Siemens SIMATIC PCS 7 CPU 410-5H System Manual page 318

Supplementary information
15.15 Cycle and response times of the CPU 410-5H
Signal modules
The hardware interrupt response time of signal modules is made up as follows:
● Digital input modules
Hardware interrupt response time = internal interrupt processing time + input delay
You will find these times in the data sheet for the respective digital input module.
● Analog input modules
Hardware interrupt response time = internal interrupt processing time + conversion time
The internal interrupt processing time for analog input modules can be neglected. The
conversion times can be found in the data sheet for the individual analog input modules.
The diagnostic interrupt response time of the signal modules is the time from detection of a
diagnostic event by the signal module to the triggering of the diagnostic interrupt by the
signal module. This short time can be neglected.
Hardware interrupt processing
Hardware interrupt processing begins when the hardware interrupt OB 4x is called. Higher-
priority interrupts stop hardware interrupt processing. Direct access to I/O modules is
executed during the execution time of the operation. After the hardware interrupt has been
processed, the system either resumes cyclic program processing, or calls and processes
interrupt OBs of the same or lower priority.
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CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB