Owner's manual

Program Interrupt
Chapter 29
29-7
Figure 29.2
Type 2 Interrupt
Programmed Path
Path of Interrupt
Interrupt
occurs
This block is not
executed unless there
are no motion commands
in the interrupt
Return path
Motions due to
Delayed interrupt
M
9
9
M
9
9
Return path
Motions due to
Immediate Action
interrupt
Part program
path before
interrupt
It is possible t o alter the number of blocks that the control re-executes in
reverse when returning to the start position of the interrupt. T he number of
return blocks is normally 4; however, it may be altered by programming
one of these M codes:
M900 - zero blocks retraced
M901 - one block retraced
M902 - two blocks retraced
M903 - three blocks retraced
M904 - four blocks retraced
These M codes may be programmed in any block in the main program that
is before the interrupt program is executed. They may also be programmed
within an interrupt though the M code will not go into effect until
execution is returned to the main program. If not programmed, the default
is 4 blocks. The default is automatically reset at the end of program
commands (M02 or M30).