Mitsubishi Q Series: Converting a float to an Integer

Mas01

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Mas01
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Oct 2020
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How do I convert a float to an integer?


I've got a floating-point number D606, value 3999.863.
I need to convert it to an integer (4000), then I need to move it into Data register D600 (integer), which is then output on a Digital to Analogue card , Q68DAIN (Mitsubishi Q-series). This integer value of 4000 should output 20mA.


Is there such a command like this & will it work? :


-----[INT D606 D600]---


Anyone help?
 
Last edited:
Mitsubishi will not allow mixed int/floats on maths and as there are many built in functions for conversion so there is no need.
Int to float, float to int, Dint to float, Float to Dint, Bool to word, BCD to int etc.
 
parky said:
Mitsubishi will not allow mixed int/floats on maths and as there are many built in functions for conversion so there is no need.
Int to float, float to int, Dint to float, Float to Dint, Bool to word, BCD to int etc.
Click to expand...

What's the difference between Int.and Dint? Maybe I should have converted to Dint (instead of int) for sending it out on the AO card, although I did get the correct mA I was expecting.
 
An integer is a value from -32767 to + 32767 a Dint is a double word cannot remember how big it is but it's into the millions so no you do not need a Dint as the analogue card only goes up to a max of 32767 (4000 in your case).
Therefore all analogue cards (Mitsubishi) only use integers.
 
parky said:
An integer is a value from -32767 to + 32767 a Dint is a double word cannot remember how big it is but it's into the millions so no you do not need a Dint as the analogue card only goes up to a max of 32767 (4000 in your case).
Therefore all analogue cards (Mitsubishi) only use integers.
Click to expand...

Cheers, clear explanation as ever.
 
A signed double(32 bit) is 2,147,483,647 to -2,147,483,648.
An unsigned Double (32 bit) is 0 to 4,294,967,295
Argh Alan beat me to it.
 
Final story:

  • 16-bit signed INT range is -32,768 to +32,767 i.e. -(2^15) to (2^15)-1
  • 32-bit signed DINT range is -2,147,483,648 to -2,147,483,647 i.e. -(2^31) to (2^31)-1 (argh parky and alan beat me to it ;))
Caveats

  • If the float is outside the range of the INT (or DINT) conversion function by which it is being converted, the result may be undefined, or may even cause a fault.
 
lol, Even I could not remember the max on DInt, never need to think about it, never needed such a large number a few million is usually enough.
 

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