74 Rockwell Automation Publication 1756-PM004D-EN-P - September 2012
Chapter 4 Data Access Control
The table below describes the External Access options for various Add-On
Instruction parameters and tags.
The external access for an Add-On Instruction tag can be chosen from the box on
the New Tag dialog box or from the External Access column on the Tag Editor
window.
The external access of an Add-On Instruction’s parameters and local tags can be
configured in the Add-On Instruction Definition dialog box and on the Add-On
Instruction Parameters and Local Tags dialog boxes.
For alias parameters, the external access type is equal to the type configured for
the base local tag.
Add-0n Instruction Parameters and Tags External Access Options
Local tag
Read/Write
Read Only
None
Input parameter
Output parameter
EnableIn parameter
Read Only
EnableOut parameter
InOut parameter Not Applicable
Dialog Box/Window Considerations
New Add-On Instruction
Parameter or Local Tag
If the current usage is:
• Input parameter - the External Access box is enabled and the displayed value is
your last selection when creating an equipment phase input parameter or Add-On
Instruction input parameter.
• Output parameter - the External Access box is enabled and the displayed value is
your last selection when creating an equipment phase output parameter or
Add-On Instruction output parameter.
• InOut parameter - the External Access box is disabled and blank.
• Local tag - the External Access box is disabled and the displayed value is None.
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