False positive "Wire: is a member of a cycle" error!

[golubovski]

Hello, I have a strange problem with implementing IF-THEN conditioning of parts of code. On the attached diagram I would like to put all DAQ tasks in separate IF-THEN blocks to exclude them from a DAQ if no channels of their are invloved. However, LV2011SP1f1 does not allow me to do that with error: "Wire: Is a member of a cycle" Obviously that is not the case, I am just passing error clusters through it. Am I missing something here or is it a bug? Thanks in advance,

[GerdW]

Hi golubovski,

yes, there's a cycle: the error cluster between the two case structures form a cycle.

The upper case of both has two tunnels: one is an output, the second one is an input. Both are connected to the lower case structure, again forming in-/output. LabVIEW can run the upper case structure only, when all inputs are ready. But the second input is only ready after running that case - cycle error...

[TiTou]

It's normal, try to think in terms of data flow, you're trying to connect your error wires in and out of the case structure a little too much.

I suggest you keep one error wire per DAQmx task instead of using one for all your tasks.

[golubovski]

Thank you both to clearing this up to me! I guess I sounded stupid, but I see the error cluster as a fixed RAM location where blocks write to (update) and read from the status. So it was logical to me to do that :)))

Aplogies,

[TiTou]

There is no stupid questions!