Cycle and Reaction times
3-3
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Extending the Cycle Time
Note that the cycle time of a user program is extended by the following:
Time-controlled interrupt handling
process interrupt processing (also refer to Chapter 3.4)
Diagnostics and error handling (see also Section 3.4)
Communication via MPI
3.2 Response Time
Response Time – A Definition
The response time is the time between detection of an input signal and
modification of an associated output signal.
Factors
The response time depends on the cycle time and the following factors:
Factors Remarks
Delay of the inputs and outputs The delay times are given in the technical specifications
In the Module Specifications Reference Manual for the
signal modules
In Chapter1.4.1 for the integrated I/O of the CPU 312
IFM.
In Chapter1.4.4 for the integrated inputs/outputs of the
CPU 314 IFM.
Additional bus runtimes on the PROFIBUS
subnet
CPU 31x-2 DP only
Range of Fluctuation
The actual response time lies between a shortest and a longest response time.
You must always reckon on the longest response time when configuring your
system.
The shortest and longest response times are considered below to let you get an
idea of the width of fluctuation of the response time.
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