Operating instructions

22 08/06
4.9.2 Process SYNC telegram
If synchronous PDO’s have been created in an frequency inverter, their processin
g
is
synchronized with the SYNC telegram. The SYNC telegram is generated by the system
bus master and is a telegram without data.
The identifier is 128 according to the Predefined Connection Set.
If a PC or PLC is used as a master, the identifier of the SYNC tele
g
rams can be adapted
by parameterization on the frequency inverter. The identifier of the SYNC tele
g
ram
must be set identically in all subscribers on the system bus.
Attention! The identifier range 129 ... 191 may not be used as the emergency tele-
grams can be found there.
The setting of the identifier of the SYNC telegram is done via the parameter
SYNC-
Identifier
918.
Parameter Setting
No. Description Min. Max. Factory setting
918 SYNC-Identifier 0 2047 0
T
he settin
g
"0” results in identifier assi
g
nment accordin
g
to the Predefined Connection
Set.
The data of the Rx-PDO’s are forwarded to the application after the arrival of the SYNC
telegram. At the same time, the Tx-PDO’s with the currently available data from the
application are sent.
SYNC
SYNC
RxPDO's RxPDO'sTxPDO's TxPDO's
Zeit
This method enables pre-occupancy of set points in the system bus subscribers and a
synchronous / parallel take-over of the data.