3.1.5 Topology
The EtherCAT module features a built-in EtherCAT slave
controller, thus having two Ethernet RJ-45 connectors. This
module enables the possibility for connecting several
EtherCAT options in a line topology.
It is important in a EtherCAT system, that the connection is
done correctly. EtherCAT options has to be connected so
that a OUT port always connects to a IN port on the next
slave in the network. If this is not fulfilled the EtherCAT will
go into error mode.
NOTE
Do not connect any non-EtherCAT device to the last port
as this causes malfunction of the complete EtherCAT
network.
130BC178.10
Illustration 3.4 Line Topology
NOTE
In a line topology all frequency converters must be
powered, either by mains or by their 24 V DC option cards,
for the built-in EtherCAT slave controller to work.
Mounting frequency converters of different power-sizes in
a line topology can result in unwanted power-off behavior,
while using control word timeout (
8-02 Control Word
Source
to
8-06 Reset Control Word Timeout
. Mount the
frequency converters with the longest discharge time first
in the line topology.
How to Install
MCA 124 EtherCAT Operating Instruction
MG92A302 - VLT
®
is a registered Danfoss trademark
9
3
3
