IAC internal communication
I use Functional diagrams in 800xA v6.0.3. As far as I know, communication between diagrams (functions) is possible only with communication variables (CV). Because of default limitation of 32 CV per diagram / 1024 CV per application / 128 diagrams per application, I created 6 applications which are connected to 1 controller. Recently I read manual about IAC and I found out that my communication variables are classified as internal - so there is no real communication, only physical memory is coppied. I assume this limit of CV per diagram/controller is only for external IAC communication.
My question is: Can I cancel this limitation of CV in my project and use hundreds of internal CV in one function diagram to reduce number of diagrams and applications without any risk of malfunction? Do you have any other solution or advise?
Thanks for your reply
Voted best answer
I found in my application no direct influence on load with internal IAC variables, and even with communication between controllers we have cases with more than 1000 Values sent without issues...
Recommendations in the manual to ensure controller system load is within the permissible limit.
Always best practice to use the monitoring values via IAC/EAC,
since at certain time when the controller system load crosses the limit limit then intermittently you may loose control actions when you use control variables in IAC/EAC.