Omron SYSMAC CJ1W-EIP21, Operation Manuals

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1 Introduction
1-14
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)

Right and Left Dot LEDs
If an error occurred in two or more devices with the same rightmost byte in their IP addresses, the
Right Dot LED will be lit while the device error is being displayed.
Example: Displaying the Following Errors
• A d6 error (failed to establish connection) occurred with IP address 10.0.1.8.
• A d6 error (failed to establish connection) occurred with IP address 10.0.2.8.

Unit Number Setting Switch
The Unit Number Setting Switch sets the unit number of the EtherNet/IP Unit as a CPU Bus Unit.
Note The unit number is factory-set to 0.
The unit number can be set to any number in the setting range (0 to F), as long as the same number
is not set on another CPU Bus Unit in the same Controller.
Precautions for Correct Use Precautions for Correct Use
• Use a small screwdriver to make the setting, and be sure not to damage the rotary switch.
• Always turn OFF the Controller's power supply before setting the unit number.
Additional Information
• The unit number is factory-set to 0.
• If the same unit number is set on more than one CPU Bus Unit mounted in a Controller, a unit
number duplication error will occur in the Controller and the EtherNet/IP Unit will not be able to
start operating.
Switch Settings
Setting method Setting range
One-digit hexadecimal 0 to F
FEDC
BA987
654
3210