Question about Val(Sgnl) property

Hello,
I am reading data from a telnet connection as 16-bit binary values. I strip individual bits of that 16-bit word to light up indicators. For each indicator that I light up, I want to have an associated 'history' indicator, that would show if it lit up, then went dark at some point (i.e. like an overnight test).
To achieve this, when I assign a value to a given indicator, I send that same value to that indicator's Val(Sngl) property. Then I have an event structure that simply sets the 'history indicator' true whenever there's a Value Change in that Val(Sngl) field.
OK so my problem is that I must not be understanding what constitutes a value change, because what's happening is that when there is an error on any indicator, ALL of the history indicators are lighting up. The VI is large and complex, so instead I attached a picture that shows the important parts. Notice on the left I mask out individual bits, then on the right is where I light up the indicator based on the Value Change property. I've only shown one here because they are discrete but the code is identical...if the respective error bit changes value (low-to-high or high-to-low), then light the history.
So as an example...if G_LOL Summ goes active, the history bits for all 5 indicators goes active.
I put probes on the signals that I don't expect to light up (i.e. probe #18 at the bottom of the picture on the left)...it stays "false" the whole time (i.e. value doesn't change), yet it's history indicator comes on.
Any thoughts? Thank you
Solved!
Go to Solution.
Attachments:
labview.png ‏63 KB

bmishoe wrote:
that's an excellent idea because the event structure 'value change' options by default include New Value and Old Value...I can just check to see if they are = and if not then set the history bit true. Great idea!
Or, to avoid extra code, you could check to see if they are NOT true equal and use that output as the value for your history bit.
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

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