Omron Sysmac NJ Series User Manual page 97

The cable between the EtherCAT master and a slave and between any two slaves (L1, L2 ... Ln) must
be 100 m or less.
Firmly connect the communications cable connector until it clicks into place.
Precautions for Correct Use
Always perform one of the following operations before you disconnect the communications ca-
ble to a EtherCAT slave during operation.
• Disconnect the EtherCAT slave from the network.
• Disable the EtherCAT slaves and all slaves connected after it.
Refer to 9-4 Replacing Slaves during Communications on page 9-26 for information on replac-
ing slaves during operation.
Additional Information
Make sure the cable between each pair of devices connects an output port to an input port.
Normal communications are not possible if an output port is connected to another output port or
an input port is connected to another input port.
NJ/NX-series CPU Unit Built-in EtherCAT Port User's Manual (W505)
EtherCAT master
L1
L2
Ln
Do not connect anything
4 EtherCAT Network Wiring
Communications cable
Input port
Output port
Last slave
Slaves
4
4-17