Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 374)

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372 DMS 3.2 EN 02/2011 TD29

The properties for transmission on the CAN bus can be set directly after the insertion
of the module or can be called up with the command ’Extras’ ‘Properties’.
Using the selection option, set the required Baud rate which the transmission should
take place at.
One differentiates between synchronous and asynchronous transmission modes (see
PDO properties) for PDO’s (Process Data Object). The synchronisation message is sent
with a unique number Sync.COB-Id (Communication Object Identifier) in the interval
in microseconds which is given by the Communication Cycle Period. The synchronous
PDO’s are transmitted directly after the synchronisation message in the time window
(Sync.Window Length in microseconds). No synchronisation message will be sent if
the fields Comm. Cycle Period and Sync. Window Length contain 0.
activate: Only if this option is activated synchronization messages will be transmitted
between master and slaves.
The Communication Cycle Period can only amount to a multiple of the cycle time
assigned to the task. The task is assigned on the Module parameters of the CAN
master tab of the CAN master in the Update task field.
NodeID: serves to identify the CAN module uniquely and corresponds to the set
number on the module itself which is between 1 and 127. The Id must be entered as a
decimal number. ( Do not mix up with the 'Node number' !)
The CAN bus will automatically initialised and started when downloading is occurring
and when the controller system starts up if the option Automatic start is activated.
The CAN bus must be started up in the project if this option is not active.