Festo SFC-LAC CO Series, Manual, Page: 30 / 328

1. System summary
1−10
Festo P.BE−SFC−LAC−CO−EN en 0708NH
1.2 Communication
1.2.1 Data exchange in CANopen
CANopen devices have an object directory which makes all
important slave parameters accessible in a standardized
manner. A CANopen system is essentially configured by
accessing the objects in the object directory of the individual
stations. The data exchange in CANopen is in the form of
telegrams with which the work data is transmitted.
A distinction is made between Service Data Objects (SDO),
which are used for transmitting service data from and to the
object directory, and between Process Data Objects (PDO),
which serve for the fast transfer of current process states. In
addition, telegrams are defined for the network management
and the fault messages.