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Hello Todd,

As mentioned "If you do need to be able to activate it while a program is running there are other ways to skin this cat. (most involve doing what ever your M-code does directly without using the M-code.)"

What i want to achive is the change in accelaration on the fly, there is also similar talk on here , 

To check tooling quality in the middle of a difficult job, I need slow it down. I can slow the machine down using a feed rate of 1%, but the machine speed still stays around 3000 mm/min. I would like to be able to control acceleration in order to reduce the speed to slower speeds to check the tooling effect on single mm movements.

i am available if you require any further information on this.

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.