Sub-levels
The TIMED INTERRUPTS level contains several sub-levels to which
a specific program (OB) is assigned. Within the TIMED
INTERRUPTS level, the sub-levels have their own priority (refer to
the following table).
TIMED INTERRUPTS level
Sub-level Priority
Delayed interrupt
cyclic timed interrupt, shortest period
...
...
cyclic timed interrupt, longest period
time-driven interrupt
ascending
priority
(default)
Examples
Example of
"Execution by the system program":
At the CYCLE program execution level, the system program updates the
process image of the inputs and outputs, triggers the cycle monitoring time
and calls the PG interface management (system checkpoint).
Program Execution Levels
CPU 948 Programming Guide
C79000-G8576-C848-04
4 - 7
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