Event-driven program execution
4.2 Process response time when program execution is event-driven
Cycle and response times
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You can find these times in the tables in the section "Extension due to nesting of higher-
priority OBs and/or interrupts" in the chapter User program execution time (Page 31).
If you need fast interrupt response times, do not assign a process image partition to the
hardware interrupt OB and use direct access in the hardware interrupt OB.
You can find additional information on determining response times for PROFINET in the
application example with the entry ID 21869080 on the Service&Support
(http://support.automation.siemens.com/WW/view/en/21869080) Internet page.
Influence of input modules on the interrupt response times of hardware interrupts
Digital input modules:
Interrupt response time of hardware interrupts = internal interrupt processing time + input
delay (see section Technical specifications in the relevant manual)
Interrupt response time of hardware interrupts = internal interrupt processing
time + conversion time (see section Technical specifications in the relevant manual)
Impact of communication on interrupts
Communication tasks are always processed by the CPU with priority 15. If you do not want
the interrupt execution to be delayed or interrupted by communication, configure the interrupt
execution with priority > 15. The default setting for interrupt execution is priority 16.
Special consideration when PROFINET IO communication is configured on the 2nd PROFINET
interface (X2)
Additional information on this is available in section Special consideration when PROFINET
IO communication is configured on the 2nd PROFINET interface (X2) (Page 38).
Process response time when program execution is event-driven
When program execution is event-driven, the process response time is determined by the
following:
● Delay times of the input and output modules used
● Update times for PROFIBUS/PROFINET for distributed modules; update time of the
backplane bus for ET 200SP CPUs
● Interrupt response time of CPU
● Runtimes of the interrupt OB including update of the process image partition
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