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Harmony HMI - Internal Communications Method failure appears in System Message Log when communicating via Ethernet/IP protocol

Published date: 06 November 2019

Issue
When communicating to an Allen Bradley PLC with Ethernet/IP, a recurring message of Internal Communications Method failure appears on my Harmony HMI. 

These messages alternate on the System Message Log:
"Internal Communications Method failure"
"The specified address is invalid."


What do I do?

Product Line
Vijeo Designer, HMISTU, HMIGTO, HMIGTU, Harmony iPC

Environment
HMI communication via Ethernet/IP protocol

Cause
This is a known issue involving Allen Bradley CompactLogix and ControlLogix of versions equal or higher than v31 that is fixed in Vijeo Designer v6.2 Service Pack 9.

Resolution
Please update your HMI to Vijeo Designer v6.2 Service Pack 9.

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