Holger Zeltwanger

Articles

Wireless June 10, 2016

Process data object re-mapping procedures

Process data object (PDO) mapping is an essential feature of CANopen that describes which individual process variables in the data field of a PDO is transmitted. CiA 301, in particular, requires a dedicated re-mapping procedure.

By Holger Zeltwanger
Mobility May 21, 2016

Optional parameters for CANopen provide additional support

CANopen features mandatory, conditional, and optional parameters. However, the device still has to behave as specified even if the optional parameters aren’t implemented to ensure interoperability.

By Holger Zeltwanger
Cybersecurity April 9, 2015

CANopen provides distributed control functionality

There are some misunderstandings regarding the multi-master functionality of CANopen-based control systems. The under-laying CAN data link layer is a multi-master protocol, and each CAN node has the right to request bus access at any time. Depending on the priority of the CAN data frame, the node gets immediate bus access or it has to wait.

By Holger Zeltwanger
Wireless March 13, 2015

Conformance and interoperability testing

Compatibility is just a marketing term. Testing of conformity is nice to have, but customers are more interested in interoperability. With CAN controllers, different test plan implementations can lead to different results. CiA and other consortia organize so-called plug-fests, where prototypes and just released devices are tested on interoperability.

By Holger Zeltwanger
Industrial Networking February 16, 2015

A short history of standardization and CAN

Standards might be boring to read about, but we couldn’t do without them. Without standards modern civilization would be much more difficult, costly, and hazardous, because we didn’t standardize the fire hydrants.

By Holger Zeltwanger
Process Safety March 31, 2014

Motion control and drives profile expanded

The CiA 402 motion control and drives profile originally developed for CANopen systems will be extended for functional safety. In addition, A new PDO mapping was introduced, to control asynchronous as well as synchronous motor with the very same device.

By Holger Zeltwanger