String Conversion Instructions - Siemens Simatic S7-200 System Manual

S7-200 Programmable Controller System Manual

String Conversion Instructions

Converting Numerical Values to String
The Integer to String (ITS), Double Integer to String (DTS), and Real
to String (RTS) instructions convert integers, double integers, or real
number values (IN) to an ASCII string (OUT).
Operation of the Integer to String
The Integer to String instruction (ITS) converts an integer word IN to
an ASCII string with a length of 8 characters. The format (FMT)
specifies the conversion 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.
See the section, format for strings in Chapter 4 for more information.
Error conditions that set ENO = 0
H 0006 (indirect address)
H 0091 (operand out of range)
6
H Illegal format (nnn > 5)
Figure 6-17 describes the format operand for the Integer to String
instruction. 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 specified by the nnn field. The valid range of the nnn field is
0 to 5. Specifying 0 digits to the right of the decimal point causes the
value to be displayed 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 the whole number and the
fraction. The upper 4 bits of the format must be zero.
Figure 6-17 also shows examples of values that are formatted using
a decimal point (c= 0) with three digits to the right of the decimal
point (nnn = 011).The value at OUT is the length of the string.
The output string is formatted according to the following rules:
-
Positive values are written to the output buffer without a sign.
-
Negative values are written to the output buffer with a leading minus sign (–).
-
Leading zeros to the left of the decimal point (except the digit adjacent to the decimal point) are
suppressed.
-
Values are right-justified in the output string.
Table 6-18
Inputs/Outputs
IN
INDX, FMT
OUT
100
Valid Operands for the Instructions That Convert Numerical Values to Strings
Data Type Operands
BYTE (String) VB, LB, *VD, *LD, *AC
INT IW, QW, VW, MW, SMW, SW, T, C, LW, AIW, *VD, *LD, *AC, Constant
DINT ID, QD, VD, MD, SMD, SD, LD, AC, HC, *VD, *LD, *AC, Constant
REAL ID, QD, VD, MD, SMD, SD, LD, AC, *VD, *LD, *AC, Constant
BYTE IB, QB, VB, MB, SMB, SB, LB, AC, *VD, *LD, *AC, Constant
BYTE (String) VB, LB, *VD, *LD, *AC
INT IW, QW, VW, MW, SMW, SW, T, C, LW, AC, AQW, *VD, *LD, *AC
DINT, REAL ID, QD, VD, MD, SMD, SD, LD, AC, *VD, *LD, *AC