Pre-requisites for Online Upgrade

The following pre-requisites before you start an online upgrade:

• At least one pair of redundant servers

  This allows you to upgrade one server at a time while the redundant server assumes primary operation, avoiding downtime and loss of data.

• Upgraded project compatibility

  Check that your project runs and works properly on the new version of Plant SCADA before migrating to production and starting the online upgrade. If your project is complex, it is recommended that you have a test environment as the offline upgrade could be complex and could involve a long server downtime if done on your production system.

• Restored runtime files

  Check that you have restored the necessary files for runtime in the appropriate directories to avoid any disturbances to the upgraded live system. Refer to the list of configuration files in the topic Prepare your System for Upgrade and place them in the corresponding directories.

• Captured data files

  To allow historic data to be restored into the new version, you need to assess and move data files to the required location during the upgrade process. This is described in detail in the online upgrade steps in the relevant sections.

• System configuration

  We recommend leveraging your current redundant system and adding the following Citect.ini parameters before the online upgrade:

  • [LAN]EarliestLegacyVersion: Use 8400 for version 2023 or 8500 for version 2023 R2. This will allow your upgraded servers to accept connections from the older version.

  • [Alarm]EnableStateLogging: Set this parameter to 1 to allow logging the alarm synchronization messages into the syslog file.

  • [Debug]Kernel = 1 (optional): This allows you to use the Kernel to monitor progress during the upgrade.

See Also

Online Upgrade from Plant SCADA 2023

Online Upgrade from Plant SCADA 2023 R2