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14 08/06

4.6 Functional overview

The system bus produces the physical connection between the frequency inverters.

Logical communication channels are produced via this physical medium. These chan-

nels are defined via the identifiers. As CAN does not possess a subscriber-oriented, bu

a message-oriented addressing via the identifiers, the logical channels can be dis-

played via it.

In the basic state (factory settin

) the identifiers are set accordin

to the Predefined

Connection Set of CANopen. These settin

s are aimed at one master servin

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

of the

identifiers in the subscribers has to be adapted.

Note: The exchange of data is done message-oriented. An frequency inverte

can transmit and receive a number of messa

es, identified via various

identifiers.

As a special feature, the properties of the CAN bus mean that the messages transmit-

ted by one subscriber can be received by a number of subscribers simultaneously. The

error monitorin

methods of the CAN bus result in the messa

e bein

ected by all

recipients and automatically transmitted again if there is a faulty reception in one re-

ceiver.

4.7 Network management

The network mana

ement controls the start of all the subscribers on the system bus.

Subscribers can be started or stopped individually or together. For subscriber recogni-

tion in a CAL or CANopen system, the slaves on the system bus generate a startin

telegram (boot-up report).

In the event of a fault. the slaves automatically transmit a fault report (emer

ency

message).

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

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