Unable to read data from Control Logix

[Danyal]

Hello everyone,

I am trying to read data from Allen Bradley PLC. However, Kepserver is unable to read all the data. Below are few errors that are occurring:

Date Time Level Source Event
12/23/2025 6:20:52 PM Warning Allen-Bradley ControlLogix Ethernet  | Unable to read tag. Controller tag data type unknown. Tag deactivated. | Tag address = 'PROGRAM:P09_INFEED.STCAMSBM1', Data type = 0XD37F.

Date Time Level Source Event
12/23/2025 6:20:52 PM Warning Allen-Bradley ControlLogix Ethernet | Unable to read tag. | Tag address = 'PROGRAM:P09_INFEED.FBSTARAXIS3', CIP error = 0XF, Extended error = 0X2100.

Date Time Level Source Event
12/23/2025 6:36:03 PM Error Allen-Bradley ControlLogix Ethernet  | Database error. Unable to resolve CIP data type for tag. Setting to default type. | CIP data type = 0X8871, Tag name = 'OPT_PrintCheck', Default data type = 'DEFAULT'.

Can anyone help me above issues please ?

Regards,

Danyal Shahzad

[rajskumar]

Hello,

Please take a look at the following article as it may help resolve your issue:

CS419100 - Error "Database error. Unable to resolve CIP data type for tag. Setting to default type. | CIP data type = <type>, Tag name = '<tag>', Default data type = '<type>'" in Allen-Bradley ControlLogix Ethernet of PTC Kepware Products

If you are prompted to log in to view the complete article, you can use your MyKepware login credentials.

Thanks