82 Rockwell Automation Publication 1756-PM004D-EN-P - September 2012
Chapter 4 Data Access Control
Add-On Instructions Constant
Value Considerations
The Constant attribute applies only to InOut parameters. The default setting of
the property will be not a Constant Value.
The Constant attribute will not apply to Input, Output, EnableIn and EnableOut
Add-On Instruction parameters. It will not apply to Add-On Instruction Local
tags.
By denoting an InOut parameter of an Add-On Instruction as a constant, it
means that within the Add-On Instruction, that parameter cannot be written to.
The project will fail verification if this type of write is attempted.
Appropriate usage of Constant tags is monitored by logic verification.
To Next Page
Loading...
Need help?
General
