Publication 1766-RM001A-EN-P - October 2008
218
Math Instructions
The Math Overflow Trap Bit shall ONLY be set if the Overflow bit is set.
Otherwise, it remains in last state.
ASN - Arc Sine
Instruction Type: output
Use the ASN instruction to take the arc sine of a number and store the
result (in radians) in the destination. The source must be greater than or
equal to -1 and less than or equal to 1. The resulting value in the
destination is always greater than or equal to -
π
/2 and less than or equal
to
π
/2, where
π
= 3.141592.
Enter the following parameters when programming this instruction:
•
Source is the address to compute the arc sine.
•
Destination is the address to store the arc sine of the Source.
Address Levels for the operands involved in the ASN can be ALL word,
ALL double word, ALL float, or a combination. These operands shall
undergo a conversion to float. The calculation of the source (in float) is
then performed, and the result is then cast to the data type of Destination.
AB
S
Arc
S
ine
S
ource
N7
:
0
0<
Dest
N7
:
1
0<
A
S
N
Execution Time for the ASN Instruction
Controller
Data Size
When Rung Is:
True
False
MicroLogix 1400
word
42.4610 µs
0.3870 µs
long word
43.1010 µs
0.3790 µs
ASN Instruction Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 92.
Parameter
Data Files
Function Files
(1)
CS
-
Comms
IO
S -
I/
O
DL
S
-
D
a
ta
L
o
g
(2
)
Address Mode
(3)
Address Level
O
I
S
B
T,
C
, R
N
F
ST
L
MG,
PD
RI/
R
IX
PL
S
RTC
HS
C
PTOX
, PWMX
STI
EII
BH
I
MMI
LC
D
Di
re
c
t
Indir
e
c
t
Imme
diate
Int16
Im
mediate Int32
Imme
diate
Floa
t
Bi
t
Wo
rd
Do
uble
W
o
rd
Eleme
n
t
Fl
oat
Source
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Destination •
•
•
•
•
•
•
•
•
•
•
•
•
(1) PTOX and PWMX files are only for use with MicroLogix 1400 BXB or BXBA unit.
(2) The Data Log Status file can only be used for the following math instructions: ADD, SUB, MUL, DIV, NEG, and SCP.
(3) See Important note about indirect addressing.
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