Configuring Hardware and Communication Connections STEP 7.pdf

3.11.3 Working With the Topology View
Display of the Nodes
Configuring the Distributed I/O (DP)
The upper section of the "Topology display PROFIBUS DP" window shows the
nodes that cannot be assigned.
Representation Meaning
Nodes cannot be assigned.
The possible causes are indicated in a
message in the window:
Nodes have been added, node addresses
have been changed and afterwards the
function "Prepare Line Diagnostics" was not
started. If diagnostic repeaters are connected
that do not support the reading of topology
data, this is also reported in the upper section
of the window.
An unknown node is indicated by a series of
question marks.
The lower section of the window shows the nodes that can be assigned as
networked nodes along with the distance information determined not and, if
necessary, other information.
Representation Meaning
Nodes can be assigned and represented in the
PROFIBUS topology.
Other information such as a faulty
configuration (such as when the measuring
segments of two diagnostic repeaters are
directly connected) will be reported in a
message.
Representation of the cable lengths (in the
example):
The cable length between the DP slave with
the PROFIBUS address 2 and the diagnostic
repeater (PROFIBUS address 16) is 4 meters.
The DP slave is connected at segment DP2.
Node can be assigned, but cannot be reached
by the diagnostic repeater at this time.
Node can be assigned, but has been detected
as faulty by the diagnostic repeater
Configuring Hardware and Communication Connections with STEP 7
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