Configuring the PID (FPGA) Express VI

Hello,
I'm implementing a control system using the PID (FPGA) Express VI. I was wondering if crucial to provide the correct sampling time: Does the Express VI's functionality depend on it, or is it only for calculating the initial quantized gains?

Hi there, The sampling time directly affects the integral and the derivative gain (see the formula at the details section over here). Unless you are doing a proportional control (only) I don't see a problem. For more reference check this other link.
Alejandro | Academic Program Engineer | National Instruments

Similar Messages

Where is the PID (FPGA) Express VI?

I have LabVIEW 2013 RT and LabVIEW FPGA installed on my Windows 7 machine. Which palette is the PID (FPGA) Express VI on? I have looked on both the RT and the FPGA palettes. I have looked for the example C:\Program Files (x86)\National Instruments\LabVIEW 2013\examples\control\PID\fpga llb\CompactRIO. The example is not on my machine.

I don't have an FPGA Math & Analysis -> Control on 2012 or 2013. Maybe I failed to load everything I need. Here is my palette.

PID (FPGA) - Convert 16bit output to 24 bit

Hello,
Im controlling a device in Closed Loop using the PID (FPGA) vi. The output of this is I16, but it would be nice if I could convert it to a I24, or I32. The output of this vi is sent to two different Analog Outs on my Op-Amp circuitry. The op-amps are set up as summing amps, so it would be ideal to send the lower 8 bits to the first AO (fine output), and the top 16 (15+sign) to the second AO (coarse output).
I haven't found an easy way to do this yet. So far, I've been thinking of just using the I16 output value, split it into two 8 bit numbers. The lower 8 bit controls my first AO. The upper 8 bits is combined with another 8 bit register that gets incremented everytime the 8-bit number becomes saturated, and controls the 2nd AO.
I've attached a pic to make it more clear (I hope?). If I should be doing this another way, please let me know.
Or maybe I need to be controlling this system with 2 parrallel PIDs? One controlling the coarse control, the other the fine. The feedback would be the same for both PIDs.

Hi bones,
even on FPGA you should be able to use "split numbers" and "join numbers" functions...
And you can use boolean operators on numbers. Like sign = I16 && 0x8000
That way you would get away from all those number TO boolean array TO cluster of booleans TO unbundle TO bundle TO boolean array TO number conversions (also called RubeGoldberg, search for this in the forum!).
Message Edited by GerdW on 12-07-2009 08:52 PM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

I need help configuring the Airport express from a PC

Hi there!
I want to configure the airport express from a PC. It runs okay but the connection is open (anyone can browse on my connection)
In a PDF that I found on Apples web site, it says go to
Start-> All programs-> Airport express setup assistant, but there are no programs named Airport on my PC!
Do I have to download a utility for this purpose?
Fredrik

If all you want to do is add wireless security to an already configured Express, you'll probably want to use the Airport Admin Utility. You should be able to install it by installing this package:
http://www.apple.com/support/downloads/airport42forwindows.html
If the PC isn't running at least Windows XP, I think you're out of luck.

Configuring the time capsule airport wlan function as "connect to wlan", the time caspule gets a correct IP adress from the other wlans IP range, but does not assign this to the ethernet ports. With Airport Express it worked!

Configuring the time capsule airport wlan function as "connect to wlan", the time capsule gets a correct IP adress from the other wlans IP range, but does not assign this to the ethernet ports. With Airport express it worked, the single Ethernet port got the IP Parameters passed through!
My setup is a Vodafon Esaybox connected to ISP. Time Capsule is not able to extend the wlan of the easybox, neither airport express can do.
Only the option "connect to wlan" is succesful.
With airport express I was able to connect my Sony Bravia TV to the lan via ethernet to stream pictures, the TV set got an IP adress from the easybox.
With the time capsule the easybox dosn't find devices connected to the ethernet ports to submit IP adresses. The TV set get another IP adress (169.xxx.x.x.) in subnet mask 255.255.0.0 and I don not now where from.
My notebook is a MacBook pro.
Any idea????
Thank a lot in advance!
Kind regards
Ingo

Neverthe less, could there be the chance, that this feature could be implemnented with an firmware update?
That would appear to be a question for Apple to answer. You can make suggestions to Apple here:
Apple - AirPort Extreme - Feedback
If the AirPort Extreme and Time Capsule are configured to "extend a wireless network" they will provide additional wireless coverage....and...the Ethernet ports are enabled in this type of setup.
The "catch" here is that you must have an Apple router providing the network to be extended.

