Cycle Time; Different Cycle Times - Siemens Simatic S7-1500 Function Manual

Cyclic program execution

3.2 Cycle time

3.2 Cycle time
Definition of cycle time
The cycle time is the time the CPU needs for:
● Updating the process image inputs/outputs
● Executing the cyclic program
● All program parts and system activities interrupting this cycle
● Waiting for the minimum cycle time (if it is parameterized and is longer than the program
execution time)
3.2.1

Different cycle times

Introduction
The cycle time (T
Causes of this include:
● For example, different program runtimes:
– Program loops
– Conditional commands
– Conditional block calls
– Different program paths
● Lengthening due to interruptions, for example:
– Time-driven interrupt processing
– Event-driven interrupt processing
– Communication
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) is not the same in each cycle because the processing times may vary.
cyc
Cycle and response times
Function Manual, 10/2018, A5E03461504-AD