Siemens CPU 410-5H Process Automation - Page 276

Supplementary information
16.15 Cycle and response times of the CPU 410-5H
CPU 410-5H Process Automation/CPU 410 SMART
276 System Manual, 10/2013, A5E32631667-AA
Extending the cycle time
The calculated cycle time of a S7-400H CPU must be multiplied by a CPU-specific factor.
The table below lists these factors:
Table 16- 12 Extending the cycle time
Startup
CPU 410-5H stand-alone mode
CPU 410-5H redundant
Factor
1.05
1.2
Long synchronization cables may increase cycle times. This extension can have the factor 2
- 5 with a cable length of 10 km.
Operating system execution time at the cycle control point
The table below shows the operating system execution time at the cycle checkpoint of the
CPUs.
Table 16- 13 Operating system execution time at the cycle control point
Sequence
CPU 410-5H stand-alone mode
CPU 410-5H redundant
Cycle control at the SCCP 25 - 330 µs
∅ 30 µs
120 - 600 µs
∅ 135 µs
Extended cycle time due to nested interrupts
Table 16- 14 Extended cycle time due to nested interrupts
CPU
Hardware
interrupt
Diagnostic
interrupt
Time-of-
day
interrupt
Delay interrupt
Cyclic
interrupt
Programming
error
I/O
access
error
Asynchro-
nous
error
CPU 410-5H
stand-alone
mode
75 µs 40 µs 50 µs 40 µs 40 µs 20 µs 20 µs 55 µs
CPU 410-5H
redundant
180 µs 70 µs 200 µs 120 µs 120 µs 90 µs 45 µs 130 µs
The program runtime at interrupt level must be added to this time extension.
If several interrupts are nested, their times must be added together.