It depends on your overall CP usage. If your scan times are running over,
your measured time will lag behind real time. Check the display in
CPNAME_STA:STATION to find out your CP loading. If you need very accurate
timing, your best bet is to use a TIM block that is started and stopped by
sequence blocks.
The method that you choose will be dependent on your need for accurate time
and your CP loading. If you are not close to overloading your CP (and you
don't think that you ever will be), the method that you describe will
probably work. I just converted a system over to using TIM blocks. When we
first started, counting time worked fine. Four years later, we have added
so much extra stuff in, that now I have to use TIM blocks. (The compounds
already had HLBL blocks to work with.)
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