Cannot configure the Airport Express

I connected my Airport Express to my router (not an Extreme Base station). I got the solid green light, I can see the network wirelessly and I can access the internet with no problems.
The problem is that I cannot access the Airport Express in order to configure it (I want to add some filtering and some additional security). The Setup Assistant is searching for an Extreme Base Station which it cannot find (since I do not have one) and so does the Airport Admin util.
Is there a way (or perhaps a different configuration utility for Win XP) to configure the Airport Express?
Thx
Windows XP

Thanks for the help. I was out of the country for a few weeks but now I am back trying to resolve the problem. Nothing helps, the Airport Express "insists" on the fact that it cannot find a base Station. I am not sure what else is there to do and I am closed to go back to my old 802.11b D-Link wireless router. Do you have any other idea that may resolve the problem?
On another note, why does there have to be any connection between the Airport Express and any base station? Why can’t I configure the Airport Express without being connected to any basestation?

Configuring the reference power (dB) in the Spectral Measurement express VI

What is the reference power (dB) or pressure in obtaining the dB FFT response from the Spectral Measurement express VI? We need to obtain the SPL of a cellphone speaker and SPL is measured when the reference pressure/power is 20uPa or 1pW.... The data result is in negative dB but we need to have a positive result. Im thinking that maybe the reference is at 1mW..

You can convert Express VIs to regular subVIs. Then open the block diagram and look at what they have done.
In this case when you get six levels down into subVIs you find one called ma_Convert to dB.vi. It has inputs for dB reference for ch X and ch Y. The default values are 1.00. These inputs are not wired in the SubVIs of the Express VI.
To change the reference FIRST Make a Copy if the converted Express VI with a new name. Put it into your project, not in vi.lib. Similarly, make copies with new names of any subVIs you need to change. Then make the changes you need on these copies. Document those changes so anyone looking at the code knows why the standard Express VI was not used and what the differences are. Put the changed VI in your main VI and get the SPL values.
Lynn

Will I be able to extend a dual band network from a Time Capsule 2nd generation with the new Airport Express on both bands?

My Time Capsule 2nd generation is the main accesspoint in my house. It resides on the second floor in our living room. On the first floor in our kitchen I have an fairly new Airport Express that extends my network on the 5 GHz band and allows me to stream music via Airplay. I had to choose 5 GHz since the 2,4 GHz band is interfered when using the microwave oven. However, we have a rather old house with loads of metal in the concrete walls and therefore the 2,4 GHz signal from the second floor proivded by the Time Capsule is hardly available on the first floor. Since all our iDevices (iPhones and iPods) operate at the 2,4 GHz band we sometimes don't have a proper wi-fi connection. I had tried before with another (older) Airport Express that only operated at the 2,4 Ghz band, but I could get a proper connection between the Time Capsule and the Airport Express. Therefore I think it would be the best solution if the new Airport Express would provide both bands simultaneously.
If I replace my existing Airport Express with the new one, will I be able to extend my network on both bands?

It sounds like you may have configured your Time Capsule to use a separate name for the 5 GHz network and then setup the Express to extend that specific band.
In order to extend both bands, the Time Capsule setup will need to be changed so that both bands are using the same name. In other words, you would uncheck the option for the 5 Ghz name.
Then, setup the new Express to extend the Time Capsule network.
This is the only way that they Express can extend both bands. It cannot extend both bands if you have assigned a separate name to the 5 GHz network since you will be forced to choose either the 5 GHz band or the 2.4 GHz band for the Express to extend.
How the microwave oven will affect this is not known. This will one of those things that you have to try in your home to know if it will work well, so it might be a good idea to understand the store's return policy before you buy....in case things do not work out as hoped.

