FC 174 - Logarithm

The logarithm function code takes the logarithm of the input to the defined base. The result is multiplied by a gain factor to provide the output. The logarithm function code is not limited to natural logarithms. The log of any value in base zero (natural) to ten can be taken.

 

Use the logarithm function code in process control for performance calculations and monitoring.

 

Outputs:

Blk

Type

Description

N

R

Value = K x [ log(base)(X) ]

 

 

Specifications:

Spec

Tune

Default

Type

Range

Description

S1

N

6

I

Note 1

Block address of input value X

S2

N

0

I

0 - 10

Base of logarithm:

0 = natural log

S2

Y

1.000

R

Full

Gain factor

 

NOTES:

1. Maximum values are:9,998 for the BRC-100, IMMFP11/12 and 31,998 for the HAC