Vigor VS Series - Page 274

268
D L O G E P
S
D
1
2
M
3
○○○
FNC
125
X Y M S
D.b R.b
KnX KnY
KnM KnS
T C
D,R
V,Z
UnG
K,H
E
" $"
S
D
DLOGEP D0 D10
X0
S
D
S
D
S
S
S>0
○
Operand
Devices
BIN Floating Point Nature Logarithm
log
e
10
In 10=
=
2.302585
(D1, D0) BIN floating number
(D11, D10) BIN floating number
S : the source device to be performed the natural logarithmic operation
D : the destination device to store the natural logarithmic result
This instruction performs the natural logarithmic operation on a BIN oating point number that is designated by
and stores the BIN oating point format result in the designated device.
When X0 = “OFF” → “ON”, this instruction performs the natural logarithmic operation on the BIN oating point
number in (D1, D0) as the logarithm to the base of the mathematical constant e, and the result will be stored in
(D11, D10).
S
This instruction is based on the constant base e = 2.71828 to perform the natural logarithm function.
This instruction is a 32-bit instruction. Therefore, be sure to input DLOGEP or DLOGEP in the program.
The source operand must assign to a BIN oating point number for the calculation.
The format for storing a oating point number will occupy two Registers in the PLC system. Please refer to the
section 2-13 “Numerical System” for the reference of the oating point number.
If the value of is less than or equal to zero, the PLC will regard that as an operational error. Therefore, the
must designate to a positive number.