Lenze PLC Designer PLC Designer (R2-x) CANopen for Runti User Manual download pdf (Page 44)

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CAN network variables

 DMS 2.0 EN 05/2009 TD29 43

4 CAN network variables

Network variables can be used to exchange data between one or multiple PLCs. The mechanism

should be easy to handle fort he user. Currently network variables are implemented for CAN and

UDP. The variables’ values are exchanged automatically on the basis of broadcast messages. In UDP

these are realized as broadcast telegrams, in CAN as PDOs. Concerning the used protocol these

services are not-confirmed services, i.e. there is no control whether the message reaches the

receiver. Network variables exchange is a 1 (sender) to n (receiver) - connection.

The Parameter-Manager is another possibility to exchange variables. This is a 1 to 1 – connection,

using a confirmed protocol. This means that the user can guard, whether the message has reached

the receiver. The exchange is not done automatically but via calling function blocks in the application

program.

4.1 CAN network variables for the user

To use the network variables with »PLC Designer« the user must perform the following steps:

4.1.1 Preconditions

A »PLC Designer« programming system Version 2.3 SP5 (or higher) must be installed and the

following libraries must be available:

3s_CanDrv.lib, 3S_CanOpenManager.lib and 3S_CanOpenNetVar.lib

»PLC Designer« automatically generates the required initialization code and the calls of the network

POUs at the start and the end of each cycle.

4.1.2 Target Settings

Activate option Support network variables in the dialog box 'Target Settings' (tab

'Networkfunctionality'). At Names of supported networkinterfaces enter the name of the desired

network, e.g. CAN. The required libraries will then automatically be included in the project with the

next compile.

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Lenze PLC Designer PLC Designer (R2-x) CANopen for Runti User Manual Page 44