Subroutine error

Im setting up my cnc which has a toolchanger but i have some weird issues that if the tool prepared and tool changed iocontrol hal pins goes high i get an error that line 0 would exeed the z axis / joint 2 limit. I have 2 machines running linuxcnc but still cannot seem to figure out the problem. Im very lost so any info would help. 


o<toolchange> sub

M73
G90
G53 G0 Z0
G0 X0 Y0

o100 if [EXISTS[#<_ini[traj]axes>]]
    #<geometry> = #<_ini[traj]axes>
o100 endif

o110 if [#<geometry> EQ 4]
    G0 A0
o110 else if [#<geometry> EQ 5]
    G0 A0 C0
o110 endif

o<toolchange> endsub [1]

M2
this sub is just as a test.  

Philip Lydin wrote:

G53 G0 Z0
 

Is Z=0 in machine coordinates inside the axis limits? If your soft-limit is at zero then possibly going to exactly zero triggers the error (I have a vague memory that this was a fixed bug, though). 

You could try setting max Z (or joint 2) to 0.01  (or whatever) then see if G53 Z0 still gives a fault. 
 

This line in the ini was the problem "TOOL_CHANGE_POSITION = 0 0 410". My z limit is 300....

Thanks for saying what the problem was, I will try to file that one away in my mental list of causes of tool change errors.

You might want to switch your Z axis round, so 0 is at the top and -300 at the bottom. Some CAM packages assume that G53 G0 Z0 is a safe retract.