9
User Manual MN04200002E
Effective January 2016
C441 Ethernet module user manual
(C441R, C441T, C441U, C441V)
EATON www.eaton.com
Linear Network Connection
In a Linear network the number of external switch ports can be
reduce, or the external switch can be eliminated all together. The
figure below depicts three Motor Insight modules connected to a
PLC without any external switch.
Figure 6. Linear Network Connection Example
It does not matter which port (P1 or P2) is used for each connection
shown in the diagram
.
Ring Network Connection
Some PLC systems and external switches provide support for ring
network topologies. In these systems a closed ring is formed and
a special algorithm is used to allow communications to continue
even if a cable becomes disconnected or one of the ring devices is
removed.
Figure 7. Ring Network Connection Example
It does not matter which port (P1 or P2) is used for each connection
shown in the diagram.
P1
P2
P1
P2
P1
P2
PLC
P1
P2
P1
P2
P1
P2
PLC
(With
Ring
Support)
Two common ring algorithms are:
•
Rapid Spanning Tree Protocol (RSTP)
•
Device Level Ring (DLR)
While the Motor Insight does NOT directly execute these algorithms,
it has been designed to be included in these two types of rings. The
figure below depicts three Motor Insight units connected in a ring
with a PLC that supports a ring algorithm.
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