M Code => input contact in classic ladder?

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15 Oct 2013 09:34 #39844 by DaOne
I am trying to use a custom M code to give me an input conact inside classic ladder. Is this possable? If so maybe I could get an example?

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15 Oct 2013 09:41 #39845 by DaOne
Just to be more clear I would be using the user defined M-codes (M100 to M199).

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15 Oct 2013 13:54 - 15 Oct 2013 13:58 #39847 by cmorley
use the M code to manipulate classicladder's HAL pin(s).

From the Manual:
www.linuxcnc.org/docs/2.5/html/gcode/m-c...tml#sec:M100-to-M199

It shows an example using the parport but classicladder would be the same.

eg: setp classicladder.0.in-00 True

would set %I0 true inside classicladder.

Chris M
Last edit: 15 Oct 2013 13:58 by cmorley.

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15 Oct 2013 13:59 #39848 by DaOne
So the classic ladder pins can be referenced exactly the same way as hardware pins correct?

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15 Oct 2013 14:03 #39849 by cmorley
As long as the classicladder pin you are wanting to change is not connected to a signal.

If it is connected to just a signal then you must manipulate the signal.
If the signal is also connected to a driving pin then you can't manipulate it because it already has a 'master'

Classicladder pins behave just like any other component' HAL pins.

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15 Oct 2013 14:11 #39851 by DaOne
If the pin has been named in hal is it still able to be used directly? I think I remember it can't be accessed from a M-code script by name correct?

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15 Oct 2013 14:16 #39852 by cmorley
Not following you there: 'named in hal'

If you mean connected to a signal in the HAL file then yes you can't manipulate it directly.
see above

Or just try it.

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15 Oct 2013 14:43 #39855 by DaOne
Sorry I am trying my best to learn the lingo. I guess it would be considered a signal when to assign a " name" to the hardware pin to reference it in a more human readable form. I am very limited to trying it because the machine is 20 miles away. Is there anyway to simulate a 5i25 / 7i77 so I can load without errors on my home pc?

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15 Oct 2013 18:10 #39866 by andypugh

Is there anyway to simulate a 5i25 / 7i77 so I can load without errors on my home pc?

Not at the moment, no.
It would be possible (but tedious) to create a HAL component that created all the same pins as a 5i25 but you would need a separate one for each firmware combination, and making it actually behave like a 5i25 would be a lot more work on top.

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15 Oct 2013 18:48 - 15 Oct 2013 18:49 #39871 by BigJohnT

Sorry I am trying my best to learn the lingo. I guess it would be considered a signal when to assign a " name" to the hardware pin to reference it in a more human readable form. I am very limited to trying it because the machine is 20 miles away. Is there anyway to simulate a 5i25 / 7i77 so I can load without errors on my home pc?


The easy way to test the syntax of a HAL snippet in your situation is to use Axis Sim and just create a pin with the net command.

linuxcnc.org/docs/html/hal/basic_hal.html
net nameofmypinthatdoesnothing

in your M1xx file do something like
#!/bin/bash
halcmd setp nameofmypinthatdoesnothing True
exit 0

OR run the classicladder example and use the classicladder pin name...

JT
Last edit: 15 Oct 2013 18:49 by BigJohnT.

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