Publication 1766-RM001A-EN-P - October 2008
220
Math Instructions
ACS - Arc Cosine
Instruction Type: output
Use the ACS instruction to take the arc cosine of a number (source in
radians) 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 0 and
less than or equal to
π
, where
π
= 3.141592.
Enter the following parameters when programming this instruction:
•
Source is the address to compute the arc cosine.
•
Destination is the address to store the arc cosine of the Source.
Address Levels for the operands involved in the ACS 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 Cosine
S
ource
N7
:
0
0<
Dest
N7
:
1
0<
AC
S
Execution Time for the ACS Instruction
Controller
Data Size
When Rung Is:
True
False
MicroLogix 1400
word
18.0150 µs
0.3750 µs
long word
18.3070 µs
0.4150 µs
ACS 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 - C
o
mm
s
IOS - I/O
DLS - Da
ta
Lo
g
(2
)
Address Mode
(3)
Address Level
O
I
S
B
T,
C
, R
N
F
ST
L
MG, PD
RI/RIX
PLS
RTC
HSC
PTO
X
, PW
MX
STI
EII
BH
I
MMI
LCD
Dir
e
c
t
In
dir
ect
Immediate
Int1
6
Immediate Int32
Immed
iate Flo
a
t
Bit
Wo
rd
Do
ub
le
W
o
rd
E
lemen
t
Float
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.
IMPORTANT
You cannot use indirect addressing with: S, MG, PD, RTC, HSC, PTOX,
PWMX, STI, EII, BHI, MMI, CS, IOS, and DLS files.
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