Omron CJ1G-CPUxx, Instructions Manual

Page: 592 / 1144

571
Double-precision Floating-point Instructions (CS1-H, CJ1-H, CJ1M, or CS1D Only)
Section 3-16
Data Format Floating-point data expresses real numbers using a sign, exponent, and man-
tissa. When data is expressed in floating-point format, the following formula
applies.
Real number = (–1)
s
2
e–1,023
(1.f)
s: Sign
e: Exponent
f: Mantissa
The floating-point data format conforms to the IEEE754 standards. Data is
expressed in 32 bits, as follows:
Number of Digits The number of effective digits for floating-point data is 53 bits for binary
(approximately 15 digits decimal).
Floating-point Data The following data can be expressed by floating-point data:
• –
∞
• –1.79769313486232 x 10
308
≤
value
≤
–2.22507385850720 x 10
–308
• 0
• 2.22507385850720 x 10
–308
≤
value
≤
1.79769313486232 x 10
30
DOUBLE FLOATING-POINT DIVIDE /D 848 589
DOUBLE DEGREES TO RADIANS RADD 849 591
DOUBLE RADIANS TO DEGREES DEGD 850 593
DOUBLE SINE SIND 851 594
DOUBLE COSINE COSD 852 596
DOUBLE TANGENT TAND 853 598
DOUBLE ARC SINE ASIND 854 600
DOUBLE ARC COSINE ACOSD 855 602
DOUBLE ARC TANGENT ATAND 856 604
DOUBLE SQUARE ROOT SQRTD 857 606
DOUBLE EXPONENT EXPD 858 608
DOUBLE LOGARITHM LOGD 859 610
DOUBLE EXPONENTIAL POWER PWRD 860 612
Double-precision Floating-point Symbol
Comparison Instructions LD, AND,
OR
+
=D, <>D,
<D, <=D,
>D, or >=D 335 to 340 614
Instruction Mnemonic Function code Page
Data No. of bits Contents
s: sign 1 0: positive; 1: negative
e: exponent 11 The exponent (e) value ranges from 0 to 2,047.
The actual exponent is the value remaining after
1,023 is subtracted from e, resulting in a range
of –1,023 to 1,024. “e=0” and “e=2,047” express
special numbers.
f: mantissa 52 The mantissa portion of binary floating-point
data fits the format 2.0 > 1.f
≥
1.0.
Sign
s e f
Exponent Mantissa
63 62 52 51 0