Cycle and Response Times
7-2
ET 200S Interface Module IM 151/CPU
A5E00058783-01
7.1
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 7-1
Process image transfer time (PII and
PIQ)
See Table 7-2
User program execution time
Is calculated from the execution times of the
individual instructions and a CPU-specific factor
(see Table 7-3).
S7 timers
See Table 7-4
Loading through interrupts
See Table 7-5
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 7-1
Component Parts of the Cycle Time
Summary of Contents for SIMATIC IM 151/CPU
Page 6: ...Important Information vi ET 200S Interface Module IM 151 CPU A5E00058783 01 ...
Page 14: ...Contents xiv ET 200S Interface Module IM 151 CPU A5E00058783 01 ...
Page 42: ...ET 200S in the PROFIBUS Network 3 12 ET 200S Interface Module IM 151 CPU A5E00058783 01 ...
Page 68: ...Commissioning and Diagnostics 4 26 ET 200S Interface Module IM 151 CPU A5E00058783 01 ...
Page 98: ...Technical Specifications 6 8 ET 200S Interface Module IM 151 CPU A5E00058783 01 ...
Page 108: ...Cycle and Response Times 7 10 ET 200S Interface Module IM 151 CPU A5E00058783 01 ...
Page 190: ...Execution Times of the SFCs and SFBs C 4 ET 200S Interface Module IM 151 CPU A5E00058783 01 ...
Page 196: ...Migration of the IM 151 CPU D 6 ET 200S Interface Module IM 151 CPU A5E00058783 01 ...