Siemens Simatic S7-300 Specifications Page 62

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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
5-2 A5E00105475-03
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This section explains what we mean by the term "cycle time", what this consists of
and how you can calculate it.
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The cycle time represents the time the operating system requires for processing
one program cycle, that is, one OB 1 cycle, including all program sections and
system activities that interrupt this cycle.
This time is monitored.
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Cyclic program processing, and therefore user program execution, is carried out in
time shares. To clarify these processes, let us assume that every time share has a
length of precisely 1 ms.
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During cyclic program processing, the CPU requires a consistent image of the
process signals. This is ensured by reading/writing the process signals prior to
program processing. Subsequently, during program execution and when
addressing input (I) and output (Q) address areas, the CPU does not directly
access the signal modules, but rather accesses the system memory area which
contains the I/O process image.
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