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4.6 Functional overview
To start with, the system bus produces the physical connection between the frequency
inverters. Logical communication channels are produced via this physical medium.
These channels are defined via the identifiers. As CAN does not possess a node-
oriented, but a message-oriented addressin
g via the identifiers, the logical channels
can be displayed via it.
In the basic state (factory setting) the identifiers are set according to the Predefined
Connection Set of CANopen. These settings are aimed at one master serving all the
channels. In order to be able to build up process data movement via the PDO channels
between individual or a number of inverters (transverse movement), the settin
g of the
identifiers in the nodes has to be adapted.
Note: For understanding, it is important to observe that the data exchange is
done message-oriented. The frequency inverter can transmit and receive a
number of messages, identified via various identifiers.
As a special feature, the properties of the CAN bus mean that the messages transmit-
ted by one node can be received by a number of nodes simultaneously. The error
monitoring methods of the CAN bus result in the message being rejected by all recipi-
ents and automatically transmitted again if there is a faulty reception in one receiver.
4.7 Network management
The network management controls the start of all the nodes on the system bus. Nodes
can be started or stopped individually or together. For node recognition in a CAL or
CANopen system, the slaves on the system bus generate a starting telegram (boot-up
report).
If a fault occurs, the slaves automatically transmit a fault report (emergency mes-
sage).
For the functions of the network management, the methods and NMT telegrams (net-
work management telegrams) defined according to CANopen (CiA DS 301) are used.
PLC
Controller / PC
Field bus
System bus Master
Parameter Function
SDO 2 SDO 1 PDO
System bus
System bus Slave
Parameter Function
SDO 2 SDO 1 PDO
System bus
System bus