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Allen-Bradley 20-COMM-H


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All Parts Come with 12 Month Warranty

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Warranty Information

All products (new, surplus, and refurbished) are covered by Chief Automation's 1 Year Warranty. The Manufacturer's Warranty does NOT apply.

Shipping Information

We offer free standard shipping. Products located in the U.S. are eligible for expedited shipping, including next day air.

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Product Specifications

brand name Allen-Bradley

The 20-COMM-H Communication Adapter

The 20-COMM-H is a communication adapter designed by Rockwell Automation, specifically for use with PowerFlex 70, 700, 700H, 700S, 700L, and 750 Series drives, as well as PowerFlex DC drives. It is a Class RS-485 HVAC to DPI communication adapter, which facilitates communication between HVAC systems and the PowerFlex drives. The adapter is designed to operate in a 32-bit adapter mode, requiring a minimum of two registers to read or write, and is always an even number since two 16-bit registers are read for each 32-bit operation.

Technical Specifications

  • Voltage: 400V AC
  • Phases: 3
  • Amps: 1.3
  • kW (HP): 0.37

Alarm/Error Codes

The manual does not provide specific information on alarm or error codes for the 20-COMM-H adapter. For troubleshooting and technical assistance, users are advised to refer to Chapter 8 of the user manual, which covers troubleshooting procedures, or to contact Rockwell Automation's technical support team.

User Manuals

The user manual for the 20-COMM-H adapter is available from Rockwell Automation and provides detailed information on the adapter's features, installation, and operation. The manual covers topics such as getting started, components, features, and troubleshooting.


Troubleshooting procedures for the 20-COMM-H adapter are outlined in Chapter 8 of the user manual. These procedures cover common issues and their solutions, including network connection problems, adapter status indicators, and node address configuration.


The 20-COMM-H adapter does not require specific programming for its operation. It is designed to operate with PowerFlex drives and HVAC systems, and its configuration is typically handled through the drive's programming interface.


The adapter is designed to be installed into a PowerFlex 7-Class drive, and it can also be used with other Allen-Bradley products that support a DPI adapter. The installation process involves connecting the adapter to the drive and configuring its settings according to the drive's specifications.

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