Direct Data Exchange Via Profibus Dp - Siemens SIMATIC ET 200iSP Operating Instructions Manual

Configurations (principle)

4.9 Direct data exchange via PROFIBUS DP

4.9 Direct data exchange via PROFIBUS DP
Requirements
The ET 200iSP can be used as a sender (publisher) for direct data exchange (direct
communication). No configuration is required for this.
Of course the DP master used must support direct data exchange. Additional information can be
found in the description of the DP master.
Operating principle
Direct data exchange is also characterized by the fact that PROFIBUS DP devices "listen in" to
which data a DP device sends back to its DP master. By this mechanism the "listener" (receiver)
can directly access changes of input data of remote DP devices.
When configuring in STEP 7 you define, via the respective I/O input addresses, to which address
range of the receiver the desired data of the sender is to be read.
Example
The figure below shows an example of which direct data exchange "relations" you can configure
with a ET 200iSP as sender and which devices can "listen in" as possible receivers.
Figure 4-5
76
Example of direct data exchange
Operating Instructions, 11/2022, A5E00247483-AK
ET 200iSP