CANOpen-Message with NI-USB-847x

Question

Hi,
i trying to build up a communication between LabVIEW and a Festo-Tool. The Festo-Tool accept only CANOpen-Message-Protokoll. I've got only the NI-USB-8472. I need to send only 2 commands: "go in Operational-Mode" and "open or close a valve". Not more. Some people say that's possible with my hardware. But how? Please give me a feedback and/or an example. Thanx!
Hallo,
ich versuche eine Kommunikation zwischen  LabVIEW und einer Festo-Ventil-Insel aufzubauen. Leider nutzt Festo das CANOpen-Protokoll und ich habe nur die NI-USB-8472 - Box. Ich muß nur zwei Befehle senden: "gehe in Operational Mode" und "öffne oder schliesse ein Ventil". Mehr nicht! Einige meinten das ginge auch mit dieser Hardware, aber wie? Kann mir jemand ein Beispiel geben? Danke!
Jens G.

Answer 1

Hello there,
I am new to CAN, and I am trying to implement another Festo
tool (an AC motor controller) which accepts CANopen protocol. I have a USB-8473 to communicate with the controller by using
Labview program. I downloaded two SDO (read only) and PDO (read and write) examples
available on the following link from the NI website.
http://zone.ni.com/devzone/cda/epd/p/id/5873
The problem is I can just use the SDO example to read some parameters
from the controller, and I do not know how I can implant the PDO example to
change controller’s parameter. This code use T-PDO (Index: 0x1800 and 0x1801)
to read and write data. But I do not know how I can first insert a data and
then transfer it to a specific object like “controlword” (Index: 0x6040 sub:0x00)
in order to enable the controller.
I hope you can help me.
TIA,
Roozbeh