OPERATION4. AUTOMATIC OPERATION
In automatic operation, a program is usually executed in the order that
commands are specified. This mode of execution is referred to as forward
movement. The retrace function can execute in reverse, program blocks
that have already been executed. This mode of execution is referred to as
reverse movement. In reverse movement, the tool can retrace the tool path
followed by forward movement.
A program can be executed in the reverse direction only for those blocks
that have already been executed in the forward direction.
Approximately 40 to 80 blocks can be executed in the reverse direction,
depending on the program.
During reverse movement, the REVERSE MOVEMENT LED is on and
RVRS blinks in the lower–right corner of the screen to indicate that the
tool is undergoing reverse movement.
The tool can perform reverse movement one block at a time when the
single block mode is set.
The tool can be moved again along the retraced path of the blocks in the
forward direction up to the block where reverse movement was started.
This movement is referred to as forward return movement. In forward
return movement, the tool moves along the same path as forward
movement up to the position where reverse movement started.
When the tool returns to the block where reverse movement was started,
the tool resumes forward movement according to the program.
In forward return movement, the REVERSE MOVEMENT LED is off
and RTRY (Re–TRY) blinks in the lower–right corner of the screen to
indicate that the tool is undergoing forward return movement. When the
tool switches from forward return movement to forward movement,
RTRY (Re–TRY) disappears from the lower–right corner of the screen.
The tool can perform forward return movement one block at a time when
the single block mode is set.
When there are no more blocks for which to perform reverse movement
(when the tool has moved back along the path of all memorized blocks
or the tool has not yet started forward movement), operation stops. This
is referred to as reverse movement completion.
Upon reverse movement completion, the REVERSE MOVEMENT LED
goes off, and RVED (ReVerse EnD) blinks in the lower–right corner of
the screen to indicate that reverse movement is completed.
Upon reset (when the RESET key on the MDI panel is pressed, the
external reset signal is applied, or the reset and rewind signal is applied),
the memorized reverse movement blocks are cleared.
A feedrate for reverse movement can be specified using parameter (No.
1414). When this parameter is set to 0, the feedrate used for forward
movement is used.
For forward return movement, the feedrate for forward movement is
In reverse movement and forward return movement, the feedrate override
function, rapid traverse override function, and dry run function are
D Forward movement and
D Forward return
D Reverse movement