64 Publication 1756-PM004C-EN-P - October 2009
Chapter 4 Data Access Control
Configure External Access
You configure external access from a pull-down menu when you create a new
tag or data type. You can also modify that value just like other tag attributes.
These changes can be made throughout the software. For example, they can be
made in the User-defined Data Type Editor, New Tag Dialog, and the Tag
Properties Dialog.
External Access Options
You can choose one of three options—Read/Write, Read Only, None from
the External Access box on the following RS Logix 5000 dialog boxes:
• New Tag (See
page 66
)
• Tag Properties (See
page 68
)
External Access Settings Description
Read/Write External applications and devices have full access to the
tag and can read and change the tag’s value.
Read Only External applications can read, but cannot change, the
tag’s value.
None External applications cannot read or change the
tag’s value.
RSLogix 5000 programming software has full access to all tags,
regardless of their External Access settings. External access
applies to all program, controller, and Add-On Instruction
scoped tags.
If the controller is in safety locked mode, only the safety tags
will be disabled from being accessed. The standard tags will
have the same behavior as in the unlocked mode.
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