Configuring the HP PSC 2510 on a new network

I'm posting at the end of a long weekend setting up my psc 2510 on a new wireless network. I'm pretty much done, and I'm posting to share what I've learned with others in the hope of saving them trouble. I'm beyond my warranty period, so my advice is based on a few hints from phone tech support and a lot of work by trial and error.
I have four machines total, two of them running OS X 10.4, the others running 10.3.9.
1. Start by hooking the printer up to a wired (ethernet) network. Print out a network config page (setup, 6, 1) when the printer shows its blue "networked" light. Dial the printer's URL into your web browser and enter the new network's info into the printer's embedded web server. If you get everything right, when you turn off the printer, disconnect the ethernet cable, and turn on the printer, you'll get that blue "networked" light after a minute or so.
If you don't see the light, print out another config page and check the "Wireless Status": "Scanning" means that the printer's having trouble connecting to the network. Your best bet is to temporarily turn off all wireless encryption/security and reconfigure the printer's connection. Once you have a connection, then try adding various sorts of security/encryption. In my experience, the printer doesn't do well if the SSID of the network isn't being broadcast or with a list of acceptable MAC addresses. In my old network I managed to get the printer running with WPA security, but this time I had to settle for WEP 128 bit security.
The Wireless Status will read "Disabled" if the printer has a USB cable or Ethernet cable attached. This means you need to unplug all cables (and possibly turn the printer off and on) to enable the wireless card. If the Wireless Status is "Disabled" even though you have no cables attached, you have probably reset the printer to factory defaults (see #2 below).
Things to watch for: is the default gateway of the printer the same as that of your new network? I had to change my new network's gateway to "192.168.1.1 addressing" from "10.0.1.1 addressing" because the printer was expecting "192 etc." after being hooked up to a Linksys router for several years.
Also, you may find you need to give the printer a self-assigned (manual) IP address, if other computers, once linked to the printer, lose printing and/or scanning capabilities a few days or weeks later. This can be set in the printer's web access server, but make sure to assign the printer an IP address that's compatible with the range of IPs that your router's is leasing to the network. I'm a novice at this network stuff, so sorry if I'm being vauge on this point.
2. It's possible I could have saved myself a lot of trouble setting up the printer for the network if I had reset the printer's network settings to factory defaults right at the start. But if you decide to follow HP's instructions and reset network settings to factory defaults, BEWARE: the printer's embedded web server can't for some reason configure the printer to re-enable wireless networking. And the latest download of the hp all-in-one installer doesn't contain the network config utility found on the original HP installation CD. (On this old CD, the config utility isn't part of the install package, but it is invoked automatically during the installation process.)
SOLUTION: Run the PSC 2500 Series installer found on the HP CD, preferably from a Mac running an system older than Tiger. It might also be possible to avoid running the installer and just run the config utility.
From this point on, I'll assume you've managed to get the printer on your network. Here's how to get all your computers configured to use the psc's printer and scanner functions.
HP tech support advised me to download the latest installer/print driver and use that to install and configure the psc 2150. This is good advice, insofar as the old HP Director software has a memory leak and the old HP Scan was prone to crashing whenever the 2510 went into Energy Saving mode. But if your mac isn't running OX X 10.4 (Tiger), you'll find that your system doesn't seem to recognize the new print drivers installed with by the download. This is especially a problem if you follow HP tech support's advice and delete a bunch of files prior to upgrading from the old installer to the new one, as (I suspect) it was at this point that I deleted working printer drivers from my Macs running Mac OS 10.3.9.
So if you're running 10.3.9 or earlier, I advise you not to delete any files and to configure your computer for the print and scanner functions in the opposite order that HP advises.
Most important: through trial and error I discovered that the HP Setup application isn't able to configure the printer if more than one user is logged in (Fast User Switching!). (This is a particularly tricky error to diagnose as the only symptom is that the setup app keeps claiming that it "can't find device" even though in the stage just prior it had successfully detected it!) Log out all other users, then proceed with the following steps:
1. Go to Print Center (called Print Setup Utility in Tiger), delete your old psc printer (if any) and click "add printer". The psc should show up in HP IP printing or under Rendezvous (called Bonjour in Tiger), and when you click on it, the Add Printer utilty should automatically find the "HP All-in-one" printer driver. If something's gone wrong, though, you may get the message "Print Driver not installed". That's what happened to me after I deleted files (see above).
SOLUTION: Run the PSC 2500 Series installer found on your original HP CD. When it finishes, it will start the HP setup assistant, in the course of which you'll be directed to go to the Print Center and add your printer. Do so.
2. Once you've added the printer successfully, run the latest HP installer, a download from the HP website. You should be able to skip the step where it asks you to add the printer, as you did this in step one.
3. Finally, since you didn't delete any files earlier, be sure to remove HP Director from your dock and from your Startup items (Login items in Tiger) by opening Mac System Prefs - Accounts - Startup/Login Items. HP Director has a memory leak. And it is superceded by the newer HP Device Manager when you download and run the latest HP installer. You should find the new HP Device Manager in your dock after step 2 (above).
If you have questions, write me at the following email (account name reversed to foil spam bots):
[email protected]
Powerbook 17" Mac OS X (10.4.3) Airport Express base station

