Code Converter : B4 - Fb240 - - Siemens SIMATIC S5-100U System Manual

Integrated Blocks and Their Functions

9.2.1 Code Converter : B4 - FB240 -

Use function block FB240 to convert a number in BCD (4 tetrads) with sign to a fixed-point binary
number (16 bits).
You must change a two-tetrad number to a four-tetrad number before you convert it.
• If a tetrad is not in the BCD defined range, then FB240 displays the value "0". An error bit
message does not follow.
Table 9-2. Call and Parameter Assignments of FB240
Parameter
BCD BCD number
SBCD Sign of the
BCD number
DUAL Fixed-point
number (KF)
9.2.2 Code Converter : 16
Use function block FB 241 to convert a fixed-point binary number (16 bits) to a number in BCD code
with additional consideration of the sign
word before conversion.
Table 9-3. Call and Parameter Assignments of FB241
Parameter
DUAL Binary number
SBCD Sign of the BCD
BCD2 BCD number 4th and
5th tetrads
BCD1 BCD number tetrads
9-12
Meaning Type
I W
I BI
Q W
- FB241-
.
An eight-bit binary number must be transferred to a 16-bit
Meaning Type
W
I
I BI
number
Q BY
Q W
0 to 3
Assignment
0 to 9999
-
"1" for "-"
NAME
"0" for "+" BCD
SBCD
16 bits "0"
DUAL
or "1"
Assignment
-32768 to+32767
"1" for "-" NAME
"0" for "+"
DUAL
SBCD
2 tetrads
BCD2
BCD1
4 tetrads
S5-100U
STL
: JU FB240
: COD:B4
:
:
:
STL
: JU FB241
: COD:16
:
:
:
:
EWA 4NEB 812 6120-02b