S01000$1 M03$1 These commands trigger error prompts.

[spxwh]

N00006 G00 X15.36 C132.6 S01000$1 M03$1
error:31 - Axis words found in block when no command or current modal state uses them.

S01000$1 M03$1
ok
error:25 - Repeated g-code word found in block.
M03$1 S01000$1
ok
error:25 - Repeated g-code word found in block.
These commands trigger error prompts. Per LinuxCNC official documentation, appending the $ modifier to both S and M03 in the same line should be valid syntax, and the documentation never prohibits writing S and M03 with $ tags on a single line.
thank you！

[terjeio]

Per LinuxCNC official documentation, appending the $ modifier to both S and M03 in the same line should be valid syntax

Where is that stated?

[terjeio]

From the linuxcnc source it seems there is only one $ value after parsing a block - so having multiple $-words in a block should be verified as valid on a linuxcnc installation. IMO if allowed I would expect that each command that allows a $-word would have its own instance of the $-value...

[spxwh]

Since I don’t have an in-depth understanding of LinuxCNC’s internal implementation, I can only learn about its multi-spindle functionality from content available on websites. I have reviewed the document at https://linuxcnc.org/docs/2.8/html/gcode/m-code.html several times, and it contains no mention of a rule prohibiting multiple $ symbols on a single line. It seems I will have to refer to the source code to fully grasp its syntax rules going forward. Thank you for your help.

[terjeio]

This is the general rule according to NIST RS274NGC:

3.3.5 Item Repeats
A line may have any number of G words, but two G words from the same modal group (see
Section 3.4) may not appear on the same line.
A line may have zero to four M words. Two M words from the same modal group may not appear
on the same line.
For all other legal letters, a line may have only one word beginning with that letter.

I will be surprised if the $-word is handled differently by LinuxCNC.