Line Topology - Danfoss iC7 Series Operating Manual

iC7 Series Modbus
Operating Guide
The iC7 series communication interface has 2 Ethernet ports (X1 and X2) and an embedded switch with 2 Ethernet RJ45 connectors.
It has 1 MAC and IP address, and is considered a single device in the network. The communication interface supports 3 network
topologies:
•

Line topology

• Star topology
• Ring topology
2.3.1 Line Topology
In many applications, line topology enables simpler cabling and the use of fewer Ethernet switches. Observe network performance
and the number of devices in a line topology. Too many devices in a line may exceed network update time limits.
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 2: Example of Line Topology
Danfoss A/S © 2023.09
N O T I C E
N O T I C E
Insight may influence system performance in a line topology.
®
Minimum update time [ms]
2
4
8
16
Not recommended
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