Howto build CAN-devices with CANopen Library

Hi
We're two students working on a project to simulate CAN devices connected to a master. We have to "build" these devices in LabView. We've been working with the CANopen Library and the Channel API.
We would prefer to use the CANopen Library, because it is easier that way to build the device's behaviour as it would be in "real-life". But the problem is, that the CANopen Library has been developed to build a CAN Master. Is there a way to bypass that. So that we could build the other side... a CAN device.
We figured out, that we simply could alter the COB-IDs for de PDOs, that would do it. But the whole SDO and Sync part isn't that easy to bypass.
Would be glad if we could get a tipp
Thank you in advance
Ranil Wijeyratne

Hi,
I'm a little confused on the master/slave terminology you're using, however, as CAN (also Canopen) is really a peer bus. Any device on the CAN bus can transmit and receive messages as described below (from the NI-CAN User Manual):
"When a CAN device transmits data onto the network, an identifier that is unique throughout the network precedes the data. The identifier defines not only the content of the data, but also the priority. A CAN identifier, along with its associated data, is often referred to as a CAN Object. When a device transmits a message onto the CAN network, all other devices on the network receive that message
. Each receiving device
performs an acceptance test on the identifier to determine if the message is relevant to it. If the received identifier is not relevant to the device (such
as RPM received by an air conditioning controller), the device ignores the message.
When more than one CAN device transmits a message simultaneously, the identifier is used as a priority to determine which device gains access to the network. The lower the numerical value of the identifier, the higher its priority."
As you can see, you can use our CAN interface "slave" to receive commands from any other device on the CAN bus "master".
Also the Canopen Library is just the API for LabVIEW, both CAN and Canopen ends up in Bits which then will be send to the "Listeners"! They´re just on other Layers on the Programming. But both is really easy with LabVIEW
Hope this helps.
Alex Rudolph
NI Switzerland

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Supplying CAN devices with bus power

Hello everyone,
Is it possible to provide bus power to a CAN device with a PCI-CAN Series 2 card?
The manual is a little confusing in this matter. Table 4-1 in the manual states that V+ is "Optional CAN power supply if bus power or external VBAT is required." This makes me think that I can supply a CAN device with bus power from the card's internal source (as long as my jumper is configured for internal).
A few lines later the following statement is made: "V+ supplies bus power to the CAN physical layer if external power is required...it is not necessary to supply V+, unless you have configured the VBAT jumper for EXT." This makes me think that V+ has nothing to do with supplying power to devices, and only with powering the bus on the card itself.
If it is not possible to supply bus power with the NICAN card, what is the recommended method for powering a device on the same CAN network (assuming the device is not powered somewhere in its own circuitry)?
Thanks for any help,
Dave

Hi Dabramsom,
the part of the manual that I assume you are referencing is:
   "V+ supplies bus power to the CAN physical layer if external power is
   required. All High-Speed Series 2 PCI, PXI, and USB hardware is powered
   internally, so it is not necessary to supply V+, unless you have configured
   the VBAT jumper for EXT."
The PCI-CAN/2 cards can be powered either internally or externally.
To power the device externally the VBAT jumper should be configured for EXT,
now your card will be powered by an external source, your card cannot be
configured to be the source for another device. Please reference the following KnowledgeBase:
What Do the Power Jumper Settings on the NI-CAN Cards Mean?
As for powering your CAN device it really depends on your device; what are the power
specifications? Can you consider using a battery?
I hope this answers your questions.
Christian A
National Instruments
Applications Engineer

Accessing CAN-Device using CANopen

Hi all
Today I started with the initial startup of a CAN system, which should be used in a test rig.
First some information about the system:
- 3 external nodes connected to the bus (using CANopen protocol (at least I was told so), usually running autonomously)
- 1 CAN interface card (NI PCI-CAN Series 2)
- PC-System running under WinXP professional
I know the cabling works, as this was tested with another software.
The first thing I made a few weeks ago, was to download some source from the forums. Looking at this, I created a simple vi, which should get data using SDO (attached).
I also attached some pictures of this other software (screenshot software, screenshot can-trace). I just tried to do the same (read a value), with the above mentioned vi. There is also a screenshot from this vi, when I executed it. First it seemed ok, but then I got a warning (probe 1) out of CWrite.vi and right afterwards I got an error (probe 2) out of CWait.
At another try I came out of CAN init.vi with a warning, but then I got an error "unknown object" when trying to write the data.
Could you give me some advice on that? The values I tried to send are the default values of the vi.
Using LV8.0
Don't be afraid to rate a good answer...
Attachments:
CAN_Test.zip ‏769 KB

