I have now completed the project, it was relatively time-consuming to design the flow so that it works for all special cases. Overflow of status messages was also a big issue.
You could also optimize the flow by adding the status of the blast gates (open/close). But that would also bring other dangers in terms of overloading with stuck flaps.
Well, that was just my concept and now it works 
You can find the entire project with photos and explanations here:
Thank you very much for your help and feedback!
Steff
