Omron TJ2-MC02 Hardware Reference Manual page 215

Hardware reference
EtherCAT connectors (ECAT IN & OUT)
Connect the EtherCAT master to the ECAT IN connector on the first Servo
Drive. Connect the ECAT OUT connector on the first Servo Drive to the
ECAT IN connector on the next Servo Drive. Do not connect the ECAT OUT
connector on the last Servo Drive.
Note
Always turn OFF the power supply to the Machine Control Unit
and Servo Drives before connecting or disconnecting the
EtherCAT Communications Cables.
The cable between two nodes (L1, L2 ... Ln) must be 100 m or
less.
HARDWARE REFERENCE MANUAL
fig. 116
L1 L2 Ln
209