FAQ - How to solve Tag Name Resolution Error on Sysmac

Q: How to solve the Tag Name Resolution Error (0x34270000)?

A: This error can be caused by different reasons as follows:

Indicates that the tag resolution for CIP communications 

• The size of the network variable is different from the tag settings. 

• The I/O direction that is set in the tag data link settings does not agree with the I/O direction of the variable in the CPU Unit. 

• There is no network variable in the CPU Unit that corresponds to the tag setting. 

When this error happens, you must check the following: 

• Check that network variables have the proper size. Originator Variable and Target Variable must have the same byte size.

• The I/O direction that is set in the tag data link settings does not agree with the I/O direction of the variable in the CPU Unit. Review that the Tag Set Name has the correct name of the Network variables published.

• There is no network variable in the CPU Unit that corresponds to the tag setting. Go to Sysmac Studio Tools Menu, open the Ethernet IP Connection Settings:

With the Window open, double-click on the PLC that has the error: 

Open the Connection Tab, and you should see all the devices registered. Delete all the ones that are not connected to the network. Right-click on the device and select Delete: 

Open the Tag Set Tab and verify that all the tags were deleted: 

Click the Transfer to Controller button to save the new settings (If it is gray out, go online with the controller first):

Date/Revision History

First review 09/12/2025 V1.0

Author:

Karla Flores Avila, Technical Support Specialist

References

NJ/NX-series CPU Unit Built-in EtherNet/IP Port User's Manual