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IP 240 Positioning

10.23 Data Block Contents and Initializing the Standard Function Blocks

10.23.1 The Data Block

Creating the data block

The standard function blocks (configuring FB and control FB) use a data block (DB) to interchange

data with the IP 240. You must create this data block and enter the required data prior to the first

FB call.

The length of the data block depends on the number of positions you want to store. The

minimum length is 60 data words (data word 0 to data word 59), and increases by 3 words for

each position. If, for instance, 65 positions are entered, the data block must comprise

60+3

65=255 data words (data word 0 to data word 254). For 254 positions, the data block

would have to comprise 822 data words.

When the configuring FB is invoked, the length of the DB is checked on the basis of the number of

positions to be transferred, which is in DR 58. When the control FB is invoked to change the

position data, the length of the DB is checked on the basis of the entry number specified in the

FKT parameter. If there is a discrepancy, the FB sets bit 2 in the PAFE byte.

Note that data words from DW 256 on can be addressed only with supplementary STEP 5

commands (system operations), e.g. ”LIR” and ”TIR” ( Section 10.24).

In the S5-135U and S5-155U, you can also create the data block in the extended DB area (DX area).

Specifying the data block number

The data block number is specified in the DBNR parameter.

During configuring, you must specify the number of the data block created. FB 167 opens this

data block.

After configuring you can either

• use a DB that is already opened. In the S5 115U, this function is only available from CPU 943

onwards.

• or specify the DB number, so that the DB is opened by FB 168.

The FB is to open the data block you created:

S5-115U and S5-150U S5-135U and S5-155U

: JU FB167 : JU FB 168

NAME : STRU.POS NAME : STEU.POS

DBNR : KF y DBNR : KF y

: JU FB167 : JU FB 168

NAME : STRU.POS NAME : STEU.POS

DBNR : KY x,y DBNR : KY x,y

y=3 to 255 Number of the data blockcreated

x=0 DB created in normal DB area

x=1 DB created in extended DB area

The data block that was already opened is to be used:

S5-115U and S5-150U S5-135U and S5-155U

: JU FB 168

NAME : STEU.POS

DBNR : KF y

: JU FB 168

NAME : STEU.POS

DBNR : KY x,y

y=0 the data block that was already opened is to be used

x=0 Regardless of whether the DB was created in the normal or in the extended DB area

EWA 4NEB 811 6120-02a

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Siemens IP-Module Especificaciones Pagina 241

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