74 Publication 1756-PM004C-EN-P - October 2009
Chapter 4 Data Access Control
Add-On Instructions
External Access
Considerations
External Access settings can be used with parameters and local tags of
Add-On Instructions. For example, if an input parameter is defined with
external access of ‘read only’, the member that represents that parameter in the
Add-On Instruction data type cannot be written.
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.
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
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