Rockwell Automation Logix5000 Program Parameters Programming Manual - Manual (Page 29)

Connecting program parameters Chapter 1
Safety program to safety program connection rules
The following table summarizes the rules for using program parameters to connect
two safety programs.
Tip: The connection rules for programs also apply to Equipment Phases.
Program_A
(Safety)
Program_B
(Safety)
Input Output InOut Public Controller Scope
Tag (Safety Class)
Input — Yes — Yes Yes
Output Yes — Yes* Yes Yes
InOut — Yes* — Yes Yes
Public Yes Yes Yes — Alias
Controller Scope
Tag (Safety Class)
Yes Yes Yes Alias Alias
• * An InOut parameter can only be connected to an Output parameter if the
InOut parameter is configured as a constant.
• An Input parameter from Program_A can connect to an Output parameter
of Program_A (wrap around).
• Safety mapping must be used to connect standard class tags to safety class
tags/parameters.
• Standard class tags cannot alias safety class tags.
Rockwell Automation Publication 1756-PM021A-EN-P - October 2014 29