FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

OPERATION
4. AUTOMATIC OPERATION
B–62764EN/01
624
Cycle start
(forward movement started)
Feed hold stop
Reverse movement
signal=1,cycle start
Reverse movement
started
Forward return movement started
Forward movement started
Forward movement
Reverse movement
Forward return
movement
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 CRT 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 CRT 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 CRT
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 CRT screen to indicate that reverse movement is completed.
Explanations
D Forward movement and
reverse movement
D Forward return
movement
D Reverse movement
completion

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