The archiving module guarantees a long-term logging of process variables with a limit resolution of 1 second. The module is highly efficient, allowing a typical operator workstation to register - with maximum resolution - data sets of tens of thousands variables without interfering with the other functions of the workstation.

The basic data recording format is a proprietary structure based on daily files. Archiving in the MS SQL base is also provided. Apart from the basic mode of operation, i.e. continuous archiving with determined logging periods, the module also offers some additional modes:

• conditional archiving, i.e. archiving executed only when the selected process variables meet the condition defined by the application designer

• post mortem” reports, which builds the trends of indicated process variables for the given period before and after the triggering conditions ( defined as functions of selected process variables ). A browsing function of the “post mortem” reports is also supported

• simultaneous tracking of the current and the archived trend of a process variable in the selected historical interval

• so-called “pattern curves” i.e. the environment for defining and presenting the trends compliant with the process operation guidelines, which – if superimposed on the real trends of the process values – inform the operator about the process control quality

• historical data merging, i.e. the mode, when the system, after repairing the failure of a communication channel, automatically supplements the contents of the archive, based on the data saved in the controller or a data source buffer

• manual entry of missing data based on written or telephone reports
   

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