Synchronization (SYNC)
Application Manual POWERLINK Controlled Node
Document no. 5.13013.04 Baumüller Nürnberg GmbH
36
of 80
5.4
5.4 Synchronization (SYNC)
The Start of Cycle (SoC) frame is used for synchronizing the CNs. This frame is uncon-
firmed (multicast) and is sent by the MN.
It does not contain any data. The POWERLINK
Controlled Node is able to receive SoC frames.
The receipt of a SoC frame generates an interrupt on the POWERLINK Co
ntrolled
Node; this interrupt is forwarded to the b maXX 4000 controller. Thus, this signal can be
used for the synchronization of the b maXX 4000 controller. Within a communication cy-
cle all corresponding frames have to be sent to all
configured slaves and in doing so the
number of nodes and the processing time have to be considered. The cycle time for the
SoC frame is set in object 0x1006. For this see ZDire
ctory of objects for communication
control– f
rom page 28. Furthermore, the communication cycle time has to be stored in
the data set of the controller.
The so-called multiplexing in PO
WERLINK allows not to request single nodes in each cy-
cle. Thus, several nodes can share one time section
in the transmission phase, so that
the bandwidth of the synchronous phase can be used in an optimum way on the
POWERLINK bus. The configuration of this assignment is effected by the Managed
Node.
5.4.1 Frame structure SoC
The structure of the Start of Cycle (SoC) frame is as follows:
Bit offset
Byte offset 7 6 5 4 3 2 1 0
0 Message Type = SoC (0x01)
1 Destination = Broadcast address (0xFF)
2 Source = Node ID of the MN (0xF0)
3 reserved
4 MC PS res res res res res res
5 reserved
6 ... 13 NetTime (optional)
14 ... 21 RelativeTime (optional)
22 ... 45 reserved
MC (Multiplexed Cycle Completed)
PS (Prescaled Slot)
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