Star Topology; Ring Topology - Danfoss iC7 Series Operating Manual

iC7 Series Modbus
Operating Guide
Installing drives of different current ratings in line topology may result in unwanted power-off behavior.
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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.

2.3.2 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.
Illustration 3: Example of Star Topology

2.3.3 Ring Topology

Ring topology enables the same simpler cabling and reduced cabling costs as line topology, but also reduces the damage caused
by a single cable failure in a similar manner as star topology.
The ring topology protocol depends on the protocol in use.
Modbus uses the parallel redundancy protocol (PRP). PRP is a layer 2 network protocol that enables a redundant topology in an
Ethernet network. PRP provides uninterrupted switchovers in failure situations, and is independent of the application.
For more information on configuring parallel redundancy protocol (PRP), see
20 | Danfoss A/S © 2023.09
N O T I C E
5.4 Configuring Parallel Redundancy
Overview
Protocol.
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