OBD II enhanced PIDs with a/d converters

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• Topology line EtherCAT with fiber/fiber converters

  Hello

  I have a request where I will order several NI 9144 slave chassis in a line of a master cRIO topology. The chassis must be 10kV + isolation from each other and the captain so I'll use converters of fiber on the link ethernet between each frame. The lengths of links are relatively short)<>

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  I'd better be using using standard Ethernet with NI 9149? I can cope without the deterministic calendar.

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  Richard.

  Hi Richard,

  The EtherCAT protocol normally works on 100BASE-TX and can also run on 100BASE-FX (Sources here and here). I'm guessing that you have seen the KB that explains that you need for different cheating / hubs for EtherCAT and makes you wonder if the optical converters fall into this same category?

  The need for special switches / hubs is because EtherCAT junctions stars work differently that normal Ethernet as the packages hubs need a particular routing. However, optical converters online and do not affect the sense go packages. They are just bit conversion of the tensions light pulses. The main thing to consider would be how much latency converters to introduce network - as this will eventually affect your EtherCAT minimum cycle time.

  That said, NEITHER does not test the optical converters, but I've heard customers who use optical converters before (link sorry, not turned to the audience of reference available). As I mentioned above, the EtherCAT protocol specify how 100BASE-TX and 100BASE-FX, so I'll make sure the converter is in conformity with these standards.

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  pman216

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• I use the full version of DASYLab 8.0, how to add PID module in the design of the façade (window layout)? while I can vary the p, i, d values in the window layout

  I use the full version of DASYLab 8.0, how to add PID module in the design of the façade (window layout)? while I can vary the p, i, d values in the window layout

  To do that you will need to change the varibles PID values and then use the sliders to add numbers to a latch for variables that point.

  This is how I think it works in Version 8.

  In all cases, you should move on to 12 more stable summer.

  In addition, unless that is a very slow process, I generally do not like closed loop PID with DASYLab due to the fact that computers is not reliable with timing.

• where are the screws of PID

  I can't understand how to install controls PID with Labview 2009.

  What part of the list of the products installation run to get these screws

  We have the full license of the site which is available to academic institutions, we should have it I think.

  The only computer I can find the screws on is an older computer that run labview 8.6 and vista.

  Yes, thank you.

  The problem I had turned that PID controls were on a different CD.

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• Synchronization of multiple FPGA PID loops

  Hello

  I am the design of a PID controller for each of the three axes (X, Y and Z) of a piezoelectric stage using the FPGA module and a cRIO. I used the example of project "Using Discrete PID - cRIO.lvproj" (labview\examples\control\pid\fpga.llb\CompactRIO) as a starting point and I've basically added two PID loops more on the FPGA VIs to the other two axes. I can get the controller to work for an axis at the same time (in simulation mode), but whenever I try to run all three controllers simultaneously, only one works. In order to synchronize between the host and the FPGA VIs, I used three interruptions for each PID loops, but it seems that a single interruption works when I run the code... No idea how to synchronize the three loops of PID with the host VI?

  Kind regards

  Shin

  I think that it is an expected behavior, by the documentation: "VI the interruption is a shared resource, so multiple uses of it induce a further delay and jitter due to arbitration." If you are waiting for the interruption to see, then the other loops cannot continue because interruption VI does not work. On the FPGA if you want all the PIDs to operate at the same speed of loop, put them all in the same loop and use only a single interruption. Or use another synchronization mechanism (set to a boolean of the host, wait it is defined and then erase it on the FPGA). The interruption is only for purposes of simulation, in any case, since the 'central' is running on the host computer. In a real system, the plant works continuously and FPGA directly reads the sensors and outputs, the readers so the only value provided by the host is the set point and is not required for synchronization.

• How to connect Labview to PLC Modicon Quantum (140 CPU 311 10) with Modbus

  I was wondering if someone could give some tips on how to connect Labview to Modicon Quantum plc (the card is 140 CPU 10 311).  I am eager to serve a Labview HMI to control the controller that is used to implement the control PID with a VFD.  Currently I can communicate via Modbus to the API for programming using UnityPro XL, but I have no idea how to connect Labview.  I read the article on place OR "connect Labview to any PLC via Modbus", but I don't know yet.  Any help will be greatly appreciated.

  Hey Greener.

