Siemens NAN 67 Series Wartungshandbuch PDF herunterladen (Seite 33)

3-9

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

C79000-G7076-C504-02

To enter an array as a data type, enter the name in the “Symbol” column and

the keyword ARRAY in the cell for the data type together with the array size,

for example array [1..20, 3..24] for a two-dimensional array. Press the

TAB

key (if necessary, more than once) to insert a row in which you can enter the

data type of the array.

If you want to select an array, click the address cell in the relevant row.

Initial values for each array element can be entered singly or with a repetition

factor (see Figure 3-4):

S Individual entry: You assign each element its own initial value. The

values are separated by commas.

S Repetition factor: The same initial value can be assigned to several

elements. The value itself is shown in parentheses and is preceded by the

repetition factor which defines the number of elements.

Figure 3-4 shows an example of a variable declaration table:

TRAFFIC\...\FB50 - <Offline>

Address Decl. Symbol Data Type Initial Value Comment

structur1

var1

var2

STRUCT

BOOL

INT

FALSE

0.0

+0.0

+2.0

+4.0

=6.0

var3 WORD

array1 ARRAY[1..20,1..40]in6.0

BOOL

TRUE

in*2.0

W#16#0

END_STRUCT

Figure 3-4 Structures and Arrays in a Variable Declaration Table

Note

If you make changes to the variable declaration of blocks whose calls you

have already programmed, time stamp conflicts may occur. You should

therefore first program all blocks to be called, and then program the blocks

that call them. In the case of function blocks, instance DBs should also be

re-created.

When making changes to a UDT which was entered as a data type in a

variable declaration, check the variable declaration of the block and then

save it again.

Entering Arrays

Example

Creating Logic Blocks

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 317 318

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