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Cycle and Response Times
9-2
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
9.1 Cycle time
Cycle time a definition
The cycle time is the time that the operating system requires to process a program
cycle – i.e. an OB 1 cycle as well as all the program sections and system
activities interrupting this cycle.
This time is monitored.
Components of the cycle time
Factors Remarks
Operating system execution time See Table 9-1
Process image transfer time (PII and
PIQ)
See Table 9-2
User program execution time Is calculated from the execution times of the
individual instructions and a CPU-specific factor
(see Table 9-3).
Loading through interrupts See Table 9-4
The following figure shows the components that make up the cycle time:
PII
Operating
system
Cyclic user program
(OB 1)
PIQ
Interrupts
Operating
system
Acyclic user
program (e.g. OB
40/82)
Figure 9-1 Component parts of the cycle time
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