Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 39)

L-force | PLC Designer
What is What in PLC Designer

DMS 3.2 EN 02/2011 TD29 37
4.1.4 Function Block
A function block is a POU which provides one or more values during the procedure.
As opposed to a function, a function block provides no return value.
A function block declaration begins with the keyword FUNCTION_BLOCK. Regard the
Recommendations on the naming.
Reproductions or instances (copies) of a function block can be created.
The call of a function block is done via a function block instance.
Example in IL of a function block with two input variables and two output variables:
One output (iMulErg) is the product of the two inputs, the other (xVergl) is a
comparison for equality:
Declaration part:
FUNCTION_BLOCK FUB
VAR_INPUT
iPar1:INT;
iPar2:INT;
END_VAR
VAR_OUTPUT
iMulErg:INT;
xVergl:BOOL;
END_VAR
Implementation part in IL:
LD iPar1
MUL iPar2
ST iMulErg
LD iPar1
EQ iPar2
ST xVergl