SSB - SDO communication

CANopen SDO communication (Service Data Object) is used to read or write any parameters in the CANopen bus node's object directory. The SSB uses the SDO communication for configuring the communication parameters during start-up.

Downloading Application-Specific Parameters when Starting Up

The appropriate parameters are to be entered here in the System Manager for the corresponding node in tab "SDO". The objects that result from the configuration under CAN node appear in square brackets. Any desired number of object directory entries can then be inserted.

The SSB expects a positive acknowledgement of the parameter download from the respective bus device. If it was not possible to write a parameter (the bus device has aborted the SDO) the card then attempts to read the corresponding value back and to compare it with the value that was to be written. This is because it could, for instance, be a read-only value, and therefore already correctly configured within the bus device. If they agree with one another, the card moves onto the next parameter entry.