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zenon provides comprehensive tools for archiving and report creation. You always have an accurately archived and prepared data collection process and therefore a solid basis for competent and quick decisions. The variety of functions of data recording in zenon enables you to implement individual requirements without extra programming efforts.
The zenon Historian records process data on a lasting basis and archives it as desired – without any numerical limitation. An archive can contain any number of type-independent variables (binary variables, numerical variables, string variables). zenon makes a distinction between three types of archives:
- When a value is changed: each time a value is changed, the value that has changed is recorded. Superfluous entries can be avoided for flittering values by setting a hysteresis.
- Cyclical: records all values of an archive cyclically. The minimum cycle time is one second.
- Event-controlled: if a trigger bit is set positively, all values of an archive are recorded.
Each set of data that is saved in an archive also contains, in addition to the variable value, the time stamp in milliseconds and the variable status. The data can, therefore, also be historically sorted at any time for accurate analysis. Generally, zenon internally uses a resolution of a millisecond, even with external time-stamping.
- Unlimited number of archives and unlimited number of variables per archive; can be freely scaled
- Archives work in parallel
- Different archive types in parallel
- Time stamping in milliseconds
- Fully redundancy capable
- High performance from proprietary binary data format
- Integration with zenon Analyzer
Archive files and exporting
zenon saves archive files in its own binary data format. This makes the archives extremely powerful. They can be easily synchronized with redundant systems, easily administered and the data cannot be manipulated externally. The latter is primarily important for the requirements of FDA 21 CFR Part 11. However, all data can also be saved in CSV, dBase, XML or in an SQL database. When saving into an SQL database the data are stored in clear text and are still completely readable for the zenon Runtime.
Cyclical creation of archives and external storage
zenon divides archives into individual archive files cyclically. In order to keep an archive from becoming incredibly large, aggregated archives can be created. The time distance can be freely adjusted. However, archives can also be started and stopped through functions, for example, with a step or batch change. To save space on the data medium, archives can be automatically stored externally in data formats such as XML, CSV or dBase, as well as copied to backup systems or deleted.