Siemens SIMATIC S7-1200 - Page 350

Extended instructions
9.2 String and character
S7-1200 Programmable controller
350 System Manual, V4.2, 09/2016, A5E02486680-AK
Conversion begins in the string IN at character offset P and continues until the end of the
string, or until the first character is encountered that is not "+", "-", ".", ",", "e", "E", or "0" to
"9". The result is placed at the location specified in parameter OUT.
String data must be initialized before execution as a valid string in memory.
The FORMAT parameter for the STRG_VAL instruction is defined below. The unused bit
positions must be set to zero.
Table 9- 24 Format of the STRG_VAL instruction
Bit
16
Bit 8
Bit 7
Bit 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
f
r
f = Notation format
1= Exponential notation
0 = Fixed point notation
r = Decimal point format
1 = "," (comma character)
0 = "." (period character)
Table 9- 25 Values of the FORMAT parameter
FORMAT (W#16#)
Notation format
Decimal point representation
0000 (default)
Fixed point
"."
0001
","
0002
Exponential
"."
0003
","
0004 to FFFF
Illegal values
Rules for STRG_VAL conversion:
● If the period character "." is used for the decimal point, then commas "," to the left of the
decimal point are interpreted as thousands separator characters. The comma characters
are allowed and ignored.
● If the comma character "," is used for the decimal point, then periods "." to the left of the
decimal point are interpreted as thousands separator characters. These period
characters are allowed and ignored.
● Leading spaces are ignored.