Siemens SIMATIC ET 200M Operating Instructions Manual page 184

Functions
8.8 Direct data exchange
8.8 Direct data exchange
As of
IM 153-x interface modules can take part in the direct data exchange as a sender
(publisher).
Principle
Direct communication is characterized by the fact that the PROFIBUS DP subscribers "listen
in" to find out which data a DP slave is sending back to its DP master.
This mechanism allows the "listening node" (recipient) direct access to deltas of input data of
remote DP slaves.
During configuration in
address area of the receiver where the sender's data are to be read.
Example
The figure below gives an example of the direct data exchange relationships you can
configure with an ET 200M as the sender and the nodes that can "listen in" as possible
receivers.
Figure 8-24
Note
The interface module IM 153-2 supports as of 6ES7153-2BA01-0XB0, firmware version
V4.0.0, the safety related I-Slave-Slave-Communication via PROFIBUS DP for the fail-safe
module. For information on this functions, refer to the "S7 distributed safety, configuring and
programming (http://support.automation.siemens.com/WW/view/en/22099875)" manual.
182
STEP 7
V 5.0 you can configure direct communication for the PROFIBUS nodes. The
STEP 7
Direct data exchange with the IM 153-x
, you use the respective I/O input addresses to specify the
Operating Instructions, 12/2008, EWA-4NEB780600602-08
ET 200M