Allen Bradley 20-COMM-H Communication Adapter

Allen Bradley 20-COMM-H Communication Adapter

Configured for RS-485 HVAC network interfacing in PowerFlex drive systems, the Allen Bradley 20-COMM-H (20-COMM-H Communication Adapter) provides direct physical/electrical execution between Modbus RTU, Siemens Building Technologies, Metasys N2 protocols and PowerFlex DPI communication networks.

Hardware Specifications

EtherNet/IP and Industrial Drive Communication Characteristics

The 20-COMM-H communication adapter operates as an interface module between RS-485 HVAC communication networks and Allen Bradley PowerFlex drive platforms. The adapter supports Modbus RTU, Siemens Building Technologies, and Metasys N2 protocol communication while maintaining DPI communication with compatible PowerFlex drive architectures.

The module supports DPI communication rates of 125 kilobits per second and 500 kilobits per second. Communication parameters are configured according to the connected protocol requirements, including selectable Modbus RTU baud rates and fixed Metasys N2 communication operation.

The adapter is designed for integration with PowerFlex 70, PowerFlex 700, PowerFlex 700H, PowerFlex 700S, PowerFlex 700L, PowerFlex 750, and PowerFlex DC drive families. The captive screw mounting method provides mechanical retention within the drive communication interface assembly.

Frequently Asked Questions (FAQ)

Q: Which drive families are compatible with the 20-COMM-H adapter?
A: The 20-COMM-H is designed for PowerFlex 70, PowerFlex 700, PowerFlex 700H, PowerFlex 700S, PowerFlex 700L, PowerFlex 750, and PowerFlex DC drive platforms supporting DPI communication.

Q: What communication protocols are supported by this adapter?
A: The adapter supports Modbus RTU, Siemens Building Technologies, and Metasys N2 communication protocols through an RS-485 HVAC interface.

Q: What is the module power requirement from the drive interface?
A: The adapter consumes 150 mA at 5 VDC from the connected drive communication interface.

Field Installation Guidelines

Install the 20-COMM-H adapter using the specified captive screw mounting points to ensure mechanical fixation inside the PowerFlex drive assembly.

Use appropriate RS-485 wiring practices, including twisted pair conductors, correct signal polarity, and cable routing separation from high-voltage power conductors. Connect the communication cable shield according to the system grounding design to reduce electrical interference.

Verify protocol settings, baud rate configuration, and DPI communication parameters before placing the drive network into operation. Confirm that the installed drive firmware and communication interface configuration support the selected adapter operation.

Maintain the NEMA Type 1 (IP20) enclosure requirements by installing the module inside the intended drive enclosure environment and protecting the assembly from moisture, conductive contaminants, and mechanical damage.