Controlled Databases

If a Database (DB) is defined as a Controlled database, then all updates are controlled externally to the AVEVA base product. Both Update and Multiwrite databases can be Controlled.

The external system is accessed via an EDMSlink program, which must be supplied by the user. Users must claim elements in order to change them on Controlled databases. The EDMSlink program is activated by the AVEVA base product when a CLAIM or release is made. It is totally up to the user as to what the EDMSlink does. Normally it will link into a user’s central control system.

Only Primary elements can be claimed: see the appropriate reference manual for information about Primary elements in each module. For controlled DBs, claiming is based on element names; that is, until an element is named, no restrictions exist. However when a Primary element is named, the external system checks whether the name exists, and in future the name is always used to claim out the element.

The claim is only made the first time an element is updated. The element remains claimed until it is explicitly released.