pow10 function

Thank.

Andrivel78

why there is no pow 10 instruction for c7-300 / 400 in STEP7 ?

One explanation is that people who created STEP7 went to school and they, in their ignorance,  assumed that people who would use it, did it as well. 

Apparently in those ancient times when it was being developed, the speed of the controllers did not allow it to be done. And all the necessary calculations had to be done with a slide rule, for which a special person was supplied with the controller. Now, when an ordinary kettle is smarter than a computer that sent people to the moon, it would be possible to add some useful mathematical functions to the standard set.