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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