Topology: Star; Topology: Daisy Chain - Vacon optea Installation Manual

vacon • 18
4.4.1

Topology: Star

In star network, all the devices are connected to the same switch(es). This topology reduces the
damage caused by single cable failure. It would affect only to a single drive instead of them all. In
this setup, a drive will receive only broadcast/multicast messages and messages directed to this
drive.
Only one port from the option board can be connected to a switch in the star topology. Connecting
both ports to switch(es) will cause an involuntary Ethernet ring which, in this setup, will break the
network.
4.4.2

Topology: Daisy Chain

The daisy-chaining allows you to reduce the costs for cabling and networking equipment such as
switches. The maximum number of daisy-chained boards is 32. This restriction comes from the
average latency (20 to 40 microseconds) per Ethernet switch. The drawback in the daisy chain
topology is that it increases traffic in all except the last drive. The first drive in the daisy chain sees
all the traffic in the chain. Also damage to a single cable will drop all drives behind it from the
network.
Both in daisy chain topology and in star topology, the last drive's port must not be connected back
to the same line. This would cause an involuntary Ethernet ring which will break the network.
4
PLC 1
Power
DRIVE DRIVE
OPTE9-1 OPTE9-2
Figure 5. Star Topology
PLC
DRIVE DRIVE
OPTE9-1 OPTE9-2
Figure 6. Daisy chain topology
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
2 3 4 5 6 7
DRIVE DRIVE
...
OPTE9-3 OPTE9-8
11660_uk
DRIVE DRIVE
...
OPTE9-3 OPTE9-8
11597A_uk
Layout and connections
8