Omron E2E series Network Connection Manual page 27

7．IO-Link Connection Procedure
Additional Information
The device variables are named automatically from a combination of the device names and
the port names. For slave units, the default device names are "E" followed by a serial number
that starts from 001. For NX Units, the default device names are "N" followed by a serial
number that starts from 1.
Additional Information
In this document, device variables are automatically named for a unit (a slave).
Device variables can also be manually named for ports.
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