Lenze E84AVHC Series - 10.7.4 PDO synchronisation via sync telegram

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Firmware ≤ 05.00 - DMS 4.2 EN - 02/2010 L 527

8400 HighLine | Parameter setting & configuration

System bus "CAN on board"

Process data transfer

10.7.4 PDO synchronisation via sync telegram

During cyclic transmission, one or more PDOs are transmitted/received in fixed time

intervals. An additional specific telegram, the so-called sync telegram, is used for

synchronising cyclic process data.

 The sync telegram is the trigger point for the transmission of process data from the

slaves to the master and for the acceptance of process data from the master in the

slaves.

 For sync-controlled process data processing, the sync telegram must be generated

accordingly.

 The response to a sync telegram is determined by the selected transmission

type.Transmission type

( 525)

Basic workflow

[10-6] Sync telegram

A. After the sync telegram has been received, the slaves transmit the synchronous process

data to the master (TPDOs). The master reads them as process input data.

B. When the transmission process is completed, the slaves receive (RPDOs) the process

output data (of the master).

– All other telegrams (e.g. parameters or event-controlled process data) are accepted

acyclically by the slaves after the transmission is completed.

–Illustration [10-6]

does not include acyclic data. However, they need to be considered

when dimensioning the cycle time.

C. The data are accepted in the slave with the next sync telegram if the Rx mode is set to

1 ... 240. If the Rx mode is 254 or 255, the data are accepted in the next device cycle,

irrespective of the sync telegram.

Short overview: Parameters for the synchronisation via sync telegram

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