  Communicate with the PLC via Modbus usually requires the Datalogging and Supervisory Control (DSC) Module to have this feature available in LabVIEW. The white paper which indicated you using this module, which may explain why you can't get the communication at work. If this is something you don't have, and purchasing a license is not an option, then you might be able to use Modbus unofficial libraries to get the functionality you need. I have included a link below to a Modbus for LabVIEW library that you can try.

  DSC module:

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  Modbus Library:

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• PID motor problems

  Im having trouble with an application of linear motor control.  I'm using a servo-motor/converter to power a linear drive.   The player is running in current/torque mode so that the output power/force is proportional to an analog input that is sent to him (no setting parameters).  For this particular application, Im using the express vi 'set up fake signal' to create a waveform of sin that is used as the target value then inturn helps determine the voltage sent to the engine and thus, out of power.  The tension of a load cell is then read through PCI-6014 and convetered at a level that can be compared with the output of analag, scale factor for the torque mode.  There is also a PCI-6601 used to determine the position, but should not be relevant here.

  Without PID.     Using a load cell, I see that the wave of fishing is truncated at the top and bottom, it rises to fast in response to the tension and then from the trays.  The reverse happens when unloading and it reaches a low load to soon and there is also the truncation. I will attach a figure which can demonate the problem better than I can explain it.

  

  Without PID.   This isn't a saturation effect, but as I can raise the amplitude of the input voltage and the force will follow the same type of waveform, but again the load levels.   Ill. attach a screenshot 2 new levels of load of 2000lbs.

  

  I can look at the levels of current/voltage output of the command servo which feed the linear actuator and that they are the sinusoids perfect, after all what is the input voltage, if guided by PID or not, its a mirror right, without truncation as occurs in the above figures.   There is also no problem of speed or acceleration, it is well under the speed limit, that this system can work, IE under 0.25htz and it can run 50htz to these displamcements.  So, these are not the problems.

  As I understand it, the PID is commonly used to correct this type of problem and is standard with machines that need to produce force in this way...  Infact, I learned from the people who make the drive I use to fix this type of problem.   Yet, Im could not get it to work. I tried to change the P term accoring to the N? I have the document below and dosent seems to correct the loss of crete, so Im doubtful the I terms or D will do much (and have tried without success). I'll attach a third screenshot and link in the general guide for the PID below

  http://zone.NI.com/DevZone/CDA/tut/p/ID/3782

  with the PID, with P increases so some departures of instability

  

  Ive tried reinstallilng labview on a different computer, with PID and get identical results.

  I'll join the code I help him, not that I'm waiting for anyone to find, its big enough.

  Any help is greatly appreciated.

  Jimmy,

  If your control loop does not work with a deterministic timing, the highest rates of change of the setpoint to the situation, so the quality of the control loop also limits the frequency of your sinuses. However, the loop itself is always on to 2 kHz, so the loop time and jitter of the same order of magnitude, then it will be very difficult to get a system of stable control with this configuration. Reduction in the rate of control loop is also not a solution, because the linear motors are very dynamic systems, requiring control loop series kHz.

  To improve the situation with your current setup, you can always try to better structure your vi, delete dynamic memory allocations and so forth, but the improvements will be very limited. In fact, there is a reason why NEITHER a lot of success with products such as LabVIEW RT or compactRIO and the reason is the deterministic behavior of these platforms that is required by the dynamic closed-loop control applications.

  To answer your question on the amplitudes: regulator PID tried to generate an output signal, which translates as the set value - PV = 0. So for example, if your load cell outputs 0.5 V/N and you want to generate a force of 10 N, the set point must be set to 5. In other words, the scales of the setpoint and the PV must match, but this does not mean, you must necessarily across the PV before you go to the PID controller. Instead you might evolve set points to map to the copying. The advantage of this approach is the fact that you don't have to do calculations online on the feedback signal, because you could precalculate a set value table before you start the move. This approach would calculate you your calibration data in the matrix of setpoint values.

  If you follow this method, you might also think of using a control chart of standard movement as a PCI-7352. This Council deals with all onboard, real-time control tasks so no LabVIEW RT is necessary and you can move the locker bays precalculated in the memory of the Commission (contouring mode).

  I hope that gives you some ideas how to proceed from here.

  Kind regards

  Jochen

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  I have the HP Laserjet 4100 printer. I bought a new laptop with USB ports.  What type of printer cable I need to connect the printer to my laptop? Is there some kind of printer cable adapter, or something else that will do the trick?

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