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PROFIBUS-DP Master DTM
Section 3-3
Bus Parameters Tab The Bus Parameters tab contains the parameters for the communication on
the PROFIBUS network. The Bus Parameters tab is shown below.
The Bus Parameters are a number of settings which define the communica-
tion behavior and timing on the PROFIBUS network. The Bus Parameters
depend on the selected baud rate, certain slave communication parameters
as well as the number of I/O data bytes exchanged between the Master Unit
and each of the slave stations.
The required combination of Bus Parameters is calculated by the program,
based on the dependencies mentioned above. However, the user can change
selected Bus Parameter manually if the application requires this.
!Caution Changing the calculated Bus Parameters manually is not recommended, and
should only be performed if this is really necessary. Changing the Bus Param-
eters to an invalid combination, may result in Unit malfunctioning and unex-
pected behavior.
Note When making changes to certain Bus Parameters, selecting the Optimize but-
tons, allows toggling between the optimized values and the changed values.
Selecting an other baud rate after changing certain parameters, will reset the
Bus Parameters to default values for the new baud rate.
Control Description
Auto-CLEAR Mode ON Selected Unit transitions to the CLEAR mode in the event
of a network error, e.g. because one or more configured
slaves are not in the Data Exchange mode.
Auto-CLEAR Mode OFF
(default setting)
Selected Unit does not transition to CLEAR mode, but
attempts to re-parameterize the slave station.
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