No.
Network Config-
uration Informa-
tion
Actual Configuration
EtherCAT Com-
munications
Status
Communications Status with a Ca-
ble Disconnected or Broken
1 Daisy chain and
branching topolo-
gy only
Daisy chain and branching
topology only (same as the
network configuration infor-
mation)
Normal status The communications status changes
to the minor fault status in which part
of the slaves can continue communi-
cations.
*1
2 Contains the ring topology Minor fault All slaves can continue communica-
tions.
Removing a cable added to the net-
work configuration information and
resetting the error returns the com-
munications status to the status of
No. 1.
3 Contains the ring
topology
Daisy chain and branching
topology only
Ring Disconnec-
tion Status
The communications status changes
to the minor fault status in which part
of the slaves can continue communi-
cations.
*1
4 Contains the ring topology
(same as the network con-
figuration information)
Normal status The communications status changes
to the ring disconnection status in
which all slaves can continue com-
munications. If a cable is disconnect-
ed or broken in this status, the status
changes to the minor fault status in
which part of the slaves can continue
communications.
*1
*1. If a minor fault occurs, slaves not separated from the EtherCAT master operate according to "Fail-soft
Operation Setting
" of the CPU Unit. Slaves separated from the EtherCA
T master cannot continue communi-
cations. Refer to the NJ/NX-series CPU Unit Built-in EtherCAT
®
Port User’s Manual (Cat. No. W505) for de-
tails on Fail-soft Operation Setting.
The following example shows a case of No. 4. In this example, the communications status changes
from the normal status to the ring disconnection status, and then the power supply to Device Y is
turned OFF
, which turns OFF the power supply to Slave C to E and causes a minor fault. Slave A, B,
F
, and G continue communications even after the minor fault occurs.
3 EtherCAT Communications
3-20
M1 Series EtherCAT Type User’s Manual (I670)
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