Ln_ - Natural Logarithm; Log_ - Logarithm Base 10 - Siemens 353 User Manual

Function Blocks

3.2.47 LN_ - NATURAL LOGARITHM

LN_ function blocks will output the natural logarithm of input X.
When the input is <= 0.0, the input will be treated as the smallest
number greater than 0.0 (i.e. 1.17....e-38) and the LN will be computed
accordingly.
X
LNe (X)
.
Input X
BLOCK DIAGRAM

3.2.48 LOG_ - LOGARITHM BASE 10

LOG__ function blocks will output the logarithm to the base 10
of input X. When the input is <= 0.0, the input will be treated as
the smallest number greater than 0.0 (i.e. 1.17....e-38) and the
LOG will be computed accordingly.
X LOG
.
Input X
BLOCK DIAGRAM
3-48
O1
Output 1
.
(X) O1
10
Output 1
NATURAL LOGARITHM
Input X
I N P
LOGARITHM BASE 10
X
Input X
I N P U T
E S N
.
UM353-1B
LN
ESN = 000
X
O1 Output 1
O =LNe (X)
1
U T X
INPUT X ..............
loop tag.block tag.output
E S N
Exec. Seq. No. ..................... 000 to 250
LOG ESN = 000
O1 O utput 1
O = LOG (X)
1
X
INPUT X ..............
loop tag.block tag.output
E xec. S eq. N o. ..................... 000 to 250
April 2012
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(000)
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