Arithmetic Blocks - Siemens SIMATIC S5 Manual

S5-115F Manual
6.1.2

Arithmetic Blocks

Use function blocks FB 242 and FB 243 to multiply and divide.
Multiplier: 16 -FB 242-
Use function block FB 242 to multiply one fixed-point binary number (16 bits) by another. The
product is represented by two fixed-point binary numbers (16 bits). The result is also scanned for
zero. An eight-bit number must be changed to a 16-bit word before multiplication.
Call and Parameter Assignment
Parameter Type
Z1 I
Z2 I
Z3=0 Q
Z32 Q
Z31 Q
Divider:16 -FB243-
Use function block FB 243 to divide one fixed-point binary number (16 bits) by another. The result
(quotient and remainder) is represented by two fixed-point binary numbers (16 bits each). The
divisor and the result are also scanned for zero. An eight-bit number must be changed to a 16-bit
word before division.
EWA 4NEB 811 6149-02
Data Assignment
Type
W -32768 to +32767
W
-32768 to +32767
Bi
"1" if the product
is zero
W
16 bits
W
16 bits
Meaning
Multiplier
Multiplicand
Name : MUL : 16
Z1
Scan for
zero
Z2
Z3=0
Product
high word
Z32
Z31
Product
low word
Blocks
STL
: JU FB 242
:
:
:
:
:
6-3