Omron sysmac EtherCAT NJ101 Series Connection Manual page 24

7．EtherCAT Connection Procedure
6
The variable names and types
are set.
Additional Information
The device variables are automatically created by combining the device name and the port
name. The default device names are "E" followed by a serial number starting from "001".
Additional Information
In this guide, device variables are automatically named for each slave unit.
They can also be manually named for each port.
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