Siemens S7-1200 System Manual page 298

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Table of Contents

Extended instructions

8.2 String and character

The value represented by parameter IN is converted to a string referenced by parameter

OUT. The parameter OUT must be a valid string before the conversion is executed.

The converted string will replace characters in the OUT string starting at character offset

count P to the number of characters specified by parameter SIZE. The number of characters

in SIZE must fit within the OUT string length, counting from character position P. This

instruction is useful for embedding number characters into a text string. For example, you

can put the numbers "120" into the string "Pump pressure = 120 psi".

Parameter PREC specifies the precision or number of digits for the fractional part of the

string. If the parameter IN value is an integer, then PREC specifies the location of the

decimal point. For example, if the data value is 123 and PREC = 1, then the result is "12.3".

The maximum supported precision for the Real data type is 7 digits.

If parameter P is greater than the current size of the OUT string, then spaces are added, up

to position P, and the result is appended to the end of the string. The conversion ends if the

maximum OUT string length is reached.

The FORMAT parameter for the VAL_STRG instruction is defined below. The unused bit

positions must be set to zero.

s = Number sign character

f = Notation format

r = Decimal point format

Values of the FORMAT parameter

FORMAT (WORD)

W#16#0008 to W#16#FFFF

Format of the VAL_STRG instruction

Number sign character

Illegal values

1= use sign character "+" and "-"

0 = use sign character "-" only

1= Exponential notation

0 = Fixed point notation

1 = "," (comma character)

0 = "." (period character)

Notation format

Decimal point representation

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG