Delta DVP-ES2 User Manual download pdf (Page 424)

100

101

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

3-308

API Mnemonic Operands Function

125

D LN P

Float natural logarithm operation

Controllers

ES2/EX2 SS2 SA2

SX2

Bit Devices Word devices Program Steps Type

X Y M S K H KnX KnY KnM KnS T C D E F

* * *

D *

DLN, DLNP: 9 steps

PULSE 16-bit 32-bit

ES2/EX2 SS2

SA2

SX2 ES2/EX2 SS2

SA2

SX2 ES2/EX2 SS2

SA2

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. e

= 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)

RST M1081

DLN D10 D20

DEBCD D20 D30

DFLT D0 D10

1 2 ... 419 420 421 422 423 424 425 426 427 428 429 ... 701 702

Delta DVP-ES2 User Manual Page 424

Comments to this Manuals