General Aspects Of Canopen - Festo CPV GE-CO2-8 Series Electronic Manual

2. Commissioning

2.2.1 General aspects of CANopen

Festo P.BE-CP-CO2-EN en 0107NH
CANopen devices have an object directory which gives access
to all important slave parameters in a standardized manner. A
CANopen system is configured mainly by access to the object
directory of the individual slaves. The access mechanism is
provided by Service Data Objects (SDOs).
Two different mechanisms are available for communication in
a CANopen system.
The Process Data Objects (PDOs) serve for the speedy
transfer of processing data and are transmitted by simple
CAN messages without protocol overhead. Process Data Ob-
jects can be transmitted event-controlled, synchronous with a
system time interval or on demand.
The Service Data Objects (SDO) form a point-to-point connec-
tion and permit access to each entry in the object directory of
a node.
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