72 Publication 1756-PM004C-EN-P - October 2009
Chapter 4 Data Access Control
Tag Editor The External Access box is disabled if:
• you do not have permission to change the external access
settings.
• the redundancy controller is in any state that does not allow
changes.
• the controller is user-locked online.
• the controller is safety-locked and the tag is a safety tag.
Only the safety tags’ External Access cell is disabled.
• the Scope is an equipment phase and the equipment phase
feature is not activated in the current license.
• the tag is an alias tag.
• the controller is in hard-run mode.
• the row represents an expanded array dimension, bit, or data
member.
For tags of Predefined (Atomic and Structural), Module-defined
Data Types and String, all of these tag members will have the
same external access level because:
• they are all hard-coded to ‘Read/Write’ and you can only
view, not change, this value. You also cannot change external
access for the data type members.
• an external access change on the tag results in an update on
all tag members.
For Array tags, all elements:
• must have the same external access level.
• of all data members for predefined or module-defined data
types will have the same external access setting.
• of each data member for user-defined type (UDT) and Add-On
Instruction will have the more restrictive external access
setting between the element external access setting and the
external access setting of the member in the type definition.
External Access Variables
Dialog Box/Window Considerations
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