Rockwell Automation Logix5000 Program Parameters Programming Manual - Manual (Page 28)

Chapter 1 Connecting program parameters
The following information summarizes the program parameter connection rules.
Standard program to standard program connection rules
The following table summarizes the rules for using program parameters to connect
two standard programs.
Tip: The connection rules for programs also apply to Equipment Phases.
Program_A
(Standard)
Program_B
(Standard)
Input Output InOut Public Controller Scope Tag
(Standard Class)
Input — Yes — Yes Yes
Output Yes — Yes* Yes Yes
InOut — Yes* — Yes Yes
Public Yes Yes Yes — Alias
Controller Scope Tag
(Standard 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).
• Parameters of the same type cannot be connected together.
• Public tags can only bind to controller scope tags using an alias.
Program parameter
connection rules
28 Rockwell Automation Publication 1756-PM021A-EN-P - October 2014