Historian is used to store process data with high-time resolution for longer periods of time (i.e., several years). Intelligent data compression optimizes storage capacity needs as well as access time.

Binary and text data are stored with a time resolution of 100 nanoseconds and analog data with 1 millisecond. Pro analog-PV can be configured either according to the "dead-band" or the "swinging-door" principle. The goal of these algorithms is to store only the data point values with significant activities.

The disk storage area will be organized in partitions per day, week or month. These partitions can be individually exported to and imported from any desired backup medium.

Reading programs can receive data either in the way they have been stored (i.e., each individual change in value) or as accumulated values (medium, medium, maximum variance according to OPC HDA standard) per time interval.

Since configuration data may change over time, Historian also stores configuration data changes.

RTAPLS configurations guarantee a maximum permanent load of 40,000 analog value changes per second.

The redundancy concept ensures complete archives even if computer failures occur

RTAPLS objects or the objects of RTAPLS Historian form a hierarchy. All pieces of information made available by RTAPLS can be found in this hierarchy and are available in RTAPLS REPORT in a way similar to a relational database with SQL-access.

The RTAPLS OLE DB Provider gives a database view of these objects, with tables of binary PVs, analog PVs, stations, etc. The single objects (PVs) form the records of these tables; the attributes of the objects form the columns of the tables.

RTAPLS OLE DB Provider implements a subset of SQL that enables and combines this data with the help of SQL SELECT instructions. All software tools that support OLE DB Providers are therefore able to access all RTAPLS objects and attributes.

An example of this is the production of reports with Crystal Reports or Microsoft Excel.

Further possible applications are Web-Server for intranet applications and ad hoc information queries.

The export from the RTAPLS OLE DB Provider to a Microsoft Access or SQL Server databank is also easily possible.