I am having touble logging alarm status in labview

Question

I have written a vi that reads information from to data aquisition boards and compiles the info into a 1d boolean array(1x16) for its analog inputs and a 2d boolean array(9x23)for its digital inputs, I use a for loop and a case structure to index the arrays and return an alarm text if any of the booleans go HI. I want to display the alarm text on the front screen for each alarm that is Hi as well as save to disk and print. I have too small problems with my vi. Any alarms after the first one overwrite previouse alarm instead of adding to the current alarms, as well alarms continusly update making it impossible to save them as it would save every time the program cycles, I guess what I am asking is the
re any way for the alarm status to be updated with each new alarm only and not updating untill it finds another change of state.
thank you for any help or ideas
drw

Answer 1

For the alarm output, you can use shift registers and replace values if an alarm goes HI, letting the array pass trough if not. This way, only data passing to HI will write to the output, and won't overwrite it. You can save data everytime a bool goes high, so that only this makes data be saved. Attached there's a vi that gives some idea of what i mean.
Hope this helps
Attachments:
alarm.llb ‏46 KB