Siemens SIMATIC S5 Manual page 93

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S5-115F Manual
Input
0000
:
KH =
0001
:
KT =
0003
:
KF =
Data blocks can also be created or erased in the control program ( 3.1.8).
Program processing with data blocks
A data block must be called in the program with the C DB x operation (x = block No.).
Within a block, a data block remains valid until another data block is called.
When the program returns to the block that issued the call, the data block that was valid
before the block call is again valid.
Valid
DB
PB 7
C DB 10
DB 10
JU PB 20
DB 10
When PB 20 is called, the valid data area is entered in a memory.
When the program returns to the calling block, this area is reopened.
EWA 4NEB 811 6149-02
A13C
100.2
+21874
Figure 2-8. Data Block Contents
Figure 2-9. Validity Areas of Data Blocks
Introduction to STEP 5
Stored Values
DW0
DW1
DW2
Valid
PB 20
DB
DB 10
C DB 11
DB 11
A13C
2100
5572
2-19

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