Inovance H3U Series - Binary Floating-Point Natural Logarithm

143
4
4 Instructions 4.4.5 Exponent Operations
◆
Operands
Operand
Bit Element Word Element
System·User System·User Bit Designation Indexed Address Constant
Real
Number
S X Y M T C S SM D R T C SD KnX KnY KnM KnS KnSM
V,Z
Modication K H E
D X Y M T C S SM D R T C SD KnX KnY KnM KnS KnSM
V,Z
Modication K H E
Note: The elements in gray background are supported.
◆
Function
Exponentiation is performed on the mathematical constant e (approximately equal to 2.71828). The
exponent is a binary oating-point number.
S is the binary oating-point variable used as the exponent.
D is the unit that stores the result of exponentiation.
Note: An error occurs when the result exceeds the range [2
-126
, 2
128
). The error code is K6706 and stored in
D8067. The error ag M8067 is set to ON to identify this error.
Example:
X0
ǒDEXP D0 D2Ǔ
S D
X1
ǒDEXPP D10 D12Ǔ
When X0 = ON, exponentiation is performed on the mathematical
constant e. The exponent is the binary floating-point number in
(D1, D0). The result is stored in (D3, D2). e(D1, D0) -> (D3, D2).
Because loge2128 = 88.7, when the value in (D1, D0) is greater
than 88.7, then D8067 = K6706 and M8067 = ON.
LOGE: Binary oating-point natural logarithm operation
◆
Overview
The LOGE instruction calculates the natural logarithm of a binary oating-point number with the
mathematical constant e (approximately equal to 2.71828) as the base.
LOGE S D
Binary oating-point
natural logarithm
operation
Applicable model:
H3U
S Data source
Binary oating-point variable whose natural logarithm is
to be calculated
32-bit instruction
(9 steps)
DLOGE:
Continuous
execution
DLOGEP: Pulse
execution
D
Operation
result
Unit that stores the calculated natural logarithm