Allen-Bradley 20-COMM-H | PowerFlex RS-485 Communication Adapter

Overview

The Allen-Bradley 20-COMM-H is a PowerFlex Architecture Class RS-485 HVAC-to-DPI communication adapter engineered for seamless integration into PowerFlex 70 and 700 drives. Manufactured by Rockwell Automation, this module enhances connectivity by supporting both Modbus RTU and Metasys N2 protocols.

Technical Specifications

• Manufacturer: Rockwell Automation

• Brand: Allen-Bradley

• Catalog Number: 20-COMM-H

• Voltage: 400V AC

• Current: 1.3 Amps

• Power Rating: 0.37 kW (0.5 Hp)

• Phase: 3-Phase

• Frame Size: A

• Enclosure: Panel Mount – IP20, NEMA/UL Type 1

• Interface Module: Blank Cover

• Feedback: No feedback, enhanced control mode

• Compatible Drives: PowerFlex 70 and PowerFlex 700 series

Design and Installation

The 20-COMM-H is designed as a user-installed module that mounts directly on supported PowerFlex drives. Captive screws ensure secure grounding to the drive chassis, increasing safety and reducing vibration issues in demanding HVAC environments.

Connectivity and Protocols

Supporting RS-485, this adapter enables reliable communication with Modbus RTU and Metasys N2 networks. The integration allows PowerFlex drives to communicate efficiently with building automation systems and industrial controllers.

Compatibility and Tools

The 20-COMM-H works seamlessly with various Rockwell configuration tools, including the integrated PowerFlex HMI. Through the DPI (Drive Peripheral Interface), users gain simplified setup, parameter adjustment, and diagnostic capabilities.

Applications

Engineered for HVAC systems, the 20-COMM-H provides robust connectivity in industrial and commercial environments. Its compact design and wide protocol support make it an essential module for upgrading PowerFlex 7-class drives with enhanced communication performance.