Shared variable clusters not working as intended

Hi All,
I've been using shared variables to communicate between a host computer and a crio real time target. This works well as simple variables. I configured a cluster of shared variables to try and clean up the code a bit.
I have a couple of problems. If I write to a single element, using bundle, the other elements in the cluster that I do not want to write to are overwritten with some unknown default value. Second, when the host computer program is stopped, the cluster on the RT host writes what appears to be default values to all the variables in the cluster on the RT. The idea is to keep the RT program running in it's current state until the host computer recovers. Of course this is impossible, if it resets all the data to default.
It appears that I can only write to a cluster on one side and read on the other side. I cannot read/write to the same cluster at different points on the host and target machines. With a single shared variable, I can read/write to my hearts content on any process. I haven't been able to find a way to solve this.
I will post the code, but you will need a cRIO to run it. If anyone is using clusters in shared variables, I'd be curious to see how you are doing it.
Thanks,
John
Solved!
Go to Solution.
Attachments:
host cluster test.vi ‏25 KB
rt target cluster test.vi ‏25 KB
Params 1.ctl ‏6 KB

That makes some sense, what I can think of is you are writing to the same cluster in two different places. Each place updates both values so if the host writes B1=False and B2=True then the Rio Writes B1=False and B2=False then the variable will have the latest value of both being false.It's a loop condition.
Even though you are only setting one value in the bundle by name the other value is coming from the cluster input to the bundle by name.
To handle this you will need remove the input cluster to the bundle by name and replace with the shared variable read. This is where you may need a delay to ensure the variable has the most recent updated value.
Also you still have the coercion dots. For the shared variable try linking it to the custom control instead of a undefined cluster (Next choice below in the SV setup)
Robert Fogg
Certified LabVIEW Architect
Attachments:
host cluster test.vi ‏27 KB

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