76 Rockwell Automation Publication 1756-PM004D-EN-P - September 2012
Chapter 4 Data Access Control
Tag Mapping Considerations
Only tags with external access settings of Read/Write or Read Only can be
mapped to a PLC-2 controller and PLC-5/SLC controllers.
Imported Tag Behavior
The Logix Designer application preforms a check to verify an imported program
file has a valid external access value. A default value is assigned to unspecified tags
that are imported from programs that have software with versions earlier than 18.
An error message displays in the Logix Designer application for imported files
that contain tags with any value other than Read/Write, Read Only, and None.
Dialog Box/Window Considerations
PLC-2, PLC-5/SLC Mapping To map a tag:
• Type a file number.
• Choose a tag from the Name box. Only eligible tags that are set to either
Read/Write or Read Only will display in the menu.
If you manually type the name of a tag whose external access is set to None, an
error message displays.
• Click OK.
Object Name Default External Access
Controller and program-scoped standard tags Read/Write
All safety tags Read Only
Add-on Instruction local tags Read/Write
Add-on Instruction Input parameters Read/Write
Add-on Instruction Output, EnableIn and EnableOut parameters Read Only
Add-on Instruction InOut parameters N/A
Equipment phase output parameters Read Only
Members of all data types Read/Write
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