Calculating Method For Calculating The Cycle/Response Time - Siemens CPU 31 Series Technical Data Manual

Cycle and reaction times

5.4 Calculating method for calculating the cycle/response time

5.4 Calculating method for calculating the cycle/response time
5.4
Introduction
This section gives you an overview of how to calculate the cycle/response time.
Cycle time
1. Determine the user program runtime with the help of the
2. Multiply the calculated value by the CPU-specific factor from the table
3. Calculate and add the process image transfer time. Corresponding guide values are
4. Add the processing time at the scan cycle checkpoint. Corresponding guide values are
5. Include the extensions as a result of testing and commissioning functions as well as
Extension of the cycle time as a result of interrupts and communication load
100 / (100 – configured communication load in %)
1. Multiply the cycle time by the factor as in the formula above.
2. Calculate the runtime of interrupt processing program sections with the help of the
3. Multiply both values by the CPU-specific extension factor of the user program processing
4. Add the value of the interrupt-processing program sequences to the theoretical cycle
See also
Cycle extension through Component Based Automation (CBA) (Page 5-10)
5-18
program processing time
Data for calculating process image transfer time
found in table
Operating system processing time at the scan cycle checkpoint
found in the table
cyclical PROFINET interconnections in your calculation. These values are found in the
Cycle time extension due to testing and commissioning functions.
table
the cycle time.
instruction list. Add the corresponding value from the table below
time.
time, multiplied by the number of triggering (or expected) interrupt events within the cycle
time. The result is an approximation of the physical cycle time. Note down the result.
.
Instruction list
.
Extension of user
.
The final result is
.
CPU 31xC and CPU 31x, Technical Data
Manual, 01/2006 Edition, A5E00105475-06
.