Publication 1766-RM001A-EN-P - October 2008
Math Instructions
227
LN - Natural Log
Instruction Type: output
RAD Instruction Operation
Inputs
Conditions
Output
Source Type
Destination
Type
S:2/14
S:0/3-0
S, Z, V, C
S:5/0
Destination
W,DW, F
F
X
Source >= 0
0,0,0,0
L
Rad(Source)
(1)
DNRM
F
X
X
0,1,0,0
L
0
W,DW, F
F
X
Source < 0
1,0,0,0
L
Rad(Source)
W,DW, F
W
X
-0.5 <= Rad(Source) < 32767.5
0,0,0,0
L
Rnd(Rad(Source))
W,DW, F
W
X
-0.5 < Rad(Source) < 0.5
0,1,0,0
L
0
W,DW, F
W
X
-32768.5 < Rad(Source) <= -0.5
1,0,0,0
L
Rnd(Rad(Source))
W,DW, F
DW
X
0.5 <= Rad(Source) < 2147483647.5
0,0,0,0
L
Rnd(Rad(Source))
W,DW, F
DW
X
-0.5 < Rad(Source) < 0.5
0,1,0,0
L
0
W,DW, F
DW
X
-2147483648.5 < Rad(Source) <= -0.5
1,0,0,0
L
Rnd(Rad(Source))
(2)
W,DW, F
W
X
Rad(Source) >= 32767.5
0,0,1,0
1
32767
(2)
W,DW, F
W
X
Rad(Source) <= 32767.5
1,0,1,0
1
-32768
(2)
W,DW, F
DW
X
Rad(Source) >= 2147483647.5
0,0,1,0
1
2147483647
(2)
W,DW, F
DW
X
Rad(Source) <= -2147483648.5
1,0,1,0
1
-2147483648
(3)
X
F
X
Source is NAN or INF
0,0,1,0
1
0x7FFFFFFF
(4)
X
W
X
Source is NAN or INF
0,0,1,0
1
32767
(4)
X
DW
X
Source is NAN or INF
0,0,1,0
1
2147483647
(1) All denormalized inputs shall be treated as plus zero. Any underflow result shall produce plus zero.
(2) If the Destination is word or double-word and an overflow occurs(except source is NAN or INF):
If the result is positive, Destination is 32767 for Word and 2147483647 for Double Word. If the result is negative, Destination is -32768 for Word and -2147483648 for
Double Word.
(3) If the Destination is floating point, all overflows (Source is NAN or infinity) shall produce NAN (0x7FFFFFFF).
(4) If Destination is an integer and the Source is NAN or infinity, a saturated result (32767 for Word and 2147483647 for Double Word) shall be stored.
AB
S
Natural Log
S
ource
N7
:
0
0<
Dest
N7
:
1
0<
LN
Execution Time for the LN Instruction
Controller
Data Size
When Rung Is:
True
False
MicroLogix 1400
word
127.3260 µs
0.4094 µs
long word
130.3635 µs
0.4094 µs
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