Floating variables in Classicladder

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13 Feb 2010 15:21 #1876 by CrazyPenguin
Hello to all.......

I have a problem with comparison modules in Classicladder.......

Is posible to work with floating variables in Classicladder??? (but in floating format).-

In my case, i need to make a comparison in floating format, but the values are converted to S32 automaticly.-

any help will be sincerely grateful .-

Thankyou very much.-

Sebastian

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13 Feb 2010 17:52 #1878 by cmorley
No classicladder does not use floats internally.
as you found, they are converted to integers.
The float pins are just for convenience of connecting directly to floats
without using a conversion component.

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13 Feb 2010 18:00 - 13 Feb 2010 18:06 #1879 by CrazyPenguin
ok...... so is posible to make a conditional redirectioning of a floating variable?

p.e:

if A=0 then float out 1 => float in 1

if A=1 then float out 1 => float in 2

is posible to make this in emc2 (with Classiclader or werever)

Thankyou very much.-

Sebastian
Last edit: 13 Feb 2010 18:06 by CrazyPenguin. Reason: I confuse variable names

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13 Feb 2010 18:15 #1881 by cmorley
look at the component tristate_float :

www.linuxcnc.org/docs/devel/html/man/man9/tristate_float.9.html

maybe that could help you.

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13 Feb 2010 21:15 #1883 by CrazyPenguin
Yes, its working perfectly......... Thankyou very much cmorley.....

An additional question:

is posible to put two parallel output like a real tristate buffer?

float out 1 => tristate.0.in
float out 2 => tristate.1.in

tristate.0.out => float in 3
tristate.1.out => float in 3

is posible to make this (like a multiplexer)......... i intented to use the mux2 instruction but dont work!

Thanks again.-

Sebastian

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13 Feb 2010 23:07 #1885 by cmorley
What didn't work with the mux2 ?

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14 Feb 2010 14:28 #1894 by CrazyPenguin
I make following:

loadrt mux2 count=1
addf mux2.0 servo-thread

float out 1 => mux2.0.in0
float out 2 => mux2.0.in1

mux2.0.out => float in 3

setp mux2.0.sel FALSE

If i pt any value on float out 1 or float out 2......... the float in 3 value naver change!!!!

i do not know why?

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14 Feb 2010 18:24 #1900 by cmorley
strange it seems to work for me.....

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14 Feb 2010 21:27 #1903 by CrazyPenguin
hi cmorley...... you are correct......

i check again and again and finally found the problem ..... the instruction works perfectly and the problem is that I wrote "addf mux2 servo-thread" instead of "addf mux2.0 servo-thread"

thanks for yor help

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