Lenze DDS Function library IOSystem Manual do Utilizador descarregar pdf (Página 11)

Function library LenzeIOSystem.lib

Application examples

3.1 Modular decentralised I/O system

3−1

LenzeIOSystem.lib EN 1.7

3 Application examples

The examples were generated with DDS version 2.0. Examples concerning the I/O system are given

in the directory C:\Programme\Lenze\DDS_P_2_20\Projects\IOSystem\Samples

3.1 Modular decentralised I/O system

The modular decentralised I/O system with eight digital inputs and outputs is integrated into a PLC

program with the help of LenzeIOSystem.lib.

During this process, the following steps must be carried out in the given order:

1. Initialise the CAN driver

2. Parameterise the communication conditions

3. Program the process data exchange between PLC and I/O system

4. Initialise the codes

Initialising the CAN driver

Communication between the PLC and the I/O system is based on "unassigned CAN objects"

(control, alarm, diagnostics...). These objects are available in DDS from version 2.x onwards.

To initialise the unassigned CAN objects, the function L_CANInit must be requested once only in the

system POU PLC_ColdStart.

Parameterising the communication conditions

Function block L_IOParPDO15 for parameterising the communication conditions of PDO1−PDO5 is

integrated into the SFC editor and necessarily is to be used in every project. This function block

specifies the communication parameters in the I/O system.

The values are transferred to the process data block L_IOData15 as a structure (STRUCT) in order

to match the communication parameters of the devices (controller and I/O system).

On program execution, this step is executed only once at the beginning.

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Lenze DDS Function library IOSystem Manual do Utilizador Página 11