NETLink
®
Ethernet Products
In this way you avoid the laborious steps involved in manual
configuration, and most importantly ensure that profibus
networks work with many participants of the NETLink
®
with
the correct profibus parameters.
Under PROFIBUS, please note that the auto baud function works
best if the ‘Cyclic distribution of the bus parameters’ function is acti-
vated in the programmable controller used.
The screenshot above of a hardware configuration of a randomly
chosen PROFIBUS CPU shows where to find the switch for cyclic
distribution of the bus parameters.
Note regarding the Ttr
(Target Token Rotation
Time) parameter:
Make sure that the value
for the Ttr parameter is
not too small. If it is too
small, one of the ma
s-
ters on the bus may not
get enough time to send
data frames. The STEP
7 NetPro module has an
option that increases the
Ttr time every time a
master is added. Si
e-
l-
lowing recommended
calculation guideline for
custom profiles:
Minimum Ttr = 5000 x
HSA (highest station
address).
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