electrika

QUOTE (martin@aerodynamics @ Aug 21 2008, 07:08 AM) Sorry ....here it is.

QUOTE (JiMM @ Aug 20 2008, 06:51 PM) OK jimm i'll remember that..thanks.... "Do you know about the context help window? Press Ctrl-h to bring it up, then hover over the subvi you would like to know more about. If the original programmer documented anything, you'll see more information about it in the context help window. 1. Based on the extremely limited information available, I would guess that this subvi sets the velocity of a given axis in um/s 2. Your guess is better than mine because you can see all of the code, but they appear to be global variables that are storing status information" Thanks tobyD ...I know about ctrl-h but the original programmer has not documented anything for this subvi . But there are no connections coming out of the subvi. so where is the value set by the subvi being used? QUOTE (mross @ Aug 20 2008, 10:43 PM) There is no way to tell what is inside a sub-VI by looking at its icon. You can find out for yourself by double clicking on the icon which will cause that sub-VI to open up for editing in LabVIEW, and any sub-VIs in there can also be opened up, and so on, until you have looked at all the under lying code. If the subVI has any output terminals you can add indicators to them to see what is produced by the subVI as it is run. The highlitghing button on the menu (a light bulb) of the Block diagram menu allows you to watch the progress of the program as it operates. These may help you understand what is happening. Thanks for your suggestions mross,...I have uploaded all the codes within this code...thanks again..

1)In the code below, I do not understand what is the function of V subvi? 2)Also in the second image what is the function of my global.vi and motion status , active status. I am sorry if this sounds silly, but I am kinda new to labview. Thanks

This is the code for the feedback loop! Hope that will help.

I use a Newport PM500C Precision Motion Controller....actually the Z motion of the system has a feed back system, there is a digital balance kept below and I am trying to maintain a constant(specified) weight. But the speed with which the motor moves down is different for different specified weights. But now I want to maintain a constant speed of the Z axis throughout irrespective of the weight specifed. I am thinking that an open loop will work for me in this case but I am not sure if it will affect the system stability. Sorry for a delayed reply. I hope you guys can still help me with this. Thanks. QUOTE (martin@aerodynamics @ Aug 19 2008, 08:17 AM)

Hi, I am trying to control the speed of a 3-axes system which controls the motion of a tool in the three directions. How can I control the velocity of this tool? I have an existing labview program to do this. But need to be able to change the velocity with which the tool moves. Is it possible to do this? Thank you for your attention.

Hi, Thanks a lot guys! will be back with more questions

Hello everyone I am an Industrial Engineering major working on a project for summer in a manufacturing systems lab in my university. The system which I am working on uses labview for controlling the motion of a tool along the 3 axes. I am trying to understand the system and later try to see what I can do to improve it. I have not really worked on Labview before so I do need some help...( hope you guys will be here!) My first question is I am trying to write the data generated by labview to an excel file. The thing is that I have two sources of data and I want to write the data from each source to two different columns of the same excel sheet. Since I am not very well versed with labview I am not sure if this is possible. How can i do this? Thanks!