Stop the motor (asynchronous) digital NI6008 input

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  Hello

  I am doing my school project and I managed to make the deepening of the engine via digital port of the USB-6008 by setting the Boolean value of output in a while loop with use cases, but now I faced a problem because I have to use it with a reflective sensor and stop the engine when he feels a digital pulse. The sensor is configured as a counter using PFI0 on the USB-6008 with a circuit that will send in a digital pulse for data acquisition.

  How to stop the engine when the detector reflecting is blocked, and then start the deepening again when it is not blocked

  Thank you

  The top spot is always implemented as a counter.  You must change the DAQmx create channel as a digital input and the DAQmx interpreted as a Boolean variable digital 1 channel 1 sample.

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  I use a SCXI-1000DC module with a module of the SCXI-1600, SCXI-1531 module and SCXI-1163 module to receive an analog of an accelerometer signal and a digital signal.
  I claim that the accelerometer is constantly monitored, and the output is on when I want to, by an impulse that I comand in labview.
  I use a rate 25 k and a 12, 5K samples per channel on DAQmx Timing.

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  I'm sorry for my English, and I hope you can help me.

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  Silvia

  Hello Silvia,.

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• Incorrect, test the results of the e/s digital PCI-6024E in MAX

  Hi all

  I have a problem with PCI-6024E. It is for the Commission alone OR installed on a target computer. First he just used OR-traditional DAQ (7.1, if I'm not mistaken) and it worked fine. Some time ago I installed NOR-DAQmx 8.7.1 on the same computer because it is necessary to run both programs written with NOR-DAQmx and NOR-traditional DAQ. As I know there is no harm to do both OR-DAQ and NOR-DAQmx on the same computer if they are not used at the same time. You can see the traditional under NOR-DAQmx devices and peripheral branches DAQ PCI-6024E jury in MAX. When I run the self-test, self-calibration or Reset Device, Max there is no problem. But Test panels (under the direction of NOR-DAQmx) has a rather strange behavior. When I press the "Start" button in tab e/s digital Test panels window with all the digital lines in input, the 4 first green indicators are on and the other 4 are not. And then nothing happens or I press the 'Stop' button or not. I have the same card as a virtual in my MAX on a development computer, and there is a different behavior of it (I don't have traditional DAQ here, just the same version DAQmx). During the entire procedure of test until I press the button 'Stop', the port State 8 lines constantly evolves so the Green indicators are switched on and off with different ways through all possible combinations of logic '1' and '0' in each line of the port.

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  Igor-

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• How to use Labview to control the motorized turntable?

  Hello

  I am new to Labview and do a project that requires the use of labview to control the motorized turntable (XYZ axes). I need to use the Labview programming and have no idea at all. Need help, thank you very much!

  Lei,

  Everything said by others is correct and to do because they describe, at a given time. But I always approached these projects of motion control first by looking at the 'motion controller' (I hope you have a) and 'drivers' (what you need) between the computer/LabVIEW and engines decide what communications will be required for these devices and get an idea of the syntax of command and the language to use with them.  In some cases, the controller and the motor driver are integrated in a single unit. Heck, in some cases, they are even integrated with each engine.

  The motors can be the stepper motors or perhaps servomotors.

  In the case of drivers stepper (devices that provide power electronics to run the engines), many of them are run using only two control signals for digital called 'step' (a pulse train) and 'direction' (high-low level) and if it is possible to generate directly with the PC, it's an order of magnitude easier (if you have not already a library of available motion control to manage the generation of these signals and) the execution of the stepper motors) of having a "Motion Controller" between the PC and the "motor".  Engine drivers step by step usually can be configured that current engine and the size of the stage and sometimes for the other plus-moteur/driver-parameter setting. The configuration of these can be made with jumpers, switches or, for some drivers, with orders ASCII on some sort of port of communication, but in general these are values you download the installer once at the beginning and then never touch again if you do not need generally to have a full time available on their change communication path.

