Configuration Options with the ET 200M
3-26
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
3.10 Direct Communication
As of STEP 7 V 5.0 you can configure direct communication for the PROFIBUS
nodes. The IM 153-x can participate in direct communication as the sender
(publisher).
Principle
Direct communication is characterized by the fact that the PROFIBUS-DP nodes
listen in to find out which data a DP slave is sending back to its DP master.
Using this function the eavesdropper (recipient) can directly access changes in the
input data of remote DP slaves.
During configuration in STEP 7, in addition to defining the relevant I/O input
addresses, you can also define which of the recipient’s address areas the required
data from the sender will be read to.
Example
Figure 3-11 gives an example indicating which direct communication relationships
you can configure with an ET 200M as the sender and which nodes can listen in as
possible recipients.
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 200M ET 200M
ET 200M
Figure 3-11 Direct communication with the IM 153-x
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