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problem with Pe equation

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Hi,

This is my first post here. I am currently in an internship as a Pi programmer and i do not have access to pipetest.exe or the log files of this Pi System (I have no access whatsoever to the server utilities). I am having problems with the following Pe equation and am at loss as to why i get a 'Calc Failed' value everytime it calculates. I have access to almost no ressources except a home-made program to create the tags, the Pi system explorer and Datalink.

Here is the Pe equation in question:

 

(TagVal('260-235-VIF-130.II.CAL','t')-TagVal('260-235-VIF-130.II.CAL','y'))/(TagVal('260-235-ICR-264.K-Run_time.CAL','t')-TagVal('260-235-ICR-264.K-Run_time.CAL','y'))

 

It is supposed to calculate the average of the current of some machines. (difference in total current over a day and the machine's runtime).

I have many tags like this one and they all have the same problems.

PS:I have verifie the tags used in the equation and they are working correctly, also, they do have values at timestamp "y" and "t".

Thank you very much in advance for all your help!


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