Publication 1756-PM004C-EN-P - October 2009 73
Data Access Control Chapter 4
User-defined Type
Considerations
The three external access options—Read/Write (default), Read Only, None—
are chosen from the External Access column on the Data Type
dialog box.
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 cells for the child-members are
disabled on the User-defined Data Type dialog box.
• 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 is given to its child-members.
• If the member’s data type is User-defined and the child-member has a
different external access level from its parent, the more restrictive
external access level is applied.
The following table describes the conditions in which the External Access
column is disabled.
Availability of the External Access Setting for Structured Data Types
Topic Considerations
Modify existing
data type
The External Access column is disabled if:
• you do not have permission to change the external access
settings.
(1)
• the redundancy controller is in any state that does not allow
changes.
• the data type is applied to tags and the controller is online.
Note: Data type size is not affected by the external access
attribute.
(1)
If you have User-defined Data Type Modify permission, you also can modify external access of a User-defined
data type.
Predefined,
module-defined,
Strings type
The external access column is always visible but disabled. The ‘Set
External Access’ entry is added to the bottom of the row header
context menu, but it is always disabled.
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