Change the axis limit

Hello, 
Can I change the axis limits, maximum speed and ramp with the variable addresses I wrote in the G-code file or with classicladder without entering the ini file?
For example :
eg.ngc
℅ 
#100 = 1000 (x-axis positive limit) 
#101 = 200 (ramp) 
m2
℅
Or can I do it with the Classic Ladder?

The short answer is, yes, you can change axis limits through HAL connections as well as through GCODE but there are a few things you need to be aware of.

- Axis limits are exposed as hal pins only after the GUI has started up. So any hal connections would need to be made in the POSTGUI_HALFILE
linuxcnc.org/docs/html/gcode/overview.html#gcode:ini-hal-params
As stated in the documentation #<_ini[section]key> parameters are read_only so if you want to change the value from Gcode you have to use a custom Mcode that uses a script language (eg tcl or bash) to execute a 'halcmd'

- Changes to ini parameters during GCODE execution will only become effective AFTER a quebuster command (eg M66 E0 L0)

My usual solution to change ini parameters from GCode is this:

1. save this bash script as 'M123' to a folder named 'mcodes' in your machine config folder and mark as executable:

To make sure that the changes are actually used we call the above script from a GCODE subroutine.

2. Save the following code as 'm123_wrapper.ngc' and save to a folder in your [RS274NGC]
SUBROUTINE_PATH

To make linuxcnc aware of these mcodes add these lines to the [RS274NGC] section of your ini file
Note 'argspec=PQ' will enforce that the 'M423' command is followed by a 'P' word containing the code for which axis [X(1),Y(2)] and which limit [min (1), max(2)] should be changed and a 'Q' word containing the limit value.
example usage:will set 'ini.x.max_limit' to '401'


The parameter handling can be changed to your specific requirements in the 'case' part of the bash script above.

Thanks to you, many of my problems were solved. Thank you very much for your help. You are truly an expert.

I cannot find the limits I marked in the picture on halshow.
When I change the limits below joint_0, the machine stops at the limit, but I cannot move it again with the jog keys.


 

You are looking at 'ini.0.' values. Those correspond to the [JOINT_0] section in the ini file. If you want to see the [AXIS_X] values you would need to navigate to 'ini.x.' which should be lower down in the list on the left hand side of the screen shot.

You're right, I found it, thanks a lot