Star Topology - Danfoss iC7 Series Operating Manual

iC7 Series PROFINET
Operating Guide
When line topology is used, take precautions to avoid timeout in the PLC when more than 8 drives are installed in series. Each
drive 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.
-
Number of drives connected in series
<8
8–16
16–32
33–50
>50
Using tools such as MyDrive
Illustration 3: Example of Line Topology
Installing drives of different current ratings in line topology may result in unwanted power-off behavior.
-
Mount the drives with the longest discharge time first in the line topology. In normal operation, the drives with bigger cur-
rent ratings have a longer discharge time.

2.6.2 Star Topology

In a star network, all devices are connected to the same switch or switches. Star topology reduces the damage caused by single
cable failure. In a star topology, a single cable failure affects a single drive instead of all drives. In many applications, this topology
enables simpler cabling depending on the location and distance of the device.
Danfoss A/S © 2023.06
N O T I C E
N O T I C E
Insight may influence system performance in a line topology.
®
N O T I C E
Minimum update time [ms]
2
4
8
16
Not recommended
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