Passing Input Variables as Reference to Multiple Nested Sub-Processes

Question

Hi All, 
 I have a boolean variable in my initial process that I need to reference in a sub- sub- sub- process, is this possible? Can you pass a single variable through 3 process models to be used by the 4th based on the value from the 1st? 
 It's difficult to explain, but I need to know whether or not the initial process was scheduled or ad-hoc (the boolean value) in the 4th sub-process of this overarching process in order to make appropriate task assignments in the last model. 
 I passed the variable as reference in the Sub-Process node of the 1st model, but when I try to do it again in the 2nd sub-process the variable doesn't appear as an input variable even after hitting Refresh. 
 Thanks for more info!

Robert Shankin · Accepted Answer

Hi Sarah - 
 
So, 2 things: 
1st, I think I misunderstood your question, and that you were interested in using the setting "Pass as a reference" that synchronizes values in real time between processes. Reading again, it sounds like your key concern is passing the variable down from parent process to child process, again and again. 
Sorry about that. 
 
2nd, on to your real issue. 
Each sub process node is examining the condition of the parameter process variables in the target process. 
If you're hoping to map to a Boolean PV in the sub process, create a PV of type Boolean, e.g. myBool, and make sure to set it as a parameter so it can accept input values on process start. Then be sure to do a save and publish on that child (sub) process. 
After the save and publish, you should see the variable for mapping in the sub process node of the parent process. 
Since you have a number of sub processes, might want to start at the sub-most process, creating the PV, saving and publishing, and then mapping the variable in the parent process, and so on. 
 
Does that make sense? 
 
Thanks, 
Rob

smriti p0001 · Answer

Yes, you can do this by creating variable as parameter and then you need to pass its value to next process model by creating pv in all child process and setting the value from previous one.

vijayd · Answer

Pass of reference will be used when the variable passed from parent process to sub process changes in sub process, it would be reflected in the parent process.