Rockwell Automation Logix5000 Controllers I/O and Tag Data Programming Manual - Manual (Page 72)

Chapter 4 Data access control
1. In the Controller Organizer, right-click the data type and then click
Properties.
2. In the Data Type editor, click the Properties tab to display the Properties
pane. Click the pushpin icon to keep the Properties pane open.
3. In the External Access list, choose the external access option.
Three external access rules apply for members of User-defined data types.
• You can only set external access for the top members of that User-defined
data type. External Access lists for the child-members are unavailable on
the User-defined Data Type Editor.
• If the member’s data type is Predefined structural, Module-defined, or
String, you cannot set external access of child-members. The external access
level of the parent member applies to its child-members.
72 Rockwell Automation Publication 1756-PM004E-EN-P - October 2014