Omron SYSMAC CJ - REFERENCE MANUAL 01-2008 Reference Manual page 683

Floating-point Math Instructions
Storage of ASCII Text
After the floating-point number is converted to ASCII text, the ASCII characters are stored in the destina-
tion words beginning with D, as shown in the following diagrams. Different storage methods are used for
decimal notation and scientific notation.
Decimal notation (C=0000 hex)
Total number of characters
Integer part Fractional part
Sign
Decimal point
.
A decimal point (ASCII: 2E hex) is added if the number fractional digits is greater than 0.
Spaces (ASCII: 20 hex) are added if the integer part of the floating-point data is shorter than the integer part of the result
(total number of characters - sign digit - decimal point - fractional digits).
Positive number: Space (20 hex)
Negative number: Minus sign (2D hex)
Scientific notation (C=0001 hex)
Total number of characters
Fractional
Exponential part
Integer part
part
Sign Sign
Decimal point
. E
Letter E (ASCII: 45 hex) is written here.
If there are more fractional digits in the source data than specified in C+1, the extra digits will be rounded off.
If there are fewer fractional digits, zeroes (ASCII: 30 hex) will added to the end of the source data.
A decimal point (ASCII: 2E hex) is added if the number fractional digits is greater than 0.
Spaces (ASCII: 20 hex) are added if the integer part of the floating-point data is shorter than the integer part of the result (total
number of characters - sign digit - decimal point - fractional digits - E digit).
Positive number: Space (20 hex)
Negative number: Minus sign (2D hex)
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If there are more fractional digits in the source data than specified in C+1, the extra digits will be rounded
off. If there are fewer fractional digits, zeroes (ASCII: 30 hex) will added to the end of the source data.
0 to 9 are written as 00 to 09.
Positive: Plus sign (2B hex)
Negative: Minus sign (2D hex)
Note Either one or two bytes of zeroes are added to the end of ASCII text as an end
code.
Total number of characters odd: 00 hex is stored after the ASCII text.
Total number of characters even: 0000 hex is stored after the ASCII text.
Limits on the Number of ASCII Characters
There are limits on the number of ASCII characters in the converted number.
The Error Flag will be turned ON if the number of characters exceeds the
maximum allowed.
1. Limits on the Total Number of ASCII Characters
a) Decimal Notation (C = 0000 hex)
• When there is no fractional part (C+2 = 0000 hex):
2 Total Characters
• When there is a fractional part (C+2 = 0001 to 0007 hex):
(Fractional digits + 3)
b) Scientific Notation (C = 0001 hex)
• When there is no fractional part (C+2 = 0000 hex):
6 Total Characters
• When there is a fractional part (C+2 = 0001 to 0007 hex):
(Fractional digits + 7)
2. Limits on the Number of Digits in the Integer Part
24
Total Characters 24
24
Total Characters 24
Section 3-15