Skip Function; G31 - Mitsubishi Electric MELDAS C6 Programming Manual

15. Measurement Support Functions

15.2 Skip function; G31

Function and purpose
When the skip signal is input externally during linear interpolation based on the G31 command, the
machine feed is stopped immediately, the remaining distance is discarded and the command in the
following block is executed.
Command format
G31 Xx Yy Zz αα Ff ; (where, a is the additional axis)
x, y, z, α
f
Linear interpolation can be executed using this function. If the skip signal is input externally while
this command is being executed, the machine will stop, the remaining commands will be canceled
and operation will be executed from the next block.
Detailed description
(1) If Ff is commanded as the feedrate in the same block as G31 command, commanded speed
"f" will apply; if it not commanded, the value set in the parameter "#1174 skip_F" will serve as
the feedrate. In either case, the F modal will not be updated.
(2) Normally, the machine will not automatically accelerate or decelerate with the G31 block.
However, setting the base specification parameter "#21101 add01/bit3" to "1" allows the
automatic acceleration/deceleration valid.
In such case, the acceleration/deceleration will apply following to the cutting feed
acceleration/deceleration pattern set with the axis specification parameter "#2003 smgst".
Since the deceleration at skip signal input follows the cutting feed acceleration/deceleration
pattern mentioned above, the coasting amount from the skip signal input to stop may be
larger than the normal specifications (when automatic acceleration/deceleration is invalid)
(3) The stop condition (such as feed hold, stroke end) is also valid for the G31 block.
(4) With the normal specifications, override and dry run are invalid during execution of G31 block.
However, setting the base specification parameter "#21101 add01/bit3" to "1" allows the
override and dry run.
(5) The G31 command is unmodal and so it needs to be commanded each time.
(6) If the skip signal is input during G31 command start, the G31 command will be completed
immediately.
When a skip signal has not been input until the G31 block completion, the G31 command will
also be completed upon completion of the movement commands.
(7) When the G31 command is issued during nose R compensation, program error (P608) will
result.
(8) When there is no F command in the G31 command and the parameter speed is also zero,
program error (P603) will result.
(9) If only the Z axis is commanded when the machine lock is ON or the Z axis cancel switch is
ON, the skip signal will be ignored and execution will continue as far as the end of the block.
: Axis coordinates; they are commanded as absolute or incremental
values according to the G90/G91 modal when commanded.
: Feedrate (mm/min)
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15.2 Skip function