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The error pins are optional and need to be set in the 'loadrt modmod .....' line in the hal file using, for example, 'num_misc_error=2' which should give you two error pins:
linuxcnc.org/docs/stable/html/man/man9/motion.9.html

Hello,
I have created HAL configuration as explained by mjohnston, with a single pushbutton. The functionality is that when I push and hold the button, the acceleration of all axes must be set to 10% of their actual values. However, my application is different. I'm not using M-Codes.

I found that this change of acceleration works for me, but it has a very deviated output. The button press effect occurs after a large lag in time, and the amount of time varies for different programs.

More digging with debugging tools revealed that the trajectory planner has buffered lines. When I press the button, the acceleration change works after the previous buffered lines are executed. Also, the button release event has this lag, as well.

So, my question is: Is there any way to make this acceleration change happen immediately upon button press or release? Or, is there any way to change the buffer size in the trajectory planner?

I am available if you need any more information on this.

  Hello Aciera,

thanks for your reply.
I see the difference. In my machine the motion.misc-error-00 i see only as signal, not as pin like in your picture.
It is not in my pin-list and i see in the documentation that it is not standard-list (linuxcnc.org/docs/stable/html/config/core-components.html).

In which way can i get this pin? (Sorry, it's my first machine with LinuxCNC).

Thanks
Michael