6.5.11 Real number to string
Input/output Operand
Data type
IN
VD, ID, QD, MD, SD, SMD, LD, constant, AC, *VD, *LD, *AC
Real number
FMT
VB, IB, QB, MB, SB, SMB, LB, constant, AC, *VD, *LD, *AC
Byte
OUT
VB, LB, *VD, *AC, *LD
String
R - S:Instruction converts the real number value to a ASCII
string.(FMT) format specifies the conversion accuracy of
the right of the decimal point.
The conversion result is placed in a string starting with
OUT.The output string length specified in the format can
be 3 to 15 characters.The format of real numbers used in
PLC is at most 7 digits.
Illegal format:
nnn > 5
ssss < 3
ssss < Required number of characters
ASCII constant string data type format ：
String is a series of characters, each character is stored as a byte.The first byte of a
string defines the length of the string, that is the number of characters.If a constant
string is entered directly into the program editor or data block, the string must start
and end with double quotation marks ("string constant").
The following memory map shows the format of the string data type.The length of a
string can be between 0 and 254 characters.The maximum length of the string is 255
bytes. String length
Character 1
Character 2
Character 5
Character 254
Character
Character
..................................
3
4
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 254
99
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