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The "Internode communication" function is described in detail in PROFIDrive
Profile, version 3.0.
Internode communication enables slaves to communicate directly with one another
instead of routing data indirectly via the DP master. This function can be utilized
only in conjunction with a DP master as "synchronizer" or an S7 CPU with
"equidistance" capability.
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Parameterizing master,
active station
Publisher
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Subscriber
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Subscriber
Inputs
Outputs
Internode communication relationships
Fig. 6-1
Principle of internode data communication on PROFIBUS-DP
The data are generated by the transmitter (Publisher) and received by one or
several receivers (Subscribers).
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All input data of a DP slave with internode communication capability constitute
transmit data with respect to internode exchanges. They can be received by the DP
master or by internode-capable DP slaves. ("Input data" in the context of
PROFIBUS-DP are data output by the DP slave in the direction of the DP master).
It is not necessary to configure internode communication transmitters explicitly.
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The sources for setpoints are parameterized. The following can be selected as
sources:
½
The output data of the DP master
½
The input data of a DP slave as an internode communication transmitter
(actual values in the case of drives).
Master output data and slave input data can be mixed as required (with word
granularity). ("Output data" in the context of PROFIBUS-DP are data which the DP
slave receives from the DP master).
Содержание Micromaster Profibus
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