Delta DVP-ES2 User Manual download pdf (Page 425)

100

101

3. Instruction Set

3-309

API Mnemonic Operands Function

126

D LOG P

Float 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 *

DLOG, DLOGP: 13 steps

PULSE 16-bit 32-bit

ES2/EX2 SS2

SA2

SX2 ES2/EX2 SS2

SA2

SX2 ES2/EX2 SS2

SA2

SX2

Operands:

: Base S

: Antilogarithm D: Operation result

Explanations:

1. Perform logarithm operation with S

as the base and S

as the antilogarithm and save the

result in 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 logarithm operation.

3. Logarithm operation: S

= S

, D = ?  Log

= D

Example: Assume S

= 5, S

= 125, S

= S

, D = ?  5

= 125  D = Log

= log

125

= 3.

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) and (D3, D2) to binary floating value and save the result in

2. When M1= ON, perform logarithm operation with (D11, D10) as base and (D13, D12) as

antilogarithm. The results are 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)

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Delta DVP-ES2 User Manual Page 425

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