Mesa 7i76 invert input pin

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kibo
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30 Nov 2017 14:59 #102534 by kibo

Mesa 7i76 invert input pin was created by kibo

Hi
I use Mesa 7i76 and limit switches in Normally closed wiring = when I start machine all switches are closed.

I would like to invert pin in HAL config file.
In file configs/custom.hal a wrote:

setp hm2_5i25.0.7i76.0.0.input-00.invert_output true

but it does not work.

hm2_5i25.0.7i76.0.0.input-00 is the pin connected to min-x switch

Could you please help me? I am sorry I am beginer with LinuxCNC.

Thanks a lot.

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Todd Zuercher
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30 Nov 2017 15:05 #102535 by Todd Zuercher

Replied by Todd Zuercher on topic Mesa 7i76 invert input pin

For the inputs on your 7i76 use the pin

hm2_5i25.0.7i76.0.0.input-00-not

for the inverted state. (that is inplace of the regular input pin.)

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kibo
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01 Dec 2017 07:48 #102553 by kibo

Replied by kibo on topic Mesa 7i76 invert input pin

Thanks a lot.

because I got an error on:

setp hm2_5i25.0.7i76.0.0.input-00-not true

pin 'hm2_5i25.0.7i76.0.0.input-00-not' is not writable

I wrote to custom.hal:

# --- MIN-X ---
unlinkp hm2_5i25.0.7i76.0.0.input-00
net min-x     <=  hm2_5i25.0.7i76.0.0.input-00-not

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bevins
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01 Dec 2017 12:12 #102558 by bevins

Replied by bevins on topic Mesa 7i76 invert input pin

Just curious, why would you want to logiscally have a critical input change state in software if you can even do that?

Why not create an output and tie it across the input and control the output with software. I do that to get by a limit switch during tool change. But I have another down the line for security also.

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andypugh
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06 Dec 2017 17:02 #102724 by andypugh

Replied by andypugh on topic Mesa 7i76 invert input pin

kibo wrote:

I wrote to custom.hal:

# --- MIN-X ---
unlinkp hm2_5i25.0.7i76.0.0.input-00
net min-x     <=  hm2_5i25.0.7i76.0.0.input-00-not

It is probably better to simply connect the correct pin in the normal HAL and accept that you won't be using Stepconf/PnCConf again, or run the wizard and invert it there.

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BigJohnT
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07 Dec 2017 12:10 #102737 by BigJohnT

Replied by BigJohnT on topic Mesa 7i76 invert input pin

Instead of guessing at pin names get a list of all pins like this

To get a list of all the Mesa pins make sure field power is on then open
a terminal and do the following. ~$ and halcmd: are not to be typed they
are the terminal prompts. If you add a config to the hm2_pci line it will
change the pins that show up.

~$ halrun
halcmd: loadrt hostmot2
halcmd: loadrt hm2_pci
halcmd: show pin > pins.txt

JT

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