Cycle and Response Times of the S7-400
9.2 Cycle Time Calculation
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
9-5
Operating System Scan Time at the Scan Cycle Checkpoint
The table below lists the operating system scan times at the scan cycle checkpoint of the
CPUs.
*
In the case of I/O modules that are plugged into the central rack or an expansion rack,
the specified value contains the runtime of the I/O module
**
Measured with the IM 460-3 and IM 461-3 with a connection length of 100 m
***
The areas set in HW Config that are written once to the I/O or are read once from the I/O and are therefore consistent.
Table 9-4 Operating System Scan Time at the Scan Cycle Checkpoint
Process CPU 414 CPU 416
Scan cycle control at the SCC 160 µs to 239 µs
Ø 168 µs
104 µs to 163 µs
Ø 109 µs
Increase in cycle time by nesting interrupts
Table 9-5 Increase in cycle time by nesting interrupts
CPU Hardware
interrupt
Diagnostic
interrupt
Time-of-day
Interrupt
Time-delay
interrupt
Cyclic interrupt Programming /
PI/O
access error
CPU 414 314 µs 308 µs 237 µs 217 µs 210 µs 84 µs / 84 µs
CPU 416 213 µs 232 µs 139 µs 135 µs 141 µs 55 µs / 56 µs
You have to add the program execution time at the interrupt level to this increase.
If several interrupts are nested, their times must be added together.
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