About OPC UA access to individual tags

The

OPC UA Access

property setting in Logix Designer Tag Editor specifies the level of access (Read Only, Read/Write, or None) for external OPC UA clients. This property setting applies to tags exposed to OPC UA clients directly from the controller.

This table describes OPC UA settings.

OPC UA Access setting	Description
Read/Write	External OPC UA clients have full access to the tag and can read and change the tag's value.
Read Only	External OPC UA clients can read, but cannot change, the tag's value.
None	External OPC UA clients cannot read or change the tag's value.

After you create a new tag, you can modify the tag's OPC UA access. You can configure OPC UA Access for controller and program-scoped tags.

For safety tags, there are certain limitations:

When the controller is online, you cannot edit the OPC UA Access of a safety tag.
When the controller is online and the tag is published in OPC UA server, you cannot delete the safety tag.
When the controller is online and the tag is published in OPC UA server, you cannot rename a safety tag.
When the controller is online, you cannot rename safety programs that expose safety tags in OPC UA server or rename safety programs that are parents of those safety programs.
When creating a safety tag and the controller is online, is the only level of access that is available for selection is None.
Safety tags have Read Only or None levels of access.