Storage of Information within the screw

I have an interesting problem...

I have a VI that controls a subsystem. It has about 80 entries, when he used the subsystem with these entries programs. Entries are not homogeneous, they are information configuration and each means something different. This VI allows interactively and as part of a larger system. Since it has many entries I used clusters of group related entries.

As far as I can say LabVIEW applies the following scope rules when SubVIs are involved:

Controls that are wired to the login Panel

When a top-level VI calls a Subvi if highest level VI son an entry then the Sub - VI receives this value. If the VI more high-level wiring is not an entry, then the default value is used.

Controls that are not wired for the login Panel

When a VI is loaded into memory front panel is loaded with the default values, even if the VI is not visible. LabVIEW retains the values defined by the last use of the VI. It goes the same for registry entries to offset unwired.

The behavior of controls unwired is useful because it allows information to be stored, it allos "masking of information." In my application I can open the VI subsystem described above in an interactive way and set up some values. Screw top level then call that VI as usual. These screws of higher level need not know anything about the settings I changed. Where I work, this idea is used in the code for many years. It is similar to the "functional global variables" using terminals unwired-shift register.

Once a control should be wired to the component connector however everything changes, a value may not persist a use of the VI to the other.  This is true even if the connector pane entry is left connected because otherwise LabVIEW use it * default value * not the existing value. Thus, all controls dealing with things my subsystem-specific low-level can be left unwired. Then all controls dealing with things higher level that allows to control the higher level screw must be wired and the highest level VI must assume responsibility for this information. Previous versions of the system that I mention did.

The problem with this plan is that the clusters.  A cluster is either on a connector component or not, I can find no way to put a cluster on the connector pane entries but not others. Since I have so many entries, I need bunches. But, once I attribute a cluster to the connector pane the top-level screws must take responsibility for all its values. This means that I lose all the concealment of information that I had before and my code becomes much more complicated.

Someone at - he found a solution to this kind of problem?

I can draw out as example screws if people are interested.


Tags: NI Software

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