Functions
5.5 Intelligent DP slaves (I-slaves)
PROFIBUS with STEP 7 V13
Function Manual, 12/2014, A5E03775446-AC
81
Data exchange with higher-level DP master
Introduction
The following section describes the data exchange between the I-slave and the higher-level
DP master.
Transfer areas are an interface to the user program of the I-slave CPU. Inputs are processed
in the user program and outputs are the result of the processing in the user program.
The data for communication between DP master and I-slave is made available in the transfer
areas. A transfer area contains an information unit that is exchanged consistently, in terms of
bytes, words or overall, between DP master and I-slave. You can find more information on
configuration and use of transfer areas in the section Configuring transfer areas (Page 84).
The following figure shows the data exchange between the I-slave and the higher-level DP
master. The individual communication relations are explained below based on the numbers.
Figure 5-14 Data exchange with the DP master
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