Write a Labview program to control both speed and direction of stepper motors

Hello,
I am currently undertaking a project in University. As part of it I have to run two stepper motors at varying speeds, and one of them in forward/reverse. The motor I have for the project is a RS 191-8334 (V9728) and the controller is a RS 240-7920 (v10900). I have no experience of using Labview, and the version I have on my laptop is Labview 10. Any help would be greatly appreciated.
Ideally I would want a program to do both full/half steps, forward/reverse, have speed control and be able to control the number of steps.

Hi Wef,
I would need to know more information about the devices in order to assist you.
What inputs does the stepper motor controller require and what hardware are you using to supply the required signals to the motor.
Best regards,
Stephen C
Applications Engineer

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Labview Program will hang between 33% and 50% of the time.

I have a problem with a Labview program I made. I have two programs that do the same thing. One is in flat sequence form and the other is in state machine form.
As explained in the link below, I would like to make use of a microcontroller to make wiring connections for automating a measurement process. A separate current source and volt meter will be used.
https://forums.ni.com/t5/LabVIEW/Sequence-a-good-idea/td-p/2601333
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Hall 1.3 simple.vi will work the first time and hang the second time. So it works 50% of the time. This one is in State Machine format. This one will hang at the case titled "Measure 1" which contains the Keithley 6517 Single Read.vi.
I've used the highlight execution button and watched the program run. Oddly, it doesn't hang when using this button. So I tried adding delays/wait in different places to no avail.
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Solved!
Go to Solution.
Attachments:
Hall 1.2.vi ‏42 KB
Hall 1.3 simple.vi ‏81 KB

altenbach wrote:
SaintsFan wrote:
Also, I've tried placing wait/delays at various places with no improvement of the problem. My next thought is to just remove all the vi calls and have everything in one program.
How did you place the waits?
Why would placing everything in one program fix the problem. That makes no sense! What is your reasoning?
In the case of hall1.3, I placed a wait in the Measurement cases and CS On cases and there was no affect. In the hall 1.2 when the blocks were broken up similar to the state machine cases where each sequence window was identical to the cases, I placed a wait or delay in each window with no effect on the hanging.
My reasoning for placing everything in one program is the same as my reasoning for figuring delays would help, since the time of execution would be altered. If the execution time is faster and if the timing is the problem then I figured that the problem would happen more frequently or even every time.
Somehow I get the feeling this is not the case. The reason being the interval in which it succeeds or hangs is constant. I believe somewhere, a value is getting set. The 6517 Read vi runs fine if I run this vi by itself no matter how many or how fast I run it. Also, the same goes for both 1.2 and 1.3 if I remove the 6517 read vi they run fine no matter how fast or how many times I run them.
Somehow after the current source is set to operate and triggers labview will hang on a set interval when calling 6517 read vi.
Separately they work, together there is a problem. I tried placing a delay between these two by connecting the error out of the trigger vi to the error in of the delay block and the error out of the delay block to the error in terminal of the 6517 config block. I've also tried delays between other blocks connected the same way. From what I understand, a called vi can't execute until all inputs are present. Is this the correct way to wire the delays?

Control of DMX J SA 17 stepper motor in Labview

Hi,
I'm trying to build a simple program to control an Arcus Technology DMX J SA 17 stepper motor via USB. I'm basing my program on the example which Arcus provide on their website, and which I attach in an llb (the program is demo.vi, the rest are sub vi's).
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NI-488: Command requires GPIB Controller to be Controller-In-Charge."
The error is confusing because the control mechanism does not use GPIB hardware or commands, also the VI was made by Arcus and I would have expected them to handle the formatting of the data inputs correctly.
Any help would be much appreciated
Dan
Attachments:
PerformaxLV_v102.llb ‏500 KB

Hi Jack,
Thanks very much for your help. I've managed to complete the VI now, working as was intended. The principle problem came from trying to use demo.vi as a standalone - it turns out all the vi's in the .lib are sub-vi's apart from utility.vi. This was of course, not at all clear - and I've emailed Arcus recommending that they includ some descriptive documentation with the .lib download.
What was happening was that demo.vi was trying to send commands without having first established a communication channel, which is done by two other sub-vi's in sequence (device selector and open device). Also, once communication is established, the motor needs to be sent the command string 'EO=1' to be enabled.
I attach the final vi I made 'motor control' and the sub vi library, incase anyone working with the same hardware finds them usefull.
Thanks again,
Dan
Attachments:
Motor control.vi ‏92 KB
PerformaxLV_v102.llb ‏449 KB

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Desperate user need help. My GPIB instrument get stuck with my labview program frequently

Hello to all labview users,
i am a beginner in using labview. I am currently writting a labview program to automatically control a digital control rotator HD201e and a network analyzer 8720a to work with the anechoic chamber. The program receives an initial position, amount of increment and # of steps. My program will then ask the controller to rotate to the initial position and at the meantime, the program will monitor the position of the rotator to ensure the requested position is reached. After that, at the position, the program will ask the NA to perform a reading of the measurement. Once the reading is done, the program will ask the controller to rotate to the next position and does a reading of the measurement and so on.
My program seems to be able to perform the tasks; however, the dig.controller part seems to get stuck around 50% of the time when running the program. Sometimes, even the controller receives the requested position (can be seen from the lcd screen of the controller), the rotator just simply would not rotate; also, sometimes, the controller just simply does not respond when sending the command of moving a position, as in the debug mode (the one with a lightbulb), i see that i got "ok" on all the blocks in the writing portion ofthe program, but the controller just doesnt seem to receive the position (as seen no new position received from the lcd screen) and the cursor on the lcd screen blinks weirdly, due to that problem, my program will then get stuck in an infinite loop.....
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I have also tried putting "clear" block before and after the "write" block.....same problem.....
I have heard that the serial GPIB "flush" block may help...but i tried..but it seems the controller doesnt recognize/accept flush....
i have also tried using the "Visa open" and "Visa close" block to see if ithat reduces the stucking thing....but seems that the controller can still get stuck....
i have also even tried using "lock asyn" and "unlock asyn" block...but didnt seem to work....
Has anyone experienced such problem.? Is it a known problem with some gpib instrument?
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PS: i attached the controller part of my program and the overall program
desperate happyguy......
Happy guy
~ currently final year undergraduate in Electrical Engr. Graduating soon! Yes!
~ currently looking for jobs : any position related to engineering, labview, programming, tech support would be great.
~ humber learner of LabVIEW lvl: beginner-intermediate
Attachments:
HD201_Controld.jpg ‏231 KB
AChamber_Measurements_v1d.jpg ‏857 KB
AChamber_Measurements_v1d3.jpg ‏463 KB

hi xseadog
i got what you meant about the gpib reference
actually, that final frame works because the gpib reference is already done inside that subvi.
but my problem doesnt arise from that. most of the time ive seen, it arises between the writing frame and the while loop frame. as i mentionned, sometimes. the controller just simply doesnt rotate even i can see the requested position display on the controller lcd screen; also sometimes, just the controller is stuck without acknowledging the write position command. but in labview...while in debug mode. it is shown ok on the block.
Happy guy
~ currently final year undergraduate in Electrical Engr. Graduating soon! Yes!
~ currently looking for jobs : any position related to engineering, labview, programming, tech support would be great.
~ humber learner of LabVIEW lvl: beginner-intermediate
Attachments:
HD-201 RPosd.jpg ‏39 KB

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Attachments:
Front Panel with error message.PNG ‏202 KB
Block diagram.PNG ‏101 KB

Hi
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