how can i calc. standard deviation in slc500

plc model is ab slc 5/04. There is no command for standard deviation . And i wrote it in ladder but there is too many constant and indirect adress.
 
Using a SLC 5/04, which has file word lengths of 256, you need to limit your "population" to 256 maximum. However you should have enough room to calculate any standard deviation of any population up to 256.
 
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