General

With WinCC OA Version 3.20, the handling of deactivated _alert_hdl configurations has been changed. In previous versions, even if the alert handling was deactivated, the Event Manager still provided alert previews.

To increase the overall performance of WinCC OA, this behavior has now been disabled and no alert previews will be generated.

Since the behavior of the earlier versions was also used in other areas of application, e.g. in order to use a text-attribute (_offline..text) to obtain additional information for value changes in historical queries, it may be necessary to reactivate this for your use case.

To reenable the behaviour of older versions, the config entry [event] enableAlertPreview can be set.

[event]
enableAlertPreview = 1

As of WinCC OA Version 3.20, the DP Comment in the _common config is split into the sections comment, format and unit. This ensures easy handling of translatable content with the translator tool in the future