Siemens NAN 67 Series Wartungshandbuch PDF herunterladen (Seite 60)

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101

4-8

Ladder Logic (LAD) for S7-300 and S7-400

C79000-G7076-C504-02

4.5 Creating User-Defined Data Types (UDTs)

User-defined data types are data structures that you create yourself and save

as blocks. Once defined, you can use them under their absolute or symbolic

block names, throughout the entire user program. You can use UDTs as

follows:

S Like elementary or complex data types as the data type in the declaration

of logic blocks (FCs, FBs, OBs) or in data blocks (DBs).

S As templates for creating data blocks with the same data structure.

Figure 4-5 shows the basic procedure for creating a user data type:

Create a block for a UDT in the

SIMATIC Manager or in the Editor

Edit the block properties

Save the block

Edit the declaration table

LAD Editor

Figure 4-5 Creating a User Data Type

After creating or opening a UDT in the SIMATIC Manager or the

incremental editor, a declaration table is displayed in which you declare the

structure of the data type.

Overview

Procedure

Editing a

Declaration Table

Creating Data Blocks and User-Defined Data Types

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