8 Application Instructions API 100-149
DVP-PLC Application Manual
8-36
API Mnemonic Operands
Function
125
D LN P
Natural Logarithm of Binary Floating Point
Controllers
ES/EX/SS SA/SX/SC EH/SV
Bit Devices
Word Devices
Program Steps
Type
OP
X Y M S K H
KnX
KnY KnM KnS T
C
D
E
F
S
*
*
*
D
*
DLN, DLNP: 9 steps
PULSE 16-bit 32-bit
ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV
Operands:
S
: Device for operation source
D
: Device for operation result
Explanations:
1. See the specifications of each model for their range of use.
2. Flags: M1020 (zero flag); M1021 (borrow flag); M1022 (carry flag)
3. This instruction performs natural logarithm “LN” operation by
S
: LN
[
S
+ 1,
S
]
=
[
D
+ 1,
D
]
4. Only positive values are valid for
S
. When designating
D
registers, the data should be 32-bit and the operation
should be performed in floating point system. Therefore,
S
should be converted into a floating point value.
5. e
D
=
S
.The content in
D
= ln
S
;
S
= designated source data.
6. If the absolute value of the result
>
maximum floating point available, the carry flag M1022 = On.
7. If the absolute value of the result
<
minimum floating point available, the borrow flag M1021 = On.
8. If the result = 0, the zero flag M1020 = On.
Program Example:
1. When M0 = On, convert (D1, D0) into binary floating point and store it in register (D11, D10).
2. When M1= On, use register (D11, D10) as the real number for LN operation and store the binary floating point
result in register (D21, D20).
3. When M2 = On, convert the binary floating point (D21, D20) into decimal floating point (D30
× 10
[D31]
)
and store
it in register (D31, D30).
M0
RST
M1081
M1
DLN
D10
D20
M2
DEBCD
D20
D30
DFLT
D0
D10
Remarks:
For floating point operations, see “5.3 Handling of Numeric Values”.
Содержание DVP-PLC
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