pump tank control

[jamesanixon94@gmail.com]

Hi, I am trying a tank control VI but im having a problem when i stop the tank filling pump, the value of the tank is not held when going to the next frame if someone can point out my error, very new to this!

[LVIEWPQ]

Run your code, and watch what happens. 

Because your second sequence is initialised at 90 as the tank value, rather than reading the value, it jumps. 

[jamesanixon94@gmail.com]

Thanks I'll try this when I get home, I knew that was the problem I just couldn't spot where in that frame was causing it. Do I need to make a tunnel from the first frame to the second or will using a local variable do the job?

[altenbach]

Your problem is a seriously flawed program architecture. All you need is one outer loop, not a single local variable, and a simple state machine architecture.

Some glaring problems:

• equal comparisons with floating point values
• race conditions due to writing to terminals and reading from their local variable in parallel (e.g. storage tank 1 in the first inner loop).
• Learn about shift registers
• etc. etc.

I recommend to start with a few basic tutorials. Write down all the program requirements and what should happen as a function of time and user interaction.

[altenbach]

Try to understand the attached very simplified program. Maybe it can give you some ideas.

[jamesanixon94@gmail.com]

Thank you for this! I'll post an update when I have my program fixed!