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• If the

Fail-soft Operation Setting

is set to

Stop

, process data communications will stop for all

slaves when an EtherCAT communications error is detected in a slave. At that time, the Servo Drive
will operate according to the Servo Drive specifications. Make sure that the

Fail-soft Operation

setting

results in safe operation when a device error occurs.

• EtherCAT communications are not always established immediately after the power supply is turned

ON. Use the system-defined variables in the user program to confirm that communications are es-
tablished before attempting control operations.

• If noise occurs or an EtherCAT slave is disconnected from the network, any current communications

frames may be lost. If frames are lost, slave I/O data is not communicated, and unintended opera-
tion may occur. The slave outputs will behave according to the slave specifications. Refer to the
manual for the slave. If a noise countermeasure or slave replacement is required, perform the fol-
lowing processing.
a) Program the Input Data Invalid system-defined variable as an interlock condition in the user pro-

gram.

b) Set the

PDO communications timeout detection count

setting in the EtherCAT master to at

least 2. Refer to the

NJ/NX-series CPU Unit Built-in EtherCAT Port User’s Manual

(Cat. No.

W505) for details.

• When an EtherCAT slave is disconnected, communications will stop and control of the outputs will

be lost not only for the disconnected slave, but for all slaves connected after it through to the physi-
cal end node. Confirm that the system will not be adversely affected before you disconnect a slave.

• I/O data communications of NX bus are not always established immediately after the power supply

is turned ON. Use the system-defined variables and the EtherCAT Coupler Unit device variables in
the user program to confirm that I/O data communications are established before attempting control
operations.

• You cannot use standard Ethernet hubs or repeater hubs with EtherCAT communications. If you use

one of these, a major fault level error or other error may occur.

• Confirm that all of the slaves are connected before you set the transmission delay time by the actual

measurement. If the transmission delay time is exceeded from the set values due to the changes of
the unit configuration, such as when the disabled salve is connected to the actual configuration after
the setting, it may cause illegal communications with slaves.

• When the communications cable that is connected to the slave from other manufacturers on the ring

topology is broken or the power supply to the slave from other manufacturers is interrupted, any cur-
rent communications frames may be lost.
If frames are lost, slave I/O data is not communicated, and unintended operation may occur.
When slaves from other manufacturers are connected on the ring topology, check the followings in
advance.
a) Disconnect and connect communications cables that are connected to the output ports of slaves

from other manufacturers several times, and there is no error except for a

Ring Disconnection

Detected

b) Disconnect and connect communications cables that are connected to the input ports of slaves

from other manufacturers several times, and there is no error except for a

Ring Disconnection

Detected

c) Turn OFF and ON the power supply to the slaves from other manufacturers, and there is no er-

ror except for a

Illegal Slave Disconnection Detected

• If you use the cable redundancy function, confirm that the task execution time is within the task peri-

od while the cable for the end port of the ring is disconnected. When a disconnection occurred on