Configuring Hardware and Communication Connections STEP 7.pdf

Configuring the Distributed I/O (DP)
Function
Prior to displaying the topology, the "Prepare line diagnostics" function must be
called initially after each modification of the hardware structure, in order to enable
the diagnostic repeater to measure the PROFIBUS subnet and generate internal
distance tables.
The "Display the PROFIBUS Network Topology" function is used to visualize these
data.
If you select a subnet in a opened project and then display the topology, the nodes
in the subnet are displayed along with their configured names.
In addition to the visualization, the entries in the diagnostics buffer of the diagnostic
repeater as well as statistical data can be read and displayed.
You can write these data to a file and print it.
Requirements
The diagnostic repeaters must support the "Display the PROFIBUS Network
Topology" function (i.e. as of order no. 6ES7 972-0AB01).
The structure of the PROFIBUS network must be in compliance with the guidelines
in the diagnostic repeater manual, to be able to determine distances correctly.
Cascaded diagnostic repeaters, for example, may only be connected to a master
diagnostic repeater via a DP1 interface.
To call the "Prepare line diagnostics" function, the PG must be connected directly
to the same PROFIBUS as the diagnose repeater. The "Prepare line diagnostics"
function can also be called without open project.
To enable the "Display the PROFIBUS Network Topology" function, you can also
connect the PROFIBUS network with its diagnostic repeaters via a "Data record
router" (z. B. CP 443-5 Ext V3.2) to the PG. The PG must have been assigned in
the STEP 7 project (Under NetPro, use menu command PLC > Assign PG/PC to
configure the "PG/PC" object). To enable the display of a network topology via
routed diagnostic repeater, you need to open the corresponding project and select
the participating PROFIBUS subnet.
Procedure
Do one of the following:
1. In NetPro or in HW Config, select the menu command PLC > Prepare Line
Diagnostics.
2. In the SIMATIC Manager, select the menu command PLC > PROFIBUS >
Display Network Topology; or in NetPro, select the menu command PLC >
Display PROFIBUS Topology.
Alternative: In the user program, use SFC 103 ("DP_TOPOL") to determine the
topology.
Configuring Hardware and Communication Connections with STEP 7
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