Omron CK3W-GC 00 Series Hardware User Manual page 23

• EtherCAT communications 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 opera-
tions.
• If you need to disconnect the cable from an EtherCAT slave during operation, first reset the Ether-
CAT and EtherCAT slaves that are connected after it to the Init state, then disconnect the EtherCAT
slave.
• For EtherCAT and EtherNet, use the connection methods and cables that are specified in this man-
ual. Otherwise, communications may be faulty.
• Make sure that all of the slaves to be restored are participating in the network before you reset the
EtherCAT Master Function Module. If any slave is not participating in the network when any of these
errors is reset, the EtherCAT Master Function Module may access a slave with a different node ad-
dress than the specified node address, or the error may not be reset correctly.
• There is a time lag between the moment when this Controller sends a command value to the Ether-
CAT type Servo Drive and the moment when it receives the feedback value. Perform servo control
taking this time lag into consideration.
• When the cable connected to the third-party slave on the ring topology is disconnected or the power
supply is disconnected, the frame being communicated may be lost. If the frame is lost, the input or
output data of the slave will not be transmitted, and unintended operation may occur.
Before connecting a third-party slave on the ring topology, check the followings.
a) Connect and disconnect the communication cable connected to the OUT port of the third-party
slave several times, and check the status change of ECAT[i].RedundantLineBreak and
ECAT[i].RedundantLineFixed will only occur.
b) Connect and disconnect the communication cable connected to the IN port of the third-party
slave several times, and check the status change of ECAT[i].RedundantLineBreak and
ECAT[i].RedundantLineFixed will only occur.
c) Turn the power OFF and ON of the third-party slave, and check that other slaves are not in any
errors.
EtherNet/IP Communications
• Unexpected operation may result if inappropriate data link tables are set. Even if appropriate data
link tables have been set, confirm that the controlled system will not be adversely affected before
you transfer the data link tables. The data links start automatically after the data link tables are
transferred.
• 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 commu-
nications. Do not use repeating hubs on networks where tag data links are used. Use an Ethernet
switch instead.
• Make sure to use the communications distance, number of nodes connected, and method of con-
nection for EtherNet/IP within specifications. Do not connect EtherNet/IP communications to Ether-
CAT or other networks. An overload may cause the network to fail or malfunction.
CK3M-series Programmable Multi-Axis Controller User's Manual Hardware (O036)
Precautions for Safe Use
21