Getting a numerical value to change with time

Hi,
I'm trying to control a bunch of relays connected to a NI 6008 and 6501 unit. I've got a program which can take a binary coded decimal code and turn on the appropriate relays for that code but I'd like to automate the system to free me from keeping an eye on the clock and changing the code as necesary. As such I was trying to get the program to reference a spreadsheet each iteration of the loop, however this returns an Array which I can't seem to find a block which will pull the value I require out. I then tried making a waveform replicating the on/off cycle of the relays with no joy at pulling the value of the waveform at each time step out and giving them to the microcontrollers.
I'm sure there must be a simple way that the program references an array/speadsheet/waveform and gets the value out at the specific time but I can't seem to find it!!
The number is a double, 64bit real type.
Sample data would be the number being 0 for the first 40seconds, ramp up to 7 in the next 10 seconds, hold that for 20 seconds then ramp back down to 0 in a final 10 seconds.
Any clues or suggestions would be very much appriciated!!
Cheers,
Stuart
Solved!
Go to Solution.

You've mentioned a few different things there.
The attached vi is one suggestion of how you could generate the waveform you described.
Troy
CLDEach snowflake in an avalanche pleads not guilty. - Stanislaw J. Lec
I haven't failed, I've found 10,000 ways that don't work - Thomas Edison
Beware of the man who won't be bothered with details. - William Feather
The greatest of faults is to be conscious of none. - Thomas Carlyle
Attachments:
gen_ramp_waveform.vi ‏13 KB

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Hi Purvesh,
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max(fcr.actual_start_date) = here I am getting date with time (for eg :9/4/2012 6:47:49 PM)
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YOu are losing the Time information while fetching the data into a VARCHAR2 variable. change the datatype of v_date to DATE and get rid of the TO_DATE logic in cursor and simply use v_date variable.
Message was edited by: PurveshK misread.

Getting a numerical value to change with time

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