Publication 1756-PM004C-EN-P - October 2009 77
Data Access Control Chapter 4
Add-On Instruction Edit
Tags
Note: External access is not applicable for InOut parameters
because they are just references until invoked.
The External Access column is disabled if:
• EnableIn and EnableOut parameters, which
default ‘Read Only’.
• you do not have permission to change the external access
settings.
(1)
• the controller is online.
• the tag is an alias tag.
• the Add-On Instruction is in Source Protection mode.
• the row represents an expanded array dimension, bit, or data
member.
When creating a new parameter, changing usage causes the
External Access column auto update to default to:
• Input parameter - equipment phase input parameter and
Add-On Instruction input parameter.
• Output parameter - equipment phase output parameter and
Add-On Instruction output parameter.
• InOut parameter - External Access column cell is blank and
disabled.
• Local tag - external access is updated to ‘None’.
Changing external access attributes will cause:
• a warning message if you change a tag from Input or Output
parameter to InOut parameter and the present attribute is
either ‘Read/Write,’ or ‘Read Only’.
• no change if you switch between Input, Output parameters
and Local tag
• the value of the external access updates to the new target
for an alias.
(1)
If you have Add-On Instruction Modify permission, you also can modify external access of an
Add-On Instruction tag.
Add-On Instruction External Access Variables
Dialog Box/Window Considerations
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