Beckhoff EL6731 Documentation page 96

Parameterization and commissioning
5.1.6.3 TwinCAT "Box" tree
5.1.6.3.1 Profibus tab
Fig. 95: Profibus tab
Station no.
Here, the PROFIBUS station address must be set for each slave. For some slaves, the station address
cannot be set in the hardware, but only via the SetSlaveAddress service. In this case, the button "Set.."
should be pressed. This will open a dialog, through which transmission of a SetSlaveAddress telegram can
be triggered.
Watchdog
Activates the DP watchdog. If the slave does not receive a DP telegram for the duration of the watchdog time
with the watchdog switched on, it will automatically exit the data exchange. The minimum watchdog time to
be set depends on the DP cycle time, and should be larger than the value calculated by the following
formula: Estimated cycle time x 10
For particularly critical outputs it is possible to set a DP watchdog time down to as little as 2 ms for DP slaves
that support a watchdog base time of 1 ms (namely all Beckhoff slaves with the exception of the BK3000 and
BK3100, and any devices from other manufacturers whose GSD file contains the entry
"WD_Base_1ms_supp = 1"). The DP watchdog time should, however, be at least twice as long as the
greater of the Cycle time and the Estimated cycle time (see the master's tab).
Ident no.
Here, the Ident number from the GSD file is displayed.
Own PrmData
Allows editing of the Profibus-specific parameter data. The values of the current parameter data are also
displayed. The PrmData can usually be set as text (-> PrmData (text)) or for Beckhoff DP slaves partly via
the "Beckhoff" tab.
CfgData
The current configuration data (resulting from the attached modules or terminals) as well as their length is
displayed.
Sync/Freeze
In operation mode DP/MC (equidistant) of the master, slaves can be operated with Sync and Freeze [} 42].
96 Version: 2.8 EL6731