Omron CJ1W-ID Series User Manual page 27

EtherNet/IP Communications
• Make sure that the communications distance, number of nodes connected, and method of connec-
tion for EtherNet/IP are within specifications.
Do not connect EtherNet/IP communications to EtherCAT or other networks. An overload may cause
the network to fail or malfunction.
• All related EtherNet/IP nodes are reset when you transfer settings for the built-in EtherNet/IP port
(including IP addresses and tag data links settings). The settings can only be enabled after the reset.
Confirm that the system will not be adversely affected by resetting nodes before you transfer the set-
tings.
• If EtherNet/IP tag data links (cyclic communications) are used with a repeating hub, the communica-
tions load on the network will increase. This will increase collisions and may prevent stable communi-
cations. Do not use repeating hubs on networks where tag data links are used. Use an Ethernet
switch instead.
EtherCAT Communications
• Make sure that the communications distance, number of nodes connected, and method of connec-
tion for EtherCAT are within specifications.
Do not connect EtherCAT communications to EtherNet/IP, a standard in-house LAN, or other net-
works. An overload may cause the network to fail or malfunction.
• Malfunctions or unexpected operation may occur for some combinations of EtherCAT revisions of the
master and slaves. If you disable the revision check in the network settings, use the Sysmac Studio
to check the slave revision settings in the master and the actual slave revisions, and then make sure
that functionality is compatible in the slave manuals or other references. You can check the actual
slave revisions from the Sysmac Studio or on slave nameplates.
• After you transfer the user program, the CPU Unit is restarted and communications with the Ether-
CAT slaves are cut off. During that period, the slave outputs behave according to the slave specifica-
tions. The time that communications are cut off depends on the EtherCAT network configuration.
Before you transfer the user program, confirm that the system will not be adversely affected.
• If the Fail-soft Operation parameter is set to stop operation, 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
parameter 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 estab-
lished 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 operation
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 following pro-
cessing.
• Program the Input Data Invalid system-defined variable as an interlock condition in the user pro-
gram.
• 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 physical
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.
NJ-series CPU Unit Hardware User's Manual (W500)
Precautions for Safe Use
25