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KB85576
PAC Display Runtime: Historical Logs may miss data if another trigger event occurs too quickly
Revision:  2.0
Published:  3/23/2016
Applies To
PAC Display Basic
PAC Display Professional
Versions
Versions affected:  
R9.4a through B9.4h (prior to February 23, 2016)
Problem is fixed in version:  
R9.5a

SYMPTOMS

If the trigger for a trigger-based historic log occurs too quickly, PAC Display Runtime may miss subsequent activations of the trigger, resulting in no data being logged.

WORKAROUND

Try using a different value to set the trigger each time.
One way you could do this is:

  1. Configure the start trigger to be < > 0 (meaning "not zero").
  2. In your PAC Control strategy, add a new 32-bit integer variable that gets incremented each time you want to set the trigger again.
  3. Next, add a step that checks the new variable's value. If the value is 0 (zero), set its value to 1 (one).
    This step makes sure that the new variable never equals zero (which is the non-triggered state).
  4. Finally, move the value of the variable to the variable used by the start trigger.
    Now, each time the trigger is set, it will be a unique value so that Runtime will know it's a new trigger event.

And here is an example of this logic in OptoScript, where nStartTrigger is the start trigger 32-bit integer variable and nTriggerCount is the secondary 32-bit integer variable used to increment the value that gets moved to the start trigger.
 
    IncrementVariable(nTriggerCount);
    if (nTriggerCount == 0) then
      nTriggerCount = 1;
    endif
    nStartTrigger = nTriggerCount;

RESOLUTION

Opto 22 has resolved this issue.

Relevant Downloads
No relevant downloads have been specified.
Questions? Contact Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com

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