Allen-Bradley 1756-L61 ControlLogix 5561 Programming Manual page 76

Chapter 4 Data Access Control
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The table below describes the External Access options for various Add-On
Instruction parameters and tags.
Add-0n Instruction Parameters and Tags
Local tag
Input parameter
Output parameter
EnableIn parameter
EnableOut parameter
InOut parameter
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.
Dialog Box/Window
New Add-On Instruction
Parameter or Local Tag
Rockwell Automation Publication 1756-PM004D-EN-P - September 2012
External Access Options
Read/Write
Read Only
None
Read Only
Not Applicable
Considerations
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.