Configuration Options
3-27
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
3.6 Direct data exchange on the PROFIBUS DP
Prerequisites
• The ET 200S can be used as the sender (publisher) for direct communication.
• The DP master being used must, of course, also support direct communication.
You will find information on this in the description of the DP master.
Principle
Direct communication is characterized by the fact that PROFIBUS DP nodes
monitor the data sent back by a DP slave to its DP master.
By means of this mechanism the monitoring node (recipient/subscriber) can
directly access changes to the input data of remote DP slaves.
During configuration in STEP 7 you specify by means of the relevant I/O input
addresses the address area of the recipient in which the data of the sender is to be
placed.
Example
Figure 3-5 gives an example of the direct-communication relationships you can
configure with an ET 200S as the sender and which nodes as possible recipients
can monitor data sent back by DP slaves to the DP master.
PROFIBUS
CPU 31x-2 as
DP master 1
CPU 31x-2
DP slave
DP master
system 1
DP master
system 2
CPU 31x-2 as
DP master 2
CPU 31x
-
2
as
DP slave
ET 200S
ET 200S
ET 200S
Figure 3-5 Direct Communication with the IM151-1 HIGH FEATURE
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