11.6 SYNC
The SYNC message has two meanings.
The SYNC message is necessary for Rx/TxPDO with transmission type synchronous.
The SYNC message synchronizes the different devices to communicate with data from
the same (defined) time. As soon as the SYNC telegram is received, the data
devices are “frozen” and then exchanged during the following data telegrams.
The RxPDO telegrams are collected until a SYNC telegram is received. With the rece
tion of the SYNC telegram the data are transferred internally to the application p
rameters.
TxPDOs defined as synchronous send the actual application data on SYNC reception.
Additionally the SYNC mechanism can be used to synchronize the operating systems
(OS)
of different drives. This is useful when the electronic gear is used to enhance the
performance of the application. The synchronization of the operating systems is d
scribed in chapter 11.10.
The SYNC message is a message with no data or with
one byte data which is ignored.
The default Identifer = 0x80 (=128).
38 CM-CAN ACU 04/13
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