We found a notable issue with the IEC 61850 MMS Client Driver module introduced in Ignition version 8.1.25 that can impact redundant systems.

The Issue

The issue prevents Backup Gateways from being able to synchronize with the Master Gateway. In simpler terms, this means the Backup Gateway will not be able to pull system changes from the Master Gateway.

You can identify the issue by two notable symptoms:

1. The IEC 61850 module will show a faulted status, stating “can’t find dependent libraries”
   
   
   
2. The Status > Redundancy Gateway page will show an “Incompatible (Modules)” error.
   

The Cause

This is caused by the IEC61850 module requiring a compatible Visual C++ Redistributable that has not been installed.

Recommended Actions

There are two ways to resolve the redundancy synchronization issue. The route you should choose depends on whether or not your Gateway needs to use the IEC 61850 module. 

If You Do Not Plan On Using the IEC 61850 Module

Simply uninstall the module, and then restart the Gateway. 

If You Do Plan On Using the Module

The steps to use the module depend on the Gateway’s operating system. 

Windows Systems

A recent version of the Redistributable must be installed. Through testing, we found that the following versions can safely resolve the issue:

• 2015-2019 version
• 2015-2022 version (the latest)

After installing, you must restart the Ignition Gateway for the changes to take effect. 

Check Microsoft’s documentation for more details on upgrading to the latest supported redistributable

Linux Systems

Required dependencies can be obtained by updating the operating system. We've tested the following versions and found they include the needed dependencies:

• Ubuntu 18.04+
• Debian 10+
• Fedora 28+