Technical data

Table Of Contents
PROFInet
System Software for S7-300/400 System and Standard Functions - Volume 1/2
17-2
A5E00709327-01
Updating the PROFInet Interface
The data consistency provided by the use of the shadow memory means that
updating the PROFInet interface takes place in the following two steps:
The inputs in the shadow memory interface DB are copied to the inputs before
your program for the PROFInet component starts
The outputs of the interface DB are copied to the outputs of the shadow
memory after your program for the PROFInet component has run
The PROFInet interface is updated by either the operating system or by means of
SFCs 112 and 113, depending on how you configured the PROFInet component in
the SIMATIC Manager. The following illustration shows a diagram of the update
done by means of SFCs 112 and 113.
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The system-side update always occurs at the scan cycle check point.