Hello dgt228, welcome.
I am not sure why you are choosing EAP. If you have set your router to use WPA, you should just set your printer to enable WPA. Is your wireless light illuminated on the front of your printer? Run a Wireless Network Test from the front of the printer to self-test the radio. If you can connect this printer with Ethernet to your router its connection will be more secure and more reliable.

You may need to configure the connection settings in the deployment descrip

Hi All
I am new to BPEL and going through Order Booking Tutorial (using 10.1.3.4 version of opmn ) .
I have a problem in 'Designing the Database Adapter to Insert Data' Chapter.
I have installed Oracle 10g Express Edition and BPEL Process Manager on my local system.
In the Example it has been asked to create a daabase connection with Third Party JDBC Driver. Instead I have created a database connection with Oracle(JDBC) Driver.So i didnt have to register any third party driver.
I cud access the Order/OrderItems table as well .
I Deployed the same on the server.But while running the process I get following error--
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
nested exception is:
     ORABPEL-11622
Could not create/access the TopLink Session.
This session is used to connect to the datastore. [Caused by: Listener refused the connection with the following error:
ORA-12519, TNS:no appropriate service handler found
The Connection descriptor used by the client was:
localhost:1521:XE
See root exception for the specific exception. You may need to configure the connection settings in the deployment descriptor (i.e. $J2EE_HOME/application-deployments/default/DbAdapter/oc4j-ra.xml) and restart the server. Caused by Exception [TOPLINK-4002] (Oracle TopLink - 10g Release 3 (10.1.3.4.0) (Build 080602)): oracle.toplink.exceptions.DatabaseException
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
I have checked several post on this error but every post talks about third party database.I have used Oracle Database only so why/What shud I change anything in oc4j-ra.xml?? This is my doubt .
Pls help me on this .Also Let me knowe in my case is there any need to create the datasource.?I am low at concept of database.
Pls help
Regards
Naveen

Hi
I am trying to insert orader and order Items as given in the Order booking tutorial..
Here are the files description
.wsdl file looks like
<service name="DBInsert">
<port name="DBInsert_pt" binding="tns:DBInsert_binding">
<jca:address location="eis/DB/MyConnection"
UIConnectionName="MyConnection"
ManagedConnectionFactory="oracle.tip.adapter.db.DBManagedConnectionFactory"
mcf.DriverClassName="oracle.jdbc.OracleDriver"
mcf.PlatformClassName="oracle.toplink.platform.database.oracle.OraclePlatform"
mcf.ConnectionString="jdbc:oracle:thin:@localhost:1521:XE"
mcf.UserName="system"
mcf.Password="6672B62098892995C8B651EFDF798A59"
/>
</port>
</service>
data source file looks like
<connection-pool name="MyConnection">

