4 EtherCAT Network Wiring
4-8
NJ/NX-series CPU Unit Built-in EtherCAT Port User’s Manual (W505)
Cable connections can be made freely in EtherCAT networks. Connect the communications cable from
the EtherCAT master to the input port on the first slave, and then connect the communications cable to
the next slave to the output port on the first slave.
Do not connect anything to the output port of the slave at the end of the network.
The cable between any two nodes (L1, L2 ... Ln) must be 100 m or less. Use the Sysmac Studio to con-
firm if communications are possible for the total cable length. Firmly connect the communications cable
connector until it clicks into place.
Precautions for Correct UsePrecautions for Correct Use
Always perform one of the following operations before you disconnect the communications cable
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 for information on replacing slaves during
operation.
Make sure the cable between each pair of devices connects an output port to an input port. Nor-
mal communications are not possible if an output port is connected to another output port or an
input port is connected to another input port.
4-1-4 Connecting Communications Cables
Do not connect anything
Last slave
Slaves
Output port
Input port
Communications cable
EtherCAT master
L1
L2
Ln
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