Mitsubishi Electric MELDAS 600M Series Instruction Manual page 97

F1-digit feed
Spiral interpolation
Reference point return/
return to start point
User macros
(Note)
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CHAPTER 1 SCREEN OPERATIONS
2. Monitor (Operation) Screens
Program
Function name
check
Reference point return and start
position return
The reference point return command and
return to start position command are
valid, but actual machine motion (trace
display) is partially different from the
drawing by program check.
As shown in the figure right, when
returning to the reference point via the
intermediate point with the G28 or G30
command, positioning to the
intermediate point is done by a straight
line and positioning from there to the
reference point is done by individual axes
independently.
With the G29 command, positioning to
the intermediate point is done by
individual axes independently.
Under program checking,
positioning is always done by a straight line even when returning via the intermediate
point; this may cause a little difference from the trace display.
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Remarks
See (Note).
Basic variable arithmetic operation and all check and
branch functions are effective. However, the following
functions are not effective:
• Macro interface input/output
• NC alarm
• Single block stop, miscellaneous function complete
signal, wait suppression
• Feed hold, feedrate override, G09 on/off
• Position information (The preceding block end point
coordinates are effective.)
If any one of the above commands is issued, it is ignored
or garbage data is input.
G53 Basic machine coordinate system
Move path in trace
mode (G29)
Move to
intermediate
point (G28)
Intermediate
point
however,
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#1
Reference point
First reference
return (G28)
point
Move path in trace
mode (G28)
Move to
intermediate point
(G29)
Position move with
G29 command