<connection-factory factory-class="oracle.jdbc.OracleDriver" user="orabpel" password="->pwForOrabpel" url="jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS_LIST=(LOAD_BALANCE=on)(ADDRESS=(PROTOCOL=tcp)(HOST=nakhanna)(PORT=1521)))(CONNECT_DATA=(SERVICE_NAME=XE)))"/>
</connection-pool>
<managed-data-source name="MyConnection" connection-pool-name="MyConnection" jndi-name="jdbc/MyConnectionDS"/>
</data-sources>
oc4j-ra.xml looks like
<connector-factory location="eis/DB/MyConnection" connector-name="Database Adapter">
          <config-property name="xADataSourceName" value="jdbc/MyConnectionDS"/>
          <config-property name="dataSourceName" value=""/>
          <config-property name="platformClassName" value="oracle.toplink.platform.database.Oracle9Platform"/>
          <config-property name="usesNativeSequencing" value="true"/>
          <config-property name="sequencePreallocationSize" value="50"/>
          <config-property name="defaultNChar" value="false"/>
          <config-property name="usesBatchWriting" value="true"/>
          <connection-pooling use="none">
          </connection-pooling>
          <security-config use="none">
          </security-config>
     </connector-factory>
##################################################################3
Still I get the same error .
<bindingFault xmlns="http://schemas.oracle.com/bpel/extension"><part name="code"><code>null</code>
</part><part name="summary"><summary>file:/C:/product/10.1.3.1/OracleAS_1/bpel/domains/default/tmp/.bpel_FulfillOrder_4.0_e77c64251e45eb4711a3a093f92e6a86.tmp/DBInsert.wsdl [ DBInsert_ptt::merge(OrdersCollection) ] - WSIF JCA Execute of operation 'merge' failed due to: java.util.MissingResourceException
java.util.MissingResourceException
; nested exception is:
     ORABPEL-00001
java.util.MissingResourceException
java.util.MissingResourceException
java.util.MissingResourceException
</summary>
</part><part name="detail"><detail>null</detail>
</part></bindingFault>
Pls let me know if something looks wrong in the above files
Thanks
naveen

Trying to connect my wired PC to the wireless airport express via the wireless router.

Trying to connect my wired PC to the wireless airport express via the wireless router. TP-link wired/wireless router. Ultimate goal is to send music from iTunes on PC to wireless router, then to airport, then to reciever. The amber light is blinking. Thanks in advance for the help!

If I'm understanding right your need and your computer has wired access to your network/router, all you have to do is give your AX wireless or wired access to your network too.
Wired should be easier. Just use a network cable to connect to the router. Power up the AX and look for it on AirPort Utility, do so without changing any of your computer settings. If it's visible, then on iTunes your AX should be visible on the AirPlay icon at the bottom-right corner.
If you want to connect your AX to your router wirelessly I would suggest to reset your AX settings by pressing and holding for a few secs the reset button next to all the ports. Once it is reset, using your computer try to look for the wireless network it'll be creating, it should be something like Apple Network 4341eb. Join that network and, using the AirPort Utility, configure your AX as a network client. Go to Wireless > Wireless Mode: Join a wireless network.
Select your router wireless network from the drop-down menu, select the appropriate security and type in your password. Click update.
It'll restart and automatically join your network. Have your computer join back your router network and, again, in iTunes bottom right you should be able to see the AX speakers.
Let me know if this worked.
Jorge...

Changing the name of the PC, I cannot configure the listener

Hello,
I use
Windows 7 64 bit
Apex 4.1
Glass Fish server
Oracle Database 11g Express Edition Release 11.2.0.2.0 - Production
PL/SQL Release 11.2.0.2.0 - Production
CORE 11.2.0.2.0 Production
TNS for 32-bit Windows: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production
I have changed the name of my PC ( for it contained "-" and "_") Then I did the following changes:
I changed the name of my PC in tnsnames.ora and listener.ora and "Hosts" file (in windows\system32\drivers\etc).
When I try to configure the listener, I get webpage saying Internal Error.
How can I reconfigure it again ????
Regards,
Fateh

Hello Fateh,
I think there are two options on how to reconfigure. In both cases, you'll have to locate your apex-config.xml .
h3. Option 1: Edit the apex-config.xml
h4. Steps
<ol>
<li>stop APEX Listener
<li>edit apex-config.xml (change hostname for the database connection)
<li>start APEX Listener
</ol>
h3. Option 2: Delete the apex-config.xml
h4. Steps
<ol>
<li>stop APEX Listener
<li>delete apex-config.xml
<li>start APEX Listener
<li>re-run the configuration process by calling http://<yourAPEXListenerHost>:<port>/apex/listenerConfigure
</ol>
-Udo

Re-configure the WRT54G2 to work with the EnGenius 5611P repeater?

