Subsequently Changing Definition Files - Siemens sinumerik 840d sl Configuration Manual

Configuring variables
6.3 Configuring GUD tags
6.3.4

Subsequently changing definition files

If definition files are changed, the database must be re-created using the "WinCC import NC
userdata" GUD tool.
If a new data item must be included in a definition file, then we recommend that this data
item is attached to the end of the file. The addressing of the previous data item therefore
remains unchanged. The already existing HMI tags remain correctly addressed.
If a data item must be inserted in existing GUD, this changes the addressing of the
subsequent data. As a consequence, the runtime would access incorrect data. To prevent
this, already configured HMI tags must be configured to the data "shifted" into the definition
file using the variable editor.
If existing data is changed, after updating the database, the modified data must be opened in
the WinCC variable editor using the "WinCC import NC userdata" GUD tool and possibly
corrected.
Check the usage of the modified variables (e.g. data type) in the I/O field.
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SINUMERIK Integrate Create MyHMI / WinCC V13 SP1
Configuration Manual, 11/2014