Lenze DDS Function library IOSystem Manuel d'utilisateur télécharger pdf (Page 15)

Function library LenzeIOSystem.lib

Application examples

3.2 Compact decentralised I/O system

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LenzeIOSystem.lib EN 1.7

3.2 Compact decentralised I/O system

The compact module EPM − T832 with 24 digital inputs and 8 digital 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_IOParCompactModule for parameterising the communication conditions 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_IOCompactModule 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 once only at the beginning.

Then the Parameter program that must be generated in the SFC editor follows. With the invocation

of the function block instance, the step ParCompact has the action generated in the FBD editor.

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Lenze DDS Function library IOSystem Manuel d'utilisateur Page 15