How to make chart from multiple loops without local variables

[genak86]

Hi,

It is my first experience in LabView.

I did a program that communicate with Power Supply Device via RS232, sets an output voltage and read Voltage and Current in some sort of a program: Voltage goes up, staying in some value and then goes down. So there are many FOR LOOPS that sequensed one after another.

I need to make a 2 live Charts (one for current and second for voltage), and the only one solution that i could obtain is using local variables. BUT also I need to export my data to the file after the end of the program (with real elapsed time for collecting data points) and with the use of local variables I cannot do so. Maybe the Shift Register will work, but I could not make it work.

Thank you for help.

[Dennis_Knutson]

I can't look at your Vi since I am posting by phone but I don't understand the need for multiple for loops and why you cannot read both voltage and current in a single loop. When data exits a for loop, it automatically creates an array so you should have your timestamps and data readily available for a file write. You could also do a write as soon as you acquire the data.

[altenbach]

You have multiple, deeply stacked, sequential loops. Way too complicated.

All you need is a simple state machine architecture using a single loop and a single instance of your charts. No local variables needed. Simplify!!! You could even graph both values on a single chart.

Look at your code. It is basically repeating the same thing with slighly different inputs. You only need to change the inputs based on state, and re-use the same IO function instances. Only one instance each needed.

(you also have some misguided autoindexing near the middle of your code. Bad!)