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The checkbox can be found here: If you activate this option, you will get warnings in the TwinCAT XAE while you are online, in case the task time is exceeded. If such warnings occur, the task time is too low for your project size and CPU performance. ... View more

I am not sure if I understand your problem correctly, so first some words about the DistributeToChains property: The property is availabe in the Types tab at any child element of all project-specific FBs deriving from OpconUnit (also indirectly). The property is never read from OOD/OSD files as it only affects project-specific SFC sequences, so the user should decide whether he wants to have references to the sub-struct. With most objects (also the ones having InternalElements), the Unit FB is part of the library and not extended but only instantiated in the project. In this case, it is impossible to add the property. But in the same case, it is also impossible to create SFC chains, so the property wouldn't have any effect, anyway. By the way, the DistributeToChains property is more or less obsolete since Control plus Studio 5.1: Since that version, all SFC sequences are automatically generated with a reference to the Unit FB (rUnit), so they can access all sub-structs of the unit without bothering about DistributeToChains. In case this does not help you, I have some questions: Where exactly are you missing the property and what seems to be different to a normal CommandHandler? What's the nodeType of your object in the OOD file? Does your object generate a project-specific derivation for the unit FB? ... View more

I have looked into the problem, and the answer is: Part of the problem is a misbehavior, part is by design. Selecting elements of an enumeration or constant variables should be possible across the borders of subtrees. This does not work correctly. We will fix this in the next version. Selecting subtree variables (not constants) from outside their own subtree does not work, because these variables appear as simple-type variables in CpStudio although they are exported as arrays. When referencing them in the main tree, you would need to specify an array index corresponding to a subtree instance. This is technically impossible because the selection control can only link to data elements existing in CpStudio. ... View more