Formula block ignoring calculus

[Vinicius]

Hi everyone,

I'm trying to make formula block works, the formula is ( 685 - ( ( 777 / 10000 ) * A ) ) = MI 12,  where A is MI.

This keeps me giving me 675 as result. Doesn't matter the A value.

I tried also to work with "0.0777" and "0,0777", and changed the MI's to ML's but I didn't get the right result.

Thanks

[Joe Tauser]

PLCs don't do floating point very well if integer data types (MIs) are part of the considered equation.  Your 777/10000 term and your decimals are less than 1 and getting thrown out when the formula block executes.

If you want decimal points do everything in MF data types and build your formula out manually.

Joe T.

[Flex727]

19 minutes ago, Joe Tauser said:

If you want decimal points do everything in MF data types and build your formula out manually.

Or do some math ahead of the formula block to ensure any division results with integers are greater than 1 and big enough to provide the needed precision. Then you can sort out the decimal location afterward.

[Vinicius]

Thank you guys,

I made manually, and works fine.