Regarding DDV instruction in AB

Hi guys,

I've come across one of the program which consists of DDV instruction. I tried to search the help & instruction manual, the explaination is just very brief.

I know it consists of Source, Destination and relative to Math register which is S:13 & S:14.

If I'm correct, the S:13 & S:14 is the combination of 2 16bits value to form a 32bit value (>32767).

The 32 bits value (S:13 & S:14) will be divided by the source?

Hope someone can guide me. Thank you.

Your post is correct. You do need to make sure that the DDV is used immediately after another math instruction that would correctly populate S:13 and S:14.


Keith

You can download the instructions set referencem manual from AB's literature library.

http://literature.rockwellautomation.com/idc/groups/literature/documents/rm/1747-rm001_-en-p.pdf


In addition to 32 bit division, the DDV instruction can also be used to obtain an unrounded quotient and remainder. Its actually a very useful instruction.