Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 736)

Program Interrupt
Chapter 29
29-6
Type 1 Interrupts
If the Interrupt Program: Then the Control:
Does not generate axis motion executes the interrupt program and then
continues executing the part program as
normal regardless of the location that
the interrupt program was executed.
Generates axis motion returns the tool to the endpoint of the
next fully unexecuted block and
continues executing the part program
from this point.
Figure 29.1
Type 1 Interrupt
Programmed Path
Path of Interrupt
This block is not
executed unless there
are no motion commands
in the interrupt
Return path
M99
M99
Motions due to
Delayed interrupt
Motions due to
Immediate Action
interrupt
Part program
path before
interrupt
Interrupt
occurs
CAUTION: If the interrupt is executed in the middle of a
block’s execution, and there is axis motion in the interrupt
program then the control will never reach the end point of the
interrupted block. Execution will transfer to the end point of
the following block. This applies to type 1 interrupts only.