I tried to solve the problems to the existing solution in this forum. I still get error 50405

Dear,

I use USB-6009 for controlling pumps, valves, and two Mass Flow Control. Each two cycle I get error 50405. I tried to solve the problems in the existing solution in this forum, but the error always showing each cycle 2 of the operation. I enclose my VI filled for the expertise, I was wondering if its design issue? Home shot of the error screen. Thank you.

You have certainly a few design issues.

The structure of stacked sequence tends to create more problems than it solves. I the have not used in new programs since version 1.2 of LabVIEW (in 1989). A state machine is a much better choice of architecture.

Local variables can cause race conditions, copies of additional data, poor performance and it is difficult to debug code. There are special cases when they should be used, but these conditions are not in your code. Just wire directly on the terminals of control at the scene, the data will be used.

My guess on the likely cause of your error is the use of several DAQ Assistant to perform the same task (with different data values) in each image in the sequence structure. With the arcitecture state machine that I suggested above, you would need one. The DAQ Assistant trying to be clever on the configuration and tasks of closing, but different instances do not speak with each other, so they don't know when to release the resources.  You might be able to do work if you used the DAQmx screw standard you have done with the task of digital output.  You do not connect the error lines of the DAQ Assistant for you can be missing errors.

Indicators and controls without legend may be a troubleshooting nightmare. Please give each control and seeing a unique label. If you don't want the visible label on the front, you can use the properties of the control to hide. If you want multiple controls to have the same visible text for the operator, use the legend.

Learn how to use subVIs. Most of the code in the 6 images of the structure of internal sequence is identical. By converting only a Subvi, you would reduce considerably the size of the diagram and if you ever need to modify the code, it should only be changed in one place - the Subvi.

The while loop in frame 0 of structure of outer sequence is a "gourmet" loop He's going to run as fast as possible and seize all available CPU resources until the user presses a button. Put a wait function (ms) in the loop with expectation of ~ 100 ms. best, learn how to use the Structure of the event for user input.

The second loop inside of the structure cases inside does nothing and can be removed.

Many of these objects suggest that you have a programming background using the text-based programming language.  LabVIEW uses a paradigm of data flow that avoids largely for things such as the structure of the sequence and the local variables. I recommend that you work through the tutorials online on the Getting Started with LabVIEW.

Lynn

Tags: NI Hardware

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