3, 8, or 16 Axis SERCOS interface Module 17
Publication
1756-IN572E-EN-P – March 2004
Ring Topology
The SERCOS network consists of a Master (1756-M03SE, 1756-M08SE, or
1756-M16SE module) and multiple drives connected in a ring topology.
The fiber optical ring starts and ends with the master.
The following diagram gives an example of a possible network connected in a
ring topology.
Figure 6 Ring topology with 1394C-SJTxx-D
Any break in the fiber optical ring disables the SERCOS network and creates
a warning that is identified by the SERCOS Ring Status LED.
ATTENTION
Each drive on the SERCOS ring must have a unique
SERCOS address. If two axes have the same address
on the same ring, both respond to commanded
motion. This could lead to damage to the equipment
or product and could result in personal injury.
P
O
WE
R
OK
Tx
Rx
SERCOS interface
Logix5550
RUN
rs232
BAT
I/O
OK
RUN REM PROG
Allen-Bradley PLCs
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