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Automation– and Drive Technology- SCE

10. The Data Block is generated with a symbol Name. The Type, an Initial value as well as a

Comment (optional) are entered.

The address is automatically generated and cannot be altered.

The data block can be saved

and downloaded into the PLC . The mode switch on the

PLC must be on STOP! (® Name® Type ® Initial value ® Comment ®

® )

Note: If the data block is assigned as a local instance DB to a FB, the declarations table of the

FB declares the structure of the DB.

Comment for

documentation

( optional ).

Initial value , to which

the data type must be

compatible ( optional ).

Desired data

type (see below)

for your data

element.

Symbolic name

which is referenced

to the absolute

address.

The absolute address is created from

STEP 7, when the DB is compiled or

saved.

The address format is BYTE, BIT.

Over this address, the data elements can

also be accessed. (e.g. over download-

and compile operations or in logical

operations.).

T I A Training document Page 13 of 18 Module B4

Last revision: 02/2002 Data blocks

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Siemens B4 Manual do Utilizador Página 13