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7-298

LOGD(P)

7.12.24

Natural logarithm operation on floating-point data
(Double precision) (LOGD(P))

LOGD(P)

Function

(1) Returns the natural logarithm of the value designated by

taking (e) as base, and stores

operation results at device designated by

(2) Only positive values can be designated by

. (Operation cannot be performed on negative

numbers.)

(3) When the operation results in -0 or an underflow, the result is processed as 0.

Operation Error

(1) In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and

an error code is stored into SD0.
• The value designated by

is negative.

(Error code: 4100)

• The value designated by

is 0.

(Error code: 4100)

• The value of the specified device is not in the following range:

(Error code: 4140)

0,2

-1022

| value of specified device | < 2

1024

• The value of the designated device is 0.

(Error code: 4140)

• The result exceeds the following range (Operation results in an overflow):

1024

| Operation result |

(Error code: 4141)

: Data of which the natural logarithm is obtained or head number of the devices where the data is stored

(real number)

: Head number of the devices where the operation result will be stored (real number)

Settiing

Data

Internal Devices

R, ZR

Constants

Other

Bit

Word

Bit

Word

––

Universal

Basic

Process

High

performance

Redundant

Command

LOGDP

LOGD

LOGDP

LOGD

log

(

)

(

)

64-bit floating-point
real number