Hallo Dirk
Ich switche jetzt auf Deutsch, nachdem ich in deinem Beispiel-Code einen Kommentar auf Deutsch gesehen habe.
War heute wieder an diesem Prüfstand und habe dein Programm mal laufen gelassen und dabei folgendes Verhalten gehabt:
1. Kein Problem bis zur Funktion "ncWriteObj.vi" - dort wurde eine Warnung zurück geliefert.
2. In der Funktion "ncReadNetMult.vi" wurde dann ein Fehler (siehe Attachment) ausgelöst.
Leider macht diese Fehlermeldung irgendwie nicht so wirklich Sinn, da die Busteilnehmer mit Spannung versorgt sind. Die ganze Verkabelung wurde, wie vorher schon mal erwähnt, mit einem anderen Programm (ext. SW) und dem Notebook eines Kollegen getestet. Dieser Kommuniziert über eine Softing CANUsb-Schnittstelle mit den CAN-Devices - ohne Probleme und mit der selben Prüfstandeinstellung wie ich das Versuche. Der Bus ist in den Geräten 2x mit 120Ohm abgeschlossen - also müsste auch das passen.
Ebenfalls angehängt habe ich dein Programm, so wie ich es getestet habe.
Für weitere Tipps und Infos bin ich sehr dankbar. Ich werde in den nächsten Tagen auch mal versuchen über diese Softing Schnittstelle zu kommunizieren. Trotzdem ist mein Schlussziel immer noch die Verwendung der NI-Karte.
Danke für deine Bemühungen.
Thomas
Using LV8.0
Don't be afraid to rate a good answer...
Attachments:
Unbenannt.JPG ‏25 KB
CANopen-Sensor.llb ‏89 KB

Syncing Numerous Devices with iTunes Library on a Mac Mini

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Hi davidforner!
I have an article here that I believe can help you accomplish your goals. That article can be found here:
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http://support.apple.com/kb/ht4527
You can also use this article to learn more about switching from a PC to a Mac and getting your information onto the new computer:
Apple - Support - Mac Basics
http://www.apple.com/support/macbasics/
Take care, and thanks for visiting the Apple Support Communities.
-Braden

Greyed Out Tracks When Synching iOS device with iTunes Library

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My apple TV will work fine and then it stops and says having trouble communicating with your library. I have reset the device 3 times and after it works fine, but then I have to reset all settings again. It is getting really frustrating because the signal is fine and everything it just stops working for some reason. Can any one help or does anyone else experience this issue?

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Hi, How do I communicate CANopen device with anyother CAN device? What things needs to be made compatible with 2 CAN devices to communicate?

Hi,
I have to communicate CANopen device with other CAN device which uses GMLAN.
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Najmu

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Regards
Akshat Jain

I am trying to put the music from my ipod onto my new computer. After installing itunes and connecting my ipod touch a message comes up saying that my ipod is already synced with another library. What can I do to sync it with a new library?

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When you connect your iPod for the first time, all media content will be erased. But you can restore your settings and app data from your manual backup afterwards.
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Passing arrays with Call Library Function does not work after application builder

Calling a DLL with Call Library Function which requires an array of data works correctly in Labview, but after building an exe with application builder, the call no longer works. Dereferecing the pointer in the DLL retuns all 0s and not the actual values.
Solved!
Go to Solution.
Attachments:
TEST.zip ‏28 KB

I did not run your code because it is a little unclear to me what it does.
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HT1386 I keep getting a message while downloading purchased music into Ipod that reads " U can download past purchases on this device with just 1 apple ID every 90 days. can b used with another apple ID in 42 days" what does that mean? cant get music on

I have purchased an album and its on my computer in library, plays there and on Ipod as downloaded but cant get it in to music. also havent been able to get my music that I download into hard drive to sync either, afraid to restore [reset] because with have to re-download all of my cd s again. HELP

It means exactly what it says. For redownloading via iCloud (which is what you are doing).
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A lost my remote control for apple tv. I want to use my phone as a remote but the applications can' pair with the Apple TV device , how can I pair them without remote?

A lost my remote control for apple tv. I want to use my phone as a remote but the applications can' pair with the Apple TV device , how can I pair them without remote?

Setup for remote app: http://support.apple.com/kb/ht1947
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Can I backup two devices (with different documents) to one iCloud account? For example: iPad and iPhone, not everything is synced between the two, but I would like to backup each (seperately in the cloud), is this possible?

Hello Apple Community,
Can I backup two devices (with different documents) to one iCloud account?
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Terminology check here. Do you really mean a "CD"? There's a difference in Cloud behavior between content from a physical CD you ripped (which only has Cloud content if you have iTunes Match) and an "album" you bought from the iTunes Store.
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All of the music on my Ipod Touch is blown out after I synched it with my new MacBook. I didn't get the 'synch' warning-- but now can't find my library of songs. I'm about to panic!

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The iPod backup that iTunes makes does not inlcuded synced media like apps and music. Thes those iTunes are not restored to the iPod unless they are in the iTunes library.
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Howto build CAN-devices with CANopen Library

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