9300 Servo PLC
Connection
3-49
9300ServoPLC EN 1.4
3.4.6.1 Cyclical process-data objects
In order to be able to read process-data from the drive controller, or to accept the process-data by
the drive controller, a special additional telegram is required - the sync telegram.
The sync-telegram is the trigger point for the acceptance of data by the drive controller, and initiates
the transmision procedure at the controller. For a cyclical processing of process-data the
sync-telegram must be generated accordingly.
The synchronization of cyclical process-data
Process-data from
Controller
Process-data to
Controller
Sync-telegram Sync-telegram
Abb. 3-22 Sync-telegram
After a sync-telegram, the cyclical process-data are transmitted by the drive controllers. The data
transfer to the drive controllers follows next, that is again accepted by the individual controllers with
the next sync-telegram.
All other telegrams, such as parameters or the event-controlled process-data, are accepted
asynchronously by the drive controllers after the transmission has taken place.
The asynchronous data are not considered in Abb. 3-22.
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