Upgrade Method

Getting Started > Upgrading to Citect SCADA 2018 > Upgrade Method

Before you plan to upgrade to Citect SCADA 2018, consider whether your SCADA system can afford downtime and whether all of your historical information needs to be available at all times. The upgrade method you choose will depend upon this.

Upgrade methods are of the following types:

Offline: This method requires your system to be shut down for the duration of the upgrade. If your system can afford downtime and depending on whether all of your historical information needs to be available at all times, this method is suitable for you. This is the basic upgrade process that will be required even if you use the online upgrade method.
Online: If you need your system to be available at all times, this method is suitable for you. To be able to conduct an online upgrade, you need to have at least one pair of redundant servers (for details and other pre-requisites, see Pre-requisites for an Online Upgrade.)