Functions; Direct Data Exchange On Profibus Dp - Siemens SIMATIC ET 200S Operating Instructions Manual

Functions

7.1

Direct data exchange on PROFIBUS DP

Introduction
The ET 200S can be used as the sender (publisher) for the direct exchange of data (cross
traffic). Naturally, the DP master used must also support direct data exchange. You will find
information on this in the description of the DP master.
General procedure
Direct data exchange (cross traffic) is characterized by PROFIBUS DP nodes which "listen"
on the bus and know which data a DP slave returns to its DP master. This mechanism allows
the "listener" (recipient / subscriber) direct access to modified input data from the remote DP
slaves.
During configuration in
address space of the recipient where the sender data is stored.
ET 200S
Operating Instructions, 08/2008, A5E00515771-06
STEP 7
the respective I/O input addresses are used to specify the
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