So lets assume the tool change process resulted in an error, or a TC
abort button was pressed.
What would you expect to happen in EMC?
i think EMC should react in a safe and predictable way like it does with
all error codes to date.
a program stop/abourt is nice that then places EMC back into manual mode
with a error up saying tool change abourted or something
as from looking at it i dont think machine needs to be placed into a
machine off state for this error.
this would allow the user to then use a PYVCP panel, or real buttons or
even Mcodes to get out of the error or move the machine etc, as some
machines need to move the Z axis up to do a tool change
our CNCs have an array of Mcodes built in that will let you do a tool
change sequence from start to finish, and u can issue these only from a
MDI command. so this lets you reset the tool arm or carousel, then u can
search the program for the tool change location and run from that line ...
some machines i have used have had a secrute switch behind the panel
that lets you move one station at a time on the turret as this was on a
lathe. did the turret up and next station with switch on, and off it did
a lockdown, again u had to be in a set mode for this to work.
but this is more to the intergrator i feel, the same way i think EMC
will recived a tool change abourt signal..
What I can imagine is passing through more information to the EMC
level, namely wether it was a tool-prepare or a change, what the
tool/pocket number was, and how it was aborted (user, machine). That
could be passed to say an Axis message describing what happened. But
other than that, the tools at hand at this point are really what I
described in the previous paragraph.
tool prep error would be handy so on a random, if u cant find a tool #
for what ever reason u can abourt safly before a m06 is even throught
about.
but here do you want to abourt the program? as on a random u will be
down in the job running Gcode, while getting the next tool ready.
so maybe abourt at the m06 command using the same tool-about path as
above but a error message that says tool-prep error
what todo with a changed or not changed tool number state is tricky
some controls i'v seen asume it has change the tool from pocket to
the spindle, i think you have to say, what does someone do in a
power cut while in a tool change right now?! answer is problem same
for here...
other dont and still think the old tool is there.
Ok, that sounds exotic, but I could imagine that EMC dealt with
powerfail in a more configurable way beyond just restarting in e-stop
mode; for instance, trying to save essential machine state if a
powerdown is pending, and deal with it in a controllable way if power
comes back up. Linux has fairly basic support for dealing with
powerfail and recovery in a controlled way provided there's some power
backup to at least permit a controlled shutdown, and that mechanism
could be built upon.
what i ment here was what does machine do on a power stop or estop not
how does EMC or linux machine react turning off is fine what whats
machine do in a tool change.. the user has to power back up and reset
the tool changer or what ever i know but its same route he/she has to
take as to what the tool-abourt is going to do in away.. this is how i
ment this to come over.
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