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Delta DVP-PLC User Manual

Delta DVP-PLC
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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: LNS + 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 = lnS; S = designated source data.
6. If the absolute value of the resultmaximum floating point available, the carry flag M1022 = On.
7. If the absolute value of the resultminimum 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”.

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Delta DVP-PLC Specifications

General IconGeneral
ManufacturerDelta Electronics
ModelDVP-PLC
CategoryController
Humidity5% to 95% RH, non-condensing
Programming LanguageLadder Diagram (LD), Instruction List (IL), Sequential Function Chart (SFC)
CPU TypeVarious, depending on the specific model within the DVP series (e.g., ES2, EX2, SX2, SA2, EH3, etc.)
Operating TemperatureTypically 0°C to 55°C (32°F to 131°F)
Storage TemperatureTypically -25°C to 70°C (-13°F to 158°F)

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