Using FieldPoint to control step motor

I am having problem positioning a step motor. Here is what I am using.
Step motor 200 stp/rev. with a 500 line quadrature encoder
A SS2000D6 SLO-SYN Drive
Field Point FP-Quad-510 for the encoder
FP-PG-522 for the Pulse generator
FP-DO-403 for signals for the SLO-SYN drive
FP-DI-330 for digital input signal for switches
I am able to drive and control the speed and direction of the step motor also display its position. But I am having problem when I want to move a position and stop. I can see the counter working when it reaches the number I want to stop it flys by. If I slow down the step motor way down the encoder moves so low it counts in batches of 2 or 4. Does any one have an idea what can I try or do.

Hello Toro,
It's good that you listed all of your FieldPoint hardware, but which of it is relevant for this issue. From what I can tell, and please do correct me if I'm wrong, is that the FP-Quad-510 and FP-PG-522 is of relevance. You determine the location you want it to move to, and you then start the pulse generation according to the reading from the FP-Quad-510. Is this correct? The problem isn't the quadrature encoder measurements, but the pulse generation.
Does the position change ever stop? How do you currently have it programmed such that it knows to stop at a certain position. There is a command used for the FP-PG-522 which will stop it's pulse generation immediately or on its next pulse. Page 8 of the FP-PG-522 Operating Instructions read:
The Control command supports two actions: Stop Immediately and
Stop After Current Pulse. Both of these actions can stop a finite
pulse train. Stop Immediately stops pulse generation immediately.
The channel goes into the idle state, and, if the output for the target
channel is on, it is turned off. Stop After Current Pulse ends the
current pulse train after the current pulse is finished.
=====
Let me know your thoughts, questions, and comments.
Jared A

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Assigning digital port to control stepping motor

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Answered on your other post.

Control step motor explanations

Hello,
I would like to control a step motor with computer through a cRio solution and a module: NI9512
I already saw what can be requested for the experiment:
A controller Ni cRio 9073, in order to plug the module
A power supply 24VDC
Step motor
Nevertheless I noticed that I could also have needed a Step driver (like the P7000). What is its role? What the difference between the Step driver and the module NI9512?, Does I required the both ?
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Regards

Hi,
one 9512 provides connectivity for one stepper axis. The same is true for the P70530 drives.
Using the drive interface modules is probably the most reasonable method to drive stepper motors with a cRIO system. It requires no FPGA programming and provides a very easy to use API (NI-SoftMotion). You may want to have a look at how to configure and program such a system in this short webcast.
Of course you also could use digital I/O modules and FPGA programming, but this would result in significantly more work. With the drive interface modules you should be up and running in several hours (including cabling and configuration). With the manual approach the setup could easily take several days to weeks (consider extensive testing and recompiling of your code). If you need to meet very special requirements, this is still worth the efforts, but for standard stepper motion control tasks I strongly recommend to use the drive interface modules.
Kind regards,
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LabWindows/CVI Developer Newsletter - ni.com/cvinews

How to use sinewave to controll my motor run automatically.

Hello
I am now tring to use a waveform(sinwave ) to control my motor run automatically .I am using labview2010 and EPOS50/5. Is there anyone can give me your suggestion? Thanks in advance.The attachment is the program for my epos.
Attachments:
epos and sinewaveform.vi ‏34 KB

PS: My program for epos can work, but I don not know how to combine the sinewave program with the epos program to make motor run automatically.
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http://www.ni.com/pdf/manuals/373060e.pdf

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Controlling XY table using a stepping motor

Hi all,
I want to control an XY table using a Lang MCL 2 stepping motor and for that I'd like to use a pre-made toolkit instead of programing all using DLL's. Any suggestions?!
Best Regards,
Seno

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Attachments:
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Hi, I'm really beginner on labview and I need to make a VI to control a step motor. For each n steps, a sensor must observe the position of a mechanism and save in a table based on the number of steps taken. I've already have the sensor's driver, but I don't know how to comunicate labview with the step motor.
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I have a PHI TRIFT3 ToF-SIMS instrument. The instrument comes with a default
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"We do not use special driver for control the step motor.
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module(wave form card) via PAHOST card(installed in ISA bus slot of the PC)
to passthru the RS232C command to stepper motor control unit.
If you try to talk to step motor. just send the RS command from Labview
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Just to start from scratch, have you verified that you can do basic communication with your serial port, ie successfully perform a loopback test? Please let me know, and we will go from there.
Logan S.

Best way to optimize the readout of a photodiode using motorized stepping motors?

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Hi all,
I am trying to control a step motor to move in vertical direction by Labview2010. The specific Labview function blocks are created by the manufacturer of the step motor. Now the axis can move up/down properly but my question is that I want it to move with a time interval. For example, we set the desired position to 10mm and waiting time 1s. When I click on the start button once only the axis moves 1mm and wait 1s. Then axis moves another 1mm and wait 1s. This action will obviously repeat 10 times until the axis reaches 10mm position.
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Best regards,
Nicky
Solved!
Go to Solution.

You're welcome
You should some more to the code so that it's more reliable. There might be some miscalculation between the travel distance and the resolution, i.e. 5mm travel and 2mm resolution will give the forloop 2,5. This should be either 2 or 3. I'm not quite sure how the for loop handles this. I think it will round to nearest. You should anyways check it out. Also avoid using 0mm.
Good look with your project
Regards,
Even
Certified LabVIEW Associate Developer
Automated Test Developer
Topro AS
Norway

Using FieldPoint to control step motor

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