
B–61404E/08
4. AUTOMATIC OPERATIONOPERATION
435
Under any of the following conditions, P–type restart cannot be
performed:
⋅ When automatic operation has not been performed since the power
was turned on
⋅ When automatic operation has not been performed since an
emergency stop was released
⋅ When automatic operation has not been performed since the
coordinate system was changed or shifted (change in an external
offset from the workpiece reference point)
The block to be restarted need not be the block which was interrupted;
operation can restart with any block. When P–type restart is performed,
the restart block must use the same coordinate system as when operation
was interrupted.
When single block operation is ON during movement to the restart
position, operation stops every time the tool completes movement along
an axis. When operation is stopped in the single block mode, MDI
intervention cannot be performed.
During movement to the restart position, manual intervention can be used
to perform a return operation for an axis if it has not yet been performed
for the axis. A return operation cannot be done further on axes for which
a return has already been completed.
Never reset during the time from the start of a search at restart until
machining is restarted. Otherwise, restart must be performed again from
the first step.
Regardless of whether machining has started or not, manual operation
must be performed when the manual absolute mode is on.
If no absolute–position detector (absolute pulse coder) is provided, be
sure to perform reference position return after turning on the power and
before performing restart.
WARNING
As a rule, the tool cannot be returned to a correct position under the following conditions.
Special care must be taken in the following cases since none of them cause an alarm:
⋅ Manual operation is performed when the manual absolute mode is OFF.
⋅ Manual operation is performed when the machine is locked. (ignore the Z–axis)
⋅ When the mirror image is used.
⋅ When manual operation is performed in the course of axis movement for returning operation.
⋅ When the program restart is commanded for a block between the block for skip cutting and
subsequent absolute command block.
Restrictions
D P–type restart
D Restart block
D Single block
D Manual intervention
D Reset
D Manual absolute
D Reference position
return