Siemens SIMATIC CPU 410 System Manual page 374

Supplementary information
18.16 CPU 410 cycle and reaction times
Increasing the maximum interrupt response time with communication
The maximum interrupt response time is extended when the communication functions are
active. The additional time is calculated using the following formula:
CPU 410-5H t
where n = cycle load due to communication
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.
374
= 100 µs + 1000 µs × n%, significant extension possible
v
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC