axis status

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21 Jun 2011 15:23 #10703 by piasdom
axis status was created by piasdom
is there a pin to show an axis is moving?
want to use a pyvcp led to show movement.
Thanks !


kenneth

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21 Jun 2011 15:59 #10708 by andypugh
Replied by andypugh on topic Re:axis status
I think that you might have to use a comparator on the velocity pin value:
www.linuxcnc.org/docview/html/man/man9/comp.9.html

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21 Jun 2011 16:34 #10713 by piasdom
Replied by piasdom on topic Re:axis status
Thanks, i tried that but leds are bits(right ?)and comp wants
float in. don't think i can use u32 or s32(floats ?) with leds.
if so, please point to where i can read more.

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21 Jun 2011 16:38 - 21 Jun 2011 16:38 #10714 by BigJohnT
Replied by BigJohnT on topic Re:axis status
Kenneth,

motion.current-vel will show the Current cartesian velocity as a float.

John
Last edit: 21 Jun 2011 16:38 by BigJohnT.

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21 Jun 2011 17:03 #10717 by andypugh
Replied by andypugh on topic Re:axis status
piasdom wrote:

Thanks, i tried that but leds are bits(right ?)and comp wants
float in.


Exactly. Comp takes float in (axis.N.joint-vel-cmd is a float) and outputs a bit on comp.N.equal if the two pins are equal.

So,
setp comp.N.in0 0
net v1 axis.N.join-vel-cmd => comp.N.in1
net led-not comp.N.equal => not.N.in
net led not.N.out => pyvcp.led.N

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21 Jun 2011 17:29 #10719 by piasdom
Replied by piasdom on topic Re:axis status
Thanks John and andy,
the comp i read didn't use setp, used loadrt.
never used setp. will look more into it.
T'ANKS

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21 Jun 2011 17:53 #10721 by BigJohnT
Replied by BigJohnT on topic Re:axis status
Andy left out the loadrt and addf part and you need to set in0 with setp.

John

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21 Jun 2011 18:43 #10723 by piasdom
Replied by piasdom on topic Re:axis status
Thanks andy, that works great. is there somewhere i can read
what does what in this:

loadrt comp count=3
addf comp.0 servo-thread
setp comp.0.in0 0
net x1 axis.0.joint-vel-cmd => comp.0.in1
net xled-not comp.0.equal => not.0.in
net xled-equal not.0.out => pyvcp.x-moving

all the doc i find are not too specific. i can't see why
axis.0.joint-vel-cmd can't be connected to pyvcp.x-moving
directly. but i have trouble with what John got to work for
my pause/resume. maybe this explains it better. toggle ?
what does it toggle ? i to 0 - true to false ? toggle the state ?
mode ? my lights :)

thanks again !!!!

kenneth

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21 Jun 2011 18:44 - 21 Jun 2011 18:46 #10724 by piasdom
Replied by piasdom on topic Re:axis status
BigJohnT wrote:

Andy left out the loadrt and addf part and you need to set in0 with setp.

John


yea, saw that. also spelled joint as join :)
but didn't know setp set in0. no idea
what setp(set parameters) do. so i actually setting
set in0 to true or false ? with 0(false)
Thanks
kenneth
Last edit: 21 Jun 2011 18:46 by piasdom.

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21 Jun 2011 19:03 #10725 by BigJohnT
Replied by BigJohnT on topic Re:axis status
Nope, it is a float input.

With zero hysteresis, the output is true when in1 > in0.

www.linuxcnc.org/docview/html/man/man9/comp.9.html

John

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