For a maintenance technician or machine operator working on multiple TTDs, it is helpful to have a dashboard showing which of the testers requires the next manual intervention.

A production, quality or maintenance manager would like to have all the relevant, currently active errors and warnings of the TTD visible on a MES system or dashboard.

A production or quality manager wants to know the date of the last and upcoming calibration or maintenance task on the TTD.

A production-, quality- or maintenance manager would like to have all the recent errors and warnings of the testing device visible on an MES System or Dashboard. To achieve this goal the general history mechanism for events as defined in OPC 10000-11, OPC Unified Architecture - Part 11: Historical Access is used.