
5.AUTOMATIC OPERATION B-63783EN-1/01
- 522 -
5.11 ACTIVE BLOCK CANCEL
General
Automatic operation can be stopped by inputting block cancel signal
BCAN into the control unit during automatic operation. After
automatic operation has been halted, automatic operation starting
signal STL and automatic operation in progress signal OP also go to 0.
All modal information is stored.
This operation accompanies the following:
1) If the machine was performing a movement, the movement is
decelerated to a stop. The remaining amount of travel is cancelled.
2) If the machine was in the dwell status, the dwell command is
cancelled.
3) If the miscellaneous function, spindle function, tool function, or
second miscellaneous function was in progress, corresponding
strobe signal MF, SF, TF, or BF goes to 0, and the block
terminates. If a high-speed M/S/T/B interface is used, strobe
signal MF, SF, TF, or BF does not change its status, but the block
terminates. Accordingly, completion signal MFIN, SFIN, TFIN,
or BFIN must be set to the same logic level as the strobe signal
before the operation is resumed.
When a cycle start is made, automatic operation is resumed from the
block immediately after the cancelled block.
- Resumed operation
G90/G91
When an operation is resumed, the command for the block after the
cancelled block determines the operation to be resumed. If the block
has an absolute command, the operation is resumed from the position at
which it was stopped and made toward the end point of the next block.
If the block has an incremental command, the operation is resumed
from the position at which it was stopped and performed in incremental
mode.
Next block
Programmed path
When the next
block contains
G90
When the next
block contains
G91
Position where the operation
was stopped by signal input
Fig. 5.11 (a) G90/G91