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Logarithmic Function (32 Bits) - Siemens CPU 412-1 Instruction Manual

S7-400; cpu 412 series; cpu 414 series; cpu 416 series; cpu 417 series;.
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Logarithmic Function (32 Bits)

The result of the logarithmic function is in ACCU1. The instructions can be interrupted.
Instruc-
Instruc-
Address
Address
tion
ID
LN
Form the natural logarithm of a
real number in ACCU1
EXP
Calculate the exponential value
of a real number in ACCU1 to the
base e (= 2.71828)
Status word for:
LN, EXP
Instruction evaluates:
Instruction affects:
S7-400 Instruction List
A5E00267845-01
Length
Length
Description
Description
in
in
Words
1
1
BR
CC1
Yes
Logarithmic Function (32 Bits)
Execution Time in ms
CPU 412
CPU 414
20
13
21
15
CC0
OV
OS
Yes
Yes
Yes
CPU 416
CPU 417
9
7
10
8
OR
STA
RLO
/FC
68

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