Error "Bad_Failure" when writing empty string to tag in Ignition

[WRM]

Hi everyone,

I'm encountering an issue in Ignition SCADA when writing an empty string ("") to a tag. After running my script, the tag value updates to an empty string as expected, but I still get a "Bad_Failure" error popup. Here are the details:

Error writing "" to tag [Default]TestCompany/ML/A3/ObjID_Des Bad_Failure

• Tag Path: [Default]TestCompany/ML/A3/ObjID_Des
• Error Message: Error writing "" to tag [Default]TestCompany/ML/A3/ObjID_Des Bad_Failure
• Script Behavior: My script sets ObjID_Des to "". The tag value updates correctly, but the error persists.
• Tag Configuration:
  -- Access Rights: Read_Write
  -- Tag Quality: Good
  -- Data Type: String
  -- OPC PLC Settings: Confirmed that the PLC allows writing empty string values
  -- Security: Configured to allow Read_Write for anyone
  What I've Tried:

Verified that the tag is writable and has no security restrictions.
Checked the OPC server connection, which is stable.
Confirmed the PLC accepts empty strings for this tag.

Questions:

• Why does writing an empty string trigger a Bad_Failure error even though the tag updates correctly?
• Is there a specific configuration in Ignition or the OPC server I should check to allow empty string writes without errors?
• Could this be related to the tag's OPC item settings or a bug in Ignition?

Thanks in advance!

[Kevin.Herron]

Is this a third party OPC server or Ignition OPC UA + driver? If Ignition, which driver? What’s the OPC Item Path of the tag?

[robertm]

What if you write an ASCII 0x00, does it error?

[WRM]

Sorry for getting back to you late! Here’s the image with the tag properties. I’m still figuring this out, so if you have any questions, just let me know!

[Kevin.Herron]

Set the logging level for the com.inductiveautomation.ignition.gateway.opcua.client.connection.OpcUaConnection logger(s) to DEBUG and then try the write again. Afterwards see if there is an error in the gateway logs.