502
Floating-point Math Instructions Section 3-14
3-14-15 ARC COSINE: ACOS(464)
Purpose Calculates the arc cosine of a 32-bit floating-point number and places the
result in the specified result words. (The arc cosine function is the inverse of
the cosine function; it returns the angle that produces a given cosine value
between –1 and 1.)
Ladder Symbol
Variations
Applicable Program Areas
Operand Specifications
Description ACOS(464) computes the angle (in radians) for a cosine value expressed as a
32-bit floating-point number in S+1 and S and places the result in R+1 and R.
(The floating point source data must be in IEEE754 format.)
ACOS(464)
S
R
S: First source word
R: First result word
Variations Executed Each Cycle for ON Condition ACOS(464)
Executed Once for Upward Differentiation @ACOS(464)
Executed Once for Downward Differentiation Not supported.
Immediate Refreshing Specification Not supported.
Block program areas Step program areas Subroutines Interrupt tasks
OK OK OK OK
Area S R
CIO Area CIO 0 to CIO 6142
Work Area W0 to W510
Holding Bit Area H0 to H510
Auxiliary Bit Area A0 to A958 A448 to A958
Timer Area T0000 to T4094
Counter Area C0000 to C4094
DM Area D0 to D32766
Indirect DM addresses
in binary
@ D0 to @ D32767
Indirect DM addresses
in BCD
*D0 to *D32767
Constants #00000000 to #FFFFFFFF
(binary)
---
Data Registers ---
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
R+1 R
S
S+1COS
–1
Source (32-bit floating-point data)
Result (32-bit floating-point data)
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