ifm
System Manual
ecomat
mobile
PDM360NG (CR1080, CR1081, CR9042) Target V01
2011-07-28
CAN in the PDM360
CAN POUs to CANopen
270
CANopen network variables
General information................................................................................................................... 270
Configuration of CANopen network variables ........................................................................... 271
Particularities for network variables .......................................................................................... 275
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General information
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Network variables
Network variables are one option to exchange data between two or several controllers. For users the
mechanism should be easy to use. At present network variables are implemented on the basis of CAN
and UDP. The variable values are automatically exchanged on the basis of broadcast messages. In
UDP they are implemented as broadcast messages, in CAN as PDOs. These services are not
confirmed by the protocol, i.e. it is not checked whether the receiver receives the message. Exchange
of network variables corresponds to a "1 to n connection" (1 transmitter to n receivers).
Object directory
The object directory is another option to exchange variables. This is a 1 to 1 connection using a
confirmed protocol. The user can check whether the message arrived at the receiver. The exchange is
not carried out automatically but via the call of FBs from the application program.
chapter
The object directory of the CANopen master
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