4.2 Calculation Procedure

Upon starting the calculation the PCE tags to be checked are determined and the consistency of their related data is checked. Only if all relevant object structures for the calculation are available, the generation of the required projects is started. Since this analysis of the structure and the subsequent calculation can take more or less time, the user is informed about the status by means of a progress dialog.

Specifically, the following checks are performed:

Check/Result	Termination with explanatory error message
Is there another function below a found Ex-i tag which is likewise marked as an Ex-i tag?	Ex-i tag cannot be calculated. It contains another Ex-i tag.
Several active devices identified, but the main function does not contain the required attributes for corresponding measuring circuits.	Ex-i tag cannot be calculated. Circuit contains several active devices.
An active device in the main function does not contain a correct measuring circuit number. This is the case if the number is missing or it is not within the range [1,5].	Ex-i tag cannot be calculated. The measuring circuit numbers are not unique.
At a device, active and passive attributes are filled. Not all obligatory active or obligatory passive attributes are present at a device.	The Ex-i tag cannot be calculated. The device [device/cable name] is not unambiguously specified.
Devices without Ex-i data for which EX-i data are mandatory are connected to an Ex-i cable.	The Ex-i tag cannot be calculated. The function contains devices without Ex-i data

Finally, the calculation is carried out for the successfully tested tags.

If the wizard must be terminated because of the tests, or if it skips a tag during calculation, the user is informed about the corresponding messages in the project folder Messages.