  In the case of the actuator drivers (once again the devices that provide power electronics to run the engines), many use a +/-10V control input analog signal, and, again, while it is possible to generate the signal directly with the PC hardware, a separate axes controller is usually much simpler and more robust.  In the case of a servo system, there is also a signal back to an encoder or resolver attached to the engine to be used by any device will exercise the motion controller in the system.  There are once again associated with the driver configuration parameters (and controller in this case, since it is part of the servo feedback loop) which must be configured at the start but once set up properly, they rarely need to be changed again.

  A movement controller which is separated from the PC often manage several drivers, and can often coordinate a movement between them. It will load the rise up/down of the engine speed as that changes. It will be followed by position of each motor. The servo system, but it will take the feedback signal and use it to adjust the speed/position/torque of the engine. The motion controller also deal with race and home or index of signals is usually on most lines of movement and provide information of the State of the switch to the PC.   To run the motor controller is then just a matter of chaining a set commands of (usually ASCII) to indicate how fast to run and how far to go (and direction) and by sending a command "do it." Then, ask you to keep track of the status of the process and the States of the switches.

  In many cases the builders of controllers of movement are a primitive way to communicate with the controllers of a PC with no additional software other than what they offer. With this you can at least have an idea of how different the controller commands and responses they produce. That you can start to build sequences of commands to perform the actions you want.

  You can then add LabVIEW to the mix and to understand how you can get it to send sequences of similar orders on the paths of communication that are available and respond intelligently to the information it receives in return for motion control.

• Closed the motor current continuous Brushless PM and the loop speed control of Induction motor

  I need to implement the speed control of motors, asynchronous Motors PM Brushless DC and several other algorithms of cardiac control using LabView. It will take me 6-channel PWM and 6-channel 12 bit ADC, and a control movement of VI. Ideally a DSP would do the trick, but I would like to take advantage of the user-friendly interface of the LabView program to reduce development time. Please suggest the best hardware solution.

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  Kind regards

  Jochen

• back of the motor to the position in which he started?

  Hello

  I am writing an application to control a servo AC motor. It is based on reviews of couple. I use a state machine architecture. The result I'm aiming is,

  (1) the engine operating at a user specified speed and accel/break.

  (2) every time that the couple toggles between the upper and lower, limits the motor direction of rotation is changed.

  (3) at the end (the user specifies no. sometimes he should make this bike) the engine returns to the first zero position in which he started.

  (4) generates the data to the file and stops execution of the program.

  (1) and (2) have been supported. However, I'm still struggling with (3) and (4).

  What I have tried is to take note of the position of the encoder at the beginning of the program, and then after n cycles subtract aware of the position of him and give it as an input in State "Reset postion. Another thing I thought is playing with the tension (the departure of couple cell output voltage is always + 5V) so I thought to call the State "Motor Run" again at the end to move the engine to the original position. I tried some trial and error but am fultile in the efforts.

  No matter who may be likely to help the hand?

  Thank you

  Amandine.

  Hi Sasi,

  in case you have not found your bug by yourself, yet:

  After your state machine has entered the State of the 'RESET' POSITION you start a movement on the 0 position but you should not expect that the move is completed (this should be an additional State). Instead you immediately plug in "STOP ENGINE" and it stops moving without going back to the initial position.

  In addition, there are several things in your code that could be optimized (some examples):

  • By comparing a Boolean value as your STOP button with a constant TRUE is pointless, because the output is always the value of the STOP button. It's sort of a code of Rube Goldberg.
  • Your initialization state runs the same sequence of commands (displacement engine position 0) until button is pressed. There is a large number of redundant orders, sent to the Commission of control of movement.

  Kind regards

  Jochen

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  Hi datafriend,

  using what it says is correct:

  Or sample DI source clock: Any PFI, RTSI, HAVE sample or convert clock, AO, Ctr n out internal and many other signals sample clock
  The digital subsystem doesn't have its own dedicated internal synchronization engine. Therefore, a sample clock must be provided another subsystem on the device or from an external source.

  This means that if you do not use an external signal as clock you can use the sample clock to HAVE it on board or at the output of the internal counter.

  There are also 2 ANSI C examples in this regard:

  http://zone.NI.com/DevZone/CDA/EPD/p/ID/4485

  http://zone.NI.com/DevZone/CDA/EPD/p/ID/4488

  So in both cases you have to use a fictitious task you need only for the generation of the internal clock (HAVE or CTR)