2 Starting a Sample System
2 - 20 EtherCAT Communication Unit USER’S MANUAL (I574-E1)
Perform the wiring for the communications cables.
Determine the number and length of communications cables that are appropriate for your system con-
Each communications cable between the nodes (and between the master and the nodes) must be no
longer than 100 m.
In the system configuration example used in this section, a cable of 5 m is prepared for communications
cable 1, and a cable of 1 m is prepared for communications cable 2. Connect an RJ45 connector to
both ends of the communications cable by wiring them straight. Connect both ends of the shielded
wires of the cable to the hoods.
For details on preparing the cables, refer to 2-1-6 Connection between Communications Cables and
Connectors on page P. 2-8.
Securely connect the EtherCAT communication cable connector to the EtherCAT Communication Unit
by inserting the connector all the way until it clicks.
Connect the communication cable from the EtherCAT master side to the communication connector IN
of the Communication Unit.
Connect the communication connector OUT to the communication connector IN of the next EtherCAT
Do not connect the communication connector OUT of the last EtherCAT slave.
Data will not be communicated correctly if the input/output are connected in reverse.
In the system configuration example used in this section, the connectors below are connected with the
communications cables.
Note: Do not connect anything to 2nd inverter OUT.
If a slave other than this product is used in your system configuration, set the unit in the same way by
referring to its User Manual.
2-5-3 Wiring the EtherCAT Communication Unit
Preparing the communications cables
Wiring the communications cables
Connecting from Connecting to
Communications cable 1 Master Unit 1st inverter IN
Communications cable 2 1st inverter OUT 2nd inverter IN
Master Unit side
Slave Unit side
FG cable
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