Operating instructions

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4.9.2 Process SYNC telegram

If synchronous PDO’s have been created in a frequency inverter, their processing 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 telegrams can be adapted

by parameterization on the frequency inverter. The identifier of the SYNC telegram must

be set identically in all nodes 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

The setting "0” results in identifier assignment according 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 transmission of the Tx-PDO’s with the currently avail-

able data from the application is triggered.

SYNC

RxPDO's RxPDO'sTxPDO's TxPDO's

time

This method enables pre-occupancy of set points in the system bus nodes and a syn-

chronous / parallel take-over of the data.