Lenze DDS v2.3 Manual de usuario descargar pdf (Pagina 16)

100

101

Drive PLC Developer Studio

Introduction

2-4

DDS EN 2.3

2.2.4 Function block

A function block is a software organization unit whose execution returns one or several values.

• Unlike a function, a function block does not supply a return value.

• A function block declaration starts with the keyword FUNCTION_BLOCK.

• The creation of instances (data records) of a function block is a prerequisite.

2.2.4.1 Function block instances

• Every instance has its own identifier (instance name) and a data structure which includes its

inputs, outputs and internal variables.

• Instances are locally or globally declared like variables by giving the function block name as

identifier type.

Example of an instance named INSTANZ of function block FUB:

INSTANZ: FUB;

• The instances described above are always used to call function blocks.

• Only input and output parameters can be accessed from outside an instance of a function

block, not its internal variables.

Example with the help of a data model:

Instances L_ABS1 ... L_ABSn are instances of the function block type L_ABS. Instance as many

instances as required.

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Lenze DDS v2.3 Manual de usuario Pagina 16

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