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5 EtherCAT Communications
AC Servomotors/Servo Drives 1S-series with Built-in EtherCAT® Communications User’s Manual (I586)
5-9 C
able R
edun
dan
cy F
unct
ion
5
5-
9-4 Slave
Communicat
ions Statuses
Whe
n Cable Redund
ancy Fu
nction Is Used
This section takes the following example in which the cable redundancy function is used and a ring
topology is configured, and describes communications statuses during normal operation and in the ring
disconnection status. The configuration example contains three devices in the ring topology.
 Normal Status
All slaves are in communication.
 Ring Disconnection Status
Although the ring is broken between Slave C and D, all slaves continue communications.
Stop Device X to Z and then turn OFF the power supply to the EtherCAT master. Fix the ring discon-
nection status by replacing the cable, and then turn ON the power supply to the EtherCAT master
and to the devices, which returns the system to the normal communications status.
5-9-4 Slave Communications Statuses When Cable Redundancy Func-
tion Is Used
EtherCAT Master
Slave A
Junction Slave
Device X
Slave B
Slave C Slave D Slave F Slave G Slave E
Device Z Device Y
EtherCAT Master
Slave A
Junction Slave
Device X
Slave B
Slave C Slave D Slave F Slave G Slave E
Device Z Device Y
Open circuit