Longest Response Time - Siemens SIMATIC S7-300 Series Reference Manual

Longest Response Time

Figure 3-3 shows the conditions that result in the longest response time.
PII
Operating
system
User
program
PIO
PII
Operating
system
User
program
PIO
Figure 3-3 Longest Response Time
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Delay of the inputs + bus runtime on
the PROFIBUS-DP
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.
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.
Delay of the outputs + bus runtime on
the PROFIBUS-DP
Cycle and Reaction times
3-5