Data modified from different sources

I have a problem with getting data into an AB ML1200 PLC. I will simplify this to explain: I have data going into reg N7:0 thats the result of a calculation. Lets say
"N7:0=TextEntry1.value*10". All goes well, but there is another local HMI that also writes to N7:0. Although this local HMI's N7:0 value shows the reflected change of the calc above from Lookout, any attempt to change the local HMI's N7:0 value is overridden by the calc. I need to be able to change the value from the local HMI and have Lookout update the "TextEntry1.value" to reflect the change. It sounds simple enough but it's kickin' my butt! As a sidenote I wouldn't have this problem if the AB driver in Lookout for the MicroLogix supported float (F) regs - I was kind of shocked it did not. Any ideas?
Solved!
Go to Solution.

It looks like you need to make the connection on remote source. For example, create a pot. On its property page, edit its remote source to the N7:0. It will be both read and write connection.
But you also need to mutiply the value by 10, so you can first create an Alias on N7:0 by right-clicking on driver object and select Edit Data Member Configuration. Input the scaling, for example, raw value from 0 to 100, and eng value from 0 to 10, so that this Alias will represent the value of N7:0/10. Give a name to this Alias. And then, bind the pot's remote source to this Alias. Have a try.
Ryan Shi
National Instruments

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Go to Solution.
Attachments:
test notification loop.vi ‏42 KB

Here is my modification of your VI. I put notes on the block diagram to explain the changes. It uses a queue for the data transfer to avoid loss of data. It uses a notifier to stop the loops. All local variables and Value property nodes have been eliminated.
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Solved!
Go to Solution.
Attachments:
Serial Read and Write to .tdms & Compare on Graph - test.vi ‏58 KB
Teraterm - Results.xlsx ‏593 KB

Dear GerdW,
I'm sorry again about the misspelling your nick.
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