Standard function blocks
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02/16 MN05013001Z EN
Memory requirement
The data block function block requires 36 bytes of memory
plus 4 bytes per constant at the function block input.
Retention
Data function blocks can be operated with retentive actual
values. The quantity can be selected in the SYSTEM
r
RETENTION menu.
Operation of the function block
The value at input >I1 is only transferred with a rising trigger
edge to an operand (e.g.: MD42) at output QV>. It contains
the value up to the next time it is overwritten.
Figure 97:
Signal diagram of data function block
1: Value at input DB..>I1
2: Trigger coil DB…T_
3: Value on DB…QV>
2
3
1
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