CAN-8123/CAN-8223/CAN-8423 user’s manual (Revision 3.00, May/22/2009) ------
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Cyclic synchronous
Inversely, the cyclic synchronous transmission mode is triggered by the
reception of an expected number of SYNC objects, and the max number of
expected SYNC objects can be 240. For example, if the TxPDO is set to
response when receiving 3 SYNC objects, the CAN-8123/CAN-8223/
CAN-8423 will feed back the TxPDO object according to the set. For the
RxPDO, actuating the DO/AO channels by the RxPDO is independent of the
number of SYNC objects. These concepts are shown in the figures below.