double-word to single-word

Hello everybody...Im using IDEC PLC and. I have a problem with single-word and double-word issue.

example: when im using Multiply (Word) instruction
2475 (Source1) x 100 (Source2) = 247500 (Data1) (all are data registers)

Then use a divide(Word) instruction for value 247500. The problem is, in divide instruction the value of Data1 is not 247500, it shows 50892.

example: 50892(Data1) / 10000 = 5
so how can i get the value --> 247500 / 10000 = 24 ?

please anybody help me...

Looking at the numbers should give you a clue as to what is wrong.

If you remove the high word of the 247500 you are left with 50892. More than likley you are looking at only the low word of the result but other things can be wrong. Look to be sure that the divide's data type is correct (Double, Long, Float), or be sure you're not overwritting the high word's address, etc.

Use the custom monitor in WinLDR to verify your results.

Good luck

Ken

thx for the tips

Another possible method could be to do the divide first, then do the multiply, that way would stop your answer exceeding single word size, BUT it may create other problems if exact accuracy is required.