Program instructions
7.5 Convert
S7-200 SMART
246
System Manual, V2.3, 07/2017, A5E03822230-AF
ASCII output number format
●
Positive values are written to the output buffer without a sign.
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Negative values are written to the output buffer with a leading minus sign (-).
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Leading zeros to the left of the decimal point (except the digit adjacent to the decimal
point) are suppressed.
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Values are right-justified in the output string.
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Real numbers: Values to the right of the decimal point are rounded to fit in the specified
number of digits to the right of the decimal point.
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Real numbers: The size of the output string must be a minimum of three bytes more than
the number of digits to the right of the decimal point.
Integer to string conversion
LAD / FBD
STL
Description
ITS IN, OUT, FMT
The Integer to String instruction converts an integer word IN to an ASCII
string with a length of 8 characters. The format (FMT) assigns the conver-
sion precision to the right of the decimal, and whether the decimal point is
to be shown as a comma or a period. The resulting string is written to 9
consecutive bytes starting at OUT.
Non-fatal error conditions with ENO = 0
SM bits affected
•
0006H indirect address
•
0091H operand out of range
•
Illegal format (nnn > 5)
•
FMT bit is not zero for the four most signif-
icant bits of the FMT byte
None
Input / output
Data type
Operand
IN
INT
IW, QW, VW, MW, SMW, SW, T, C, LW, AC, AIW, *VD, *LD, *AC, Con-
stant
FMT
BYTE
IB, QB, VB, MB, SMB, SB, LB, AC, *VD, *LD, *AC, Constant
OUT
STRING
VB, LB, *VD, *LD, *AC
The length of the output string is always 8 characters. The number of digits to the right of the
decimal point in the output buffer is assigned by the nnn field. The valid range of the nnn
field is 0 to 5. If you assign 0 digits to the right of the decimal point, then the value is
converted without a decimal point. For values of nnn greater than 5, the output is a string of
8 ASCII space characters. The c bit specifies the use of either a comma (c=1) or a decimal
point (c=0) as the separator between whole number and fraction. The most significant 4 bits
of the format must be zero.
