i want to trend historical data from three analog inputs and five digital inputs using a daq 6008

[Joe McG]

I am a student undertaking a small project. I need to measure three analog inputs and five digital inputs using a daq 6008. I have created a vi in labview 8.5 and I can trend in the vi using a daq assistant. however I have found that while I can use several daq assistants to measure the digital signals I can only use one daq assistant to measure the analog inputs or I get an error. I therefore just added more channels to one daq assistant and that let me display three traces on one graph. However I need to use historical trends and alarms to show what the inputs were last week etc. I tried creating shared variables in a project but the analog inputs didn't work out for me. Is this the only way to show historical data? I am new to labview so your patience would be appreciated!

Thanks,

Joe McG

[Dennis_Knutson]

I'm not sure what the point of the shared variables is. Unless you have a lot of RAM and very little data, you will have to save the data to file and read it back when you want to view historical data. There are numerous shipping examples of reading and writing files. Give it a try if you run into problems, post back with details and include the code you've written.