Implement IO judgment in NGC files?

I've been having trouble writing G-code recently and was hoping someone could give me some hints.
I need to implement IO judgment in a .ngc file, such as the function of M66, but it can be implemented directly in G code
test.ngc: Is there a way to program it directly in the NGC file?

 

You can use this in a ngc file

thanks,MaHa
I have other little questions
How many pins can M66 define? I see in the documentation that there are 3 each for digital and analog signals, is there any way to expand this number?
Or how to combine this function with PLC?

You can increase the io using the "num_dio" parameter to the "loadrt motmod" command.

Depending on the structure of your HAL / INI files this might need to be done either as a change to the HAL file, or to a parameter read in to the HAL from the INI.

linuxcnc.org/docs/2.8/html/man/man9/motion.9.html

In checked my config, end of this line the amount of  analog and digital inputs are set, if you need more than available by default.

I have used this only from hal

Thanks ，andy, MaHa
I will try to expand the number of IOs.
I have a new question, I want to add PLC function, how can this PLC be used with M66?

A real PLC or a soft PLC (ie, ClassicLadder)?

I think that you would connect the PLC inputs and outputs to the same motion pins that you are already using, in the HAL layer.

linuxcnc.org/docs/2.8/html/ladder/ladder-intro.html