
• Real-time monitoring of drive parameters
• Reduces hardwiring (no analog speed wiring needed)
• Easy integration into Rockwell automation systems
• Reliable industrial Ethernet communication

Precautions

• Must match correct PowerFlex drive series
• Requires proper EtherNet/IP network configuration
• IP address and node settings must be correctly assigned
• Not usable as a general PLC communication module
• Installation must follow drive power-off safety procedures