Siemens TIA: Block not enabled?

Hello,

I have sometimes a problem with a function block: sometimes it looks like it is not enabled (because block is not green). Then, I have indeed a problem with an output of this block.
See picture in attachment.

How can I find what the problem is?

Examine the logic in the block and see how the block result is processed.

It doesn:t look right. Is the block uptodate in the CPU?
Is this real hardware or PLCSIM?
Is this Schneider's Block for communication with drive?
I don't remember if communication blocks that execute asynchronously do have that behavior, I doubt it.


Is this a cyclic OB, FB or cyclic interrupt?

Open the logic block FB14, and post the code here, and from which block is this block called? Follow the path to the beginning.