CANopen configuration

[CarlDebrouwere]

Hello, I am quite new in the world of coding. For my work I have to make a CANopen network for controlling 4 linear actuators, which are connected in a serial way. I managed to make a CANopen network via: network = canopen.Network()

But I am kinda stuck here, I don't really know how to address to these nodes. Could somebody help me with this?

[af-silva]

Hi,

Can BUS is normally composed by two wires CAN Hi and CAN Lo (image below)

Courtesy of Sparkfun

So yes, if you have them connected this way you are correct, they all share the same bus of communication. Now, the next step is to know the protocol supported by the controllers of the actuators, if it is CAN DS402 you can use the BaseNode402 base class provided by the project, you can find it in the profiles folder. If not, if the manufacturer uses another implementation of the CAN protocol you can extend the RemoteNode and add the necessary functionality.

Since you say you are new at programing this tasks can be somehow daunting, so use this check list to move forward:

• First and foremost get an introduction to the CAN Bus network, you can read this wiki page;
• Which CAN protocol is supported by the drivers? (e.g., DS 402);
• The manufacturer provides the EDS files ? If so download them;
• Look at the exemple provided in the README.rst and try to understand what is happening, the code is well documented but you need to know some bases of how CAN networks work to understand it;
• If your drives support the DS 402 profile you can look at the BaseNode402 and look at the code, it implements the state machine used by this profile to monitor the connection and state of each connected controller;

Try going forward from here and if you have a more concrete doubt I will try to help.

best regards

[CarlDebrouwere]

Citeren André Filipe Silva notifications@github.com:

Hi,

Can BUS is normally composed by two wires CAN Hi and CAN Lo (image below)

Courtesy of Sparkfun

So yes, if you have them connected this way you are correct, they
all share the same bus of communication. Now, the next step is to know the protocol supported by the
controllers of the actuators, if it is CAN DS402 you can use the
BaseNode402 base class provided by the project, you can find it in
the profiles folder. If not, if the manufacturer uses another
implementation of the CAN protocol you can extend the RemoteNode
and add the necessary functionality.

Since you say you are new at programing this tasks can be somehow
daunting, so use this check list to move forward:

• First and foremost get an introduction to the CAN Bus network, you
  can read this wiki page;
• Which CAN protocol is supported by the drivers? (e.g., DS 402);
• The manufacturer provides the EDS files ? If so download them;
• Look at the exemple provided in the README.rst and try to
  understand what is happening, the code is well documented but you
  need to know some bases of how CAN networks work to understand it;
• If your drives support the DS 402 profile you can look at the
  BaseNode402 and look at the code, it implements the state machine
  used by this profile to monitor the connection and state of each
  connected controller;

Try going forward from here and if you have a more concrete doubt I
will try to help.

best regards

-- You are receiving this because you authored the thread. Reply to this email directly or view it on GitHub: https://github.com/christiansandberg/canopen/issues/164#issuecomment-542107781

Dear,

I managed to get the EDS files, I wasn't able to find out which CAN
protocil is supported by the controllers.

Regards, Carl

[CarlDebrouwere]

It is indeed DSP 402. But where can I find this porfiles folder?

Regards, Carl

[af-silva]

Hi Carl,

The profiles folder is at <project root>/canopen/profiles

If you want to get an idea of how to implement a simple node based on the DS402 profile please refer to this question #152