Siemens ET 7Y Series Spezifikationen Seite 171

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Cycle and Response Times
9-7
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
Longest response time
The following figure shows what the longest response time consists of.
Operating
system
User
program
PII
While the PII is being read in, the status of
the observed input changes. The change in
the input signal is no longer taken into
account in the PII.
PIQ
The change in the input signal is taken
account of in the PII here.
The change in the input signal is processed
by the user program here.
The response of the user program to the
input signal change is passed on to the
outputs here.
Response time
Delay of the inputs +
2 DP cycle time at the PROFIBUS-DP
Delay of the outputs +
2 DP cycle time at the PROFIBUS-DP
Operating
system
User
program
PII
PIQ
Figure 9-3 Longest response time
Calculation
The (longest) response time consists of the following:
2 process image transfer time for the inputs +
2 process image transfer time for the outputs +
2 operating system processing time +
2 program scanning time +
4 run time of the DP slave frame (incl. processing in the DP master) +
Delay of the inputs and outputs
This corresponds to the sum of 2x cycle time and delay of the inputs and outputs
plus 4x DP cycle time.
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