Shortest Response Time - Siemens Simatic S7-300 Technical Data Manual

Cycle and reaction times
5.3 Response time
5.3.2

Shortest response time

Conditions for the shortest response time
The figure below shows the conditions under which the shortest response time is reached.
Calculation
The (shortest) response time is the sum of:
Table 5-10
+
+
+
+
=
The result is equivalent to the sum of the cycle time plus the I/O delay times.
See also
Overview (Page 5-14)
5-16
CCP (OS)
PIO
Immediately before reading in the PII, the status of
the monitored input changes. This change of the input
PII
signal is still included in the PII.
User program
The change of the input signal is processed by
the application program.
CCP (OS)
The response of the user program to the change
of the input signal is issued to the outputs.
PIO
Formula: Shortest response time
1 x process image transfer time for the inputs
1 x process image transfer time for the outputs
1 x program processing time
1 × operating system processing time at the SCC
I/O delay
Shortest response time
Delay of inputs
Delay of outputs
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05