Star Topology - Danfoss iC7-Hybrid PROFINET Operating Manual

Operating Guide | iC7-Hybrid PROFINET
When line topology is used, take precautions to avoid timeout in the PLC when more than 8 drives or power converters are
installed in series. Each drive or power converter in the network adds a small delay to the communication due to the built-in
Ethernet switch. When the update time is too short, the delay can lead to a timeout in the PLC.
Set the update time as shown in the table. The numbers given are typical values and can vary from installation to installation.
l
Number of units connected in series
<8
8–16
16–32
33–50
>50
NOTE: Using tools such as MyDrive® Insight may influence system performance in a line topology.
Figure 2: Example of Line Topology
Installing drives or power converters of different current ratings in line topology may result in unwanted power-off behavior.
Mount the drives or power converters with the longest discharge time first in the line topology. In normal operation, the
l
drives or power converters with bigger current ratings have a longer discharge time.

Star Topology

2.6.3
In a star network, all devices are connected to the same switch or switches. Star topology reduces the damage caused by a single cable
failure. In a star topology, a single cable failure affects a single device instead of all devices in the network. In many applications, this
topology enables simpler cabling depending on the location and distance of the device.
Danfoss Drives Oy © 2024.04
NOTICE
Minimum update time [ms]
2
4
8
16
Not recommended
NOTICE
AQ481922002453en-000101 / 172K4283A |
15