GX Works/QCPU - SD520 current scan time

Hi,

I have a high speed counter card and I'm trying to use SD520 to use the scan time for calculations.

Every time I use it the CPU goes into error. From what I can see it is because I'm dividing by zero. How do I correctly use SD520? Does it need to be initialised?

Or is there some way to not use it on the first scan so the value isn't zero?

Thanks

Perhaps use the first scan pulse SM402 to disable the calculation - or just test the value is always > 0?

Regards

Cheers,

Will try that now.