I looked around the messages, but could not find anything on this topic.
I need assistance with the CISCO WRT54G2 V1. I have an EnGenius EOC5611P (500mW) Repeater set up in my RV and it connects directly to the PC inside my RV using, a CAT 5 connection. I am now using a laptop and would like to connect to the EOC5611P using wireless. So, that brings me to my question, "Can I re-configure the WRT54G2 to connect the 5611?" (I would plug the router directly into the 5611). According to EnGenius support, it is possible, but the router would have to be re-configured, but they do not support this setup. I would purchase an EnGenius EAO 7530 which would work perfectly, but the price is $245. Here is the link to the 5611 information http://www.engeniustech.com/index.php?option=com_content&view=article&catid=89utdoor-access-points-c...
Any thoughts?
Thanks in advance for any assistance you can offer.
Don

As far as the initial setup is concern you need to do the setup:
The router’s power adapter needs to be plugged to your router and into an available power outlet.
If using a wired connection, the first Ethernet cable needs to be plugged to the computer’s LAN port into any of the router’s blue numbered Ethernet ports.
The second Ethernet cable should be plugged to the modem’s Internet port and the other end into the router’s yellow Internet port.
Ensure that you have no firewall enabled that may prevent the router from being detected.
You can configure all the settings on your Router Manually as well.
If your Internet Service Provider is Cable follow this link: http://www6.nohold.net/Cisco2/ukp.aspx?pid=80&login=1&app=search&vw=1&articleid=4572
If your Internet Service Provider is DSL follow this link: http://www6.nohold.net/Cisco2/ukp.aspx?pid=80&login=1&app=search&vw=1&articleid=3687

How do I specify if the PID object is direct or reverse acting?

I have a process that requires a reverse acting controller - eg if the PV is above the setpoint, I need to increase the controller output to lower the PV. Where in the PID object configuration do I specify this?

Pat,
I think - you can achieve a "reverse acting" PID controller by setting the Gain value negative. However, if you manipulate the PID parameters you should know what effect it will have on your system. If you want to be sure you should simulate the parameter before you apply them to the "real" world. In addition you could verify the -Gain setting with the formula (position/velocity control equations) given in the Lookout online help of the PID control object.
Hope this helps
Roland
PS: I always keep in mind what my control profssor told us once - "just a minus sign (sign change) in contol theory could mean a lot"

How do you configure the ADC on RIO7833R for differential inputs?

I use the 7833 RIO board; my signal source is a differential signal.
According to the documentation I can configure the inputs to be differential using software, but I have not been able to find any instructions on how to do this. Can anyone point me to a way to achieve this?
There is the obvious "braindead" method of putting the positive signal into AI0+, and the negative signal into AI1+, then subtracting - but that would only allow me to use 4 inputs, not all 8. And it would probably increase the noise due to ADC nonlinearity. The diagrams show a MUX, I just can't seem to find a way to configure it and the default mode appears to be single-ended.
Thanks a lot for any information!
Floris HJ.

That's great help, thanks Prashanth. It answers the question which I asked, not the one I wanted answered. So now the 64 thousand dollar question (from the days when that was still a lot of money):
Can you do the same thing from software? In other words, could I set up my VI so it can change input mode in response to a user input or other external condition, and that doesn't require a user navigating to the project explorer? It would appear that there is some direct access of flash memory going on. If we know the address, could we poke that register directly (perhaps from the FPGA code itself - obviously we'd then have to signal from the host VI to the FPGA code but I know how to do that).
Thanks in advance for any help.
Floris

Configuring the PID (FPGA) Express VI

Similar Messages

Maybe you are looking for