Basic information on correction values and laboratory values

Using the panels for correction and laboratory values you can:

Retrieve values from the HistoryDB.

Change existing values (=correct).

Add new values to the HistoryDB.

This can become necessary, for instance, if a sensor is found to be faulty and produces incorrect readings. In this case, you can post-correct the measurements log (for example, by using data from another measurement or estimated values).

Note

The original values are not lost. You can only change the correction values, not the periphery and default values.

In the Laboratory Values panel you can, as in the Correction Value panel, enter, edit and read out data that has been saved in the historical database. The difference is that the Laboratory Values panel has been designed specifically for manual input, that is, for measurements that do not enter the WinCC OA system through a peripheral interface, but are entered by hand such as readings that have been taken in a laboratory.

The Laboratory Values panel only displays those data point types and data points that have a function "Man" (for "manual input") in the first compression level C1. This is the case if the "MAN" function has been enabled instead of statistical functions in the compression settings for the corresponding data point type or data point (see Archiving and Compression).

Chapter	Content
Requirements for changing a value	Considerations when making changes to values.
Panels for setting correction and laboratory values	How to access the panels and their relevance.
Correction Values Settings panel	Specifying data points and the database readout period.
Correction Values panel	Entering, editing and reading out historical data supplied by peripheral devices.
Laboratory Values Settings panel	Specifying data points and the database readout period.
Laboratory Values panel	Entering, editing and reading out historical data that has been entered by hand.
Working with the panels	Examples with links
Working with correction values	Example for working with correction values
Working with laboratory values	Example for working with laboratory values
Summary and other relevant chapters	Summary and links to other relevant chapters

Note

If necessary please look again at the following chapters: Archiving, HistoryDB and Archiving/Compression.

V 3.11 SP1