User Variables Question

[Gerral]

I am working on converting programming from a different system to CNC12, and I have a question about user variables. From what I understand, the general-purpose user variables are #100-#149 and #29000-#31999. Variables #100-#149 are cleared at the beginning of each job, while variables #29000-#31999 persist until CNC12 is shut down.

I am performing calculations for one job that runs the probe for a specific product. The next job relies on the variables generated from the first job, which means I need to use variables in the range of #29000 to #31999. However, whenever I try to perform calculations using these variables, the program seems to freeze.

For example

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G0 X0 Y0 Z0
#100 = [#100 + 10]
G0 Z[#100]
#100 = [#100 + 10]
G0 Z[#100]

Increments the variable and moves the Z axis appropriately. Each time the job runs #100 is started back at 0.

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G0 X0 Y0 Z0
#30100 = [#30100 + 10]
G0 Z[#30100]
#30100 = [#30100 + 10]
G0 Z[#30100]

Locks up CNC12 entirely.
I was expecting it to work like the previous code but not resetting variable #30100 between runs.
What am I missing?

Thank you in advance for your comments

[Centroid_Jacob]

I can confirm this behavior with v5.22.
You can avoid the lock up by giving a starting value to #30100 before attempting to add 10 to it, but this is not ideal for repeat runs where you wouldn't want to reset the variable between jobs.

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G0 X0 Y0 Z0
#30100 = 0 ; initialize the variable before using to avoid lock up. 
#30100 = [#30100 + 10]
G0 Z[#30100]
#30100 = [#30100 + 10]
G0 Z[#30100]

Of interest is that lock up is avoided when the macro/job file checks if we're graphing or searching before the use of the variable, so it's likely related to one of those functions.

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IF #4201 || #4202 THEN GOTO 1000 ;Skip macro if graphing or searching

So this would work for the time being:

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IF #4201 || #4202 THEN GOTO 1000 ;Skip macro if graphing or searching
G0 X0 Y0 Z0
#30100 = [#30100 + 10]
G0 Z[#30100]
#30100 = [#30100 + 10]
G0 Z[#30100]
; rest of macro/job here
N1000 ; end of macro/job

[Gerral]

Thanks!

Using the value in #30100 from the previous job run, attempting to save to this variable also causes a freeze.

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#100 = #30100
#100 = [#100 + 10]
G0 Z[#100]
#100 = [#100 + 10]
G0 Z[#100]
#30100 = #100

Is this a bug that I need to report? I use a similar technique to run the same job over and over on an inlay grooving machine to slowly sneak up on the width of the inlay strip as they vary in width from strip to strip by as much as 1mm and the inlay grove has to be spot on.

[suntravel]

Try to use

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IF #4201 || #4202 THEN GOTO 1000 ;Skip macro if graphing or searching

in each job first and after this work with the variables.

Uwe

[Gerral]

That worked!
I've never used conditionals in GCode before as the previous system didn't support them.
When you suggested that I initially thought you were thinking I was working with a macro.

Thanks!!

[suntravel]

That worked!
I've never used conditionals in GCode before as the previous system didn't support them.
When you suggested that I initially thought you were thinking I was working with a macro.

Thanks!!

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IF #4201 == 0 && #4202 == 0 THEN #100 = #30100

should also work to not set a variable if graphing or searching for a single line instead of skipping a block or a macro with N1000 as the last block

Uwe