Why won't this calculate

Tom@Pton · Nov 6, 2014

XIC B3:12/9 BST XIC O:2.0/2 NXB XIC O:2.0/1 BND GRT N7:30 0 GRT N7:40 0 BST CPT N7:79 ( N7:75 | ( N7:40 - N7:30 ) ) * 3600 NXB NEQ N7:29 N7:79 ONS B3:14/7 BST DIV T4:38.ACC T4:38.PRE F8:65 NXB MUL N7:79 F8:65 N7:83 NXB MOV N7:83 T4:38.ACC BND BND

Frustrated and I can't figure out how to post a pdf either.

Have I entered the cpt portion correctly?

Ron Beaufort · Nov 6, 2014

are you sure that the processor is scanning the rung? ... did you start a new ladder file - and forget to put a JSR in the main file? ...

Tom@Pton · Nov 6, 2014

no, I am attempting to drive myself nuts (60|(600-100))*3600 may work on my calculator but doesn't work for didly with integers. Guessing now they should have been F.

Ron Beaufort · Nov 6, 2014

that's probably the answer - I'll check back after supper - but I think that you're on the right track with the integer/float idea ...

kolyur · Nov 6, 2014

Tom@Pton said:
(60|(600-100))*3600 may work on my calculator

60/500 is 0.12 which will round down to zero if you're using integers.

Tom@Pton · Nov 6, 2014

kolyur said:
60/500 is 0.12 which will round down to zero if you're using integers.

My workaround was to multiply by 3600 but as we all know 0*3600 is still 0.
Just 2 days what the hell.

baldone · Nov 6, 2014

Instead of a compute function I would break the formula into a sequence of math operations to work out the kinks.

TConnolly · Nov 6, 2014

Try this

CPT N7:79 3600.0 * ( N7:75 | ( N7:40 - N7:30 ) )

Make the constant a float to force type casting the other elements to a float for the computation. Your result will still be a rounded integer.

kolyur · Nov 6, 2014

TConnolly said:
Try this

CPT N7:79 3600.0 * ( N7:75 | ( N7:40 - N7:30 ) )

Make the constant a float to force type casting the other elements to a float for the computation. Your result will still be a rounded integer.

Doesn't compile on my system. If any of the operands are floats, the destination must be a float.

EDIT: Compiles on a SLC but not on a ML1400... interesting.

iant · Nov 6, 2014

with a calculator all numerical values are Floating Point.
So YES it must be done in 'F' not 'N'
try using your calculator by deleting any amount after the Decimal point

(60|(600-100))*3600
1. = 600-100 = 500
2. = 60 / 500 = 0.12 {remove the 0.12} = 0
3. = 0 * 3600 = 0
this is the Correct answer if you use integers
STEP 2 is causing the problem
with out the error
2. = 0.12 * 3600 = 432

lets change your formula to ((60 * 36) / (600 - 100))*100

1. = 600-100 = 500
2. = 60 * 36 = 2160
3. = 2160/500 = 4.32 {- 0.32} = 4
4. = 4 * 100 = 400

you can play with that if you still want to use Integers

iant · Nov 6, 2014

note that an Integer value of 216000 is a bit high

Why won't this calculate

Tom@Pton

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iant

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