RSlogix5000 Floating number range

rdrast

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• Jul 15, 2015

• #16

yuenli said:

Thanks for all the replies.

What is the best way for me to handle this number range and being able to display this in the correct format?

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That depends. What are you actually trying to represent?
Are there always going to be six trailing zeros?
If you really need to handle 10 digits with accuracy, I'd probably just use two DINTs, and split the number down into the lowest 5 digits in one, and the highest 5 in another.

 

yuenli

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• Jul 15, 2015

• #17

The value I am trying to display is for a Flow meter that is totalizing in gallons. I need to be able to represent the scale value and display it in a HMI.

 

bernie_carlton

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• Jul 15, 2015

• #18

Accumulate enough pulses for 1000 gallons in a counter. When it is done increment a 'thousands of gallons' tag and reset the counter. Display the 'thousands of gallons' tag. If needed also display, next to it, the counter value.

For viewing purposes is the exact unit gallon figure important?

 

skylerhart

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• Apr 6, 2019

• #19

I know this is an old thread, but it was one of the top search results for me when I was wanting to read a bit about the REAL data type. For anyone who's on a similar path, I found the following two articles that I thought really shed some light on floating-point data types:

https://community.alteryx.com/t5/Al...t-numbers-are-surprisingly-strange/ta-p/29049

https://www.exploringbinary.com/why-0-point-1-does-not-exist-in-floating-point/

I also found this, but, well, it's a bit beyond the scope of a brief tutorial.

https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html

 

Peter Nachtwey

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• Apr 6, 2019

• #20

I am curious why there is a need for such a big number.
perhaps displaying the number as 9999.000000M would do use a DINT for sub million counts and another for conting millions.
I am also curious when people will start asking for LINTs.

 

gottspeed

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• Apr 7, 2019

• #21

Yeah, pretty simple. MSW and LSW. Overflow LSW @ 9,999,999 into MSW. If required, take a pulse every tenth of a gallon so your last digit is in tenths.