Problems whit the switches in pncconf

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04 Feb 2022 11:35 #233964 by Nest
Hi everyone, I have a normal CNC milling machine and it has three home switches, an emergency stop and a probe to detect the part, the card I am using is a MESA 7i96

I have tried various configurations in pncconf for the home/limit switches but it gives me an error.
Can somebody help me?

thanks you

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04 Feb 2022 12:53 #233967 by tommylight
What error ?

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04 Feb 2022 21:40 - 04 Feb 2022 21:53 #233997 by Nest
Hi, if i select in the tab TB3 the switch X, Y, X home when i push the Button Home All in the screen down of the left the error
the switch home inactive before of beginning the movement of back a = 2



And if I select others configutations like image, i can't swith on the machine the app is bloked and i can see in the escreen a arrows moving



My swith is usually open, it switch off in contact with the axis
Last edit: 04 Feb 2022 21:53 by Nest.

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05 Feb 2022 00:04 #233999 by PCW
Are the home switches normally open or normally closed?

If normally closed, you need to invert the home switch inputs

Also you have the EStop pin set as an output, this is not correct

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05 Feb 2022 00:25 #234000 by Nest
Are the home switches normally open or normally closed?
normally Open.

If I put the EStop like the switch the LinuxcNC is blocked 

How to fix it?

Thanks you so much

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05 Feb 2022 00:55 - 05 Feb 2022 00:56 #234006 by PCW
OK for normally open switches you don't need inversion.
The error means that when linuxCNC homing detected the home switch,
stopped and then wanted to back-off the switch, it was already open.

Can LinuxCNC overrun the closed switch position at home?
 If so, you probably need to change the home switch mechanics
or slow the home search velocity. so it cannot overrun the closed
switch position.

On a 7I96, You should not set any of the GPIO 0 through 11 to outputs
It sounds like you may need to invert the EStop input polarity
Last edit: 05 Feb 2022 00:56 by PCW.

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06 Feb 2022 09:01 #234087 by rodw

OK for normally open switches you don't need inversion.
Can LinuxCNC overrun the closed switch position at home?
If so, you probably need to change the home switch mechanics
or slow the home search velocity. so it cannot overrun the closed
switch position.


eg. the home switch MUST stay triggered all the way to the limit switch.

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06 Feb 2022 09:16 - 06 Feb 2022 09:17 #234089 by Clive S

eg. the home switch MUST stay triggered all the way to the limit switch.


I don't see any mention of limit switches

Last edit: 06 Feb 2022 09:17 by Clive S.

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06 Feb 2022 18:49 #234147 by Nest
My machine is small (300mm x 400mm x 55mm) and it only has three switches and I want them to be the home switches

what I have observed:
If I use normally open switches it doesn't work.

the box inv of the switches does is look for home or one side or other. does not work to set the switch open or closed

If I only put the X axis switch it works fine and it can only be normally closed, normally open it doesn't work. if i put other axis the switchs no work

I want is that there are only three switches at the start of the machine, and when I turn on the machine and press the home button, the machine will look for home and be ready to work
 

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06 Feb 2022 20:36 #234169 by PCW
Both normally open and normally closed switches will work
You need to invert the 7I96 inputs for normally closed switches.

_But_ the error you reported seems to indicate that the (normally open)
home switches closed and then re-opened unexpectedly. This most likely
indicates a mechanical or homing setup issue.

Note that this really has nothing to do with the 7I96 or pncconf

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