Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual Float natural logarithm operation

DVP - ES2/EX2/SS2/SA2/SX2/SE Operation Manual - Programming

API Mnemonic Operands Function Controllers

125

D

LN

P

Float natural logarithm operation

ES2/EX2 SS2 SA2 SX2

SE

Type

Bit Devices

Word devices

Program Steps

OP

X

Y

M

S

K

H KnX KnY KnM KnS T

C

D

E

F DLN, DLNP: 9 steps

S

*

*

*

D

*

PULSE

16-bit

32-bit

SA2

SA2

SA2

ES2/EX2 SS2 SE SX2 ES2/EX2 SS2

SE

SX2 ES2/EX2 SS2 SE

SX2

Operands:

S: Source device D: Operation result

Explanations:

1.Perform natural logarithm (LN) operation on operand S: LN[S +1, S ]=[ D +1, D ]

2.Only a positive number is valid for S. Register D has to be 32-bit format. Operation is conducted in floating point value, so the value in S needs to be converted into floating value before natural logarithm operation.

3.eD = S. The content of D = LN S, where the value in S is specified by users.

4.Flags: M1020 (Zero flag), M1021 (Borrow flag) and M1022 (Carry flag).

If absolute value of the result is larger than max. floating value, carry flag M1022 = ON.

If absolute value of the result is smaller than min. floating value, borrow flag M1021 = ON. If the conversion result is 0, zero flag M1020 = ON

Program Example:

1.When M0 = ON, convert (D1, D0) to binary floating value and save the result in (D11, D10).

2.When M1= ON, perform natural logarithm operation with (D11, D10) as the antilogarithm. The value is saved in register (D21, D20) in binary floating format.

3.When M2 = ON, convert the value in (D21, D20) into decimal floating point value and save the result in (D31, D30). (At this time, D31 indicates powers of 10 for D30)

M0

RST M1081

DFLT D0 D10

M1

DLN D10 D20

M2

DEBCD D20 D30

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