CANopen
Profiles for J1939 networks
The CAN in Automation Association (CiA) has published the CiA 406-J and CiA 410-J specifications, which specify the mapping of CANopen profiles for rotary encoders and inclinometers for J1939 networks.
Both application layers, CANopen and J1939, are used in mobile machinery. Many manufacturers have implemented the CANopen profiles. To ensure that these products can also be used in J1939 networks, CiA has applied for and received corresponding parameter group numbers (PGNs) from SAE International. In order to be able to configure the sensors as in CANopen, the CiA 510 specification was also developed. It describes the mapping of the CANopen SDO protocols to J1939. The parameter groups CAM11 and CAM21 are used for this purpose. A mapping of the CANopen EMCY message is also specified.
"With these CiA specifications, it is very easy to use CANopen profiles in J1939 networks," explained Holger Zeltwanger, CiA Managing Director. "In the past, this was done on a company-specific basis, which made it difficult to exchange products from different manufacturers." CiA 510 standardizes the configuration of devices that support a CANopen profile. "The J1939 sensors implement a virtual CANopen object dictionary that can be accessed via CAM11 and CAM21," says Zeltwanger.
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