Siemens NAN 67 Series Manual de Serviço descarregar pdf (Página 32)

3-8

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

C79000-G7076-C504-02

3.4 Editing Variable Declaration Tables – Overview

After you have entered the required declaration type of a new declaration,

enter the name of the variables, the data type, the initial value (optional) and

the comment (optional). You can move the cursor to the next field with the

TAB key. At the end of a row an address will be assigned to the variable

automatically.

After each table field has been edited, its syntax is checked and any errors

are displayed in red. At this point, you can continue editing the table and

postpone the correction of errors to a later stage.

All the usual functions in the Edit menu are available to you when editing a

table. Using the context-sensitive right mouse button makes editing easier.

The menu displayed with the right mouse button also helps you to enter the

data type. The “Data Type” menu includes all elementary data types.

You can select single rows by clicking the write-protected address cell. You

can also select several rows of the same declaration type by holding down the

SHIFT key. The selected rows appear on a black background.

The “Decl.” column is read-only. The declaration type is determined by the

position of the declaration within the table. This ensures that variables can

only be entered in the correct order of their declaration types. If you want to

change the declaration type of a declaration, cut the declaration first and then

paste it under the new declaration type.

If you want to enter a structure as a variable, enter the name in the “Symbol”

column and the keyword

STRUCT in the data type column. Press either the

TAB or the RETURN key to insert an empty row plus a final row

(END_STRUCT) for the structure. In the empty row, enter the elements of

the structure by entering its name, data type and its initial value (optional).

You can create more rows and insert further elements using either the menu

commands or by pressing

RETURN.

If you want to select a structure, click the address or declaration cell of the

first or last row of the structure (containing the keyword

STRUCT or

END_STRUCT). You can select individual declarations within a structure by

clicking the address cell in the relevant row.

If you want to enter a structure within another structure, the hierarchy is

indicated by the indented variable names.

Procedure

Editing Functions

Changing the

Declaration Type

Entering

Structures

Creating Logic Blocks

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