78 Publication 1756-PM004C-EN-P - October 2009
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 RSLogix 5000 programming software 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 RSLogix 5000 software for imported files that
contain tags with any value other than Read/Write, Read Only, and None.
PLC-2, PLC-5/SLC External Access Variables
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
pull-down menu.
If you manually type the name of a tag whose external
access is set to None, an error message displays.
• Click OK.
Default External Access Values for Imported Program Files
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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