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0198441113586, V2.01, 11.2008
IL•1F CANopen DS301 3 Basics
Fieldbus interface 25
Client-server relationship A client-server relationship is established between 2 devices. The
"server" is the device whose object dictionary is used during data ex-
change. The "client" addresses and starts the exchange of messages
and waits for a confirmation from the server.
A client-server relationship with SDOs is used to send configuration data
and long messages.
Figure 3.8 Client-server relationship
The client addresses and sends a CAN message to a server. The server
evaluates the message and sends the response data as an acknowl-
edgement.
Producer-consumer relationship The producer-consumer relationship is used for exchanging messages
with process data, because this relationship enables fast data exchange
without administration data.
A "Producer" sends data, a "Consumer" receives data.
Figure 3.9 Producer-consumer relationships
The producer sends a message that can be received by one or more
network devices. The producer does not receive an acknowledgement
to the effect that the message was received. The message transmission
can be triggered
• by an internal event, e.g. "target position reached"
• by the synchronization object SYNC
• a request of a consumer
For details on the function of the producer-consumer relationship and on
requesting messages see chapter 3.4 "Process data communication".
Client
Server
data
data
request
data
data
Consumer
Consumer
Consumer
Consumer
Consumer
Producer
Producer