Omron SYSMAC CS Series, Reference Manual, Page: 725 / 1405

685
Double-precision Floating-point Instructions (CS1-H, CJ1-H, CJ1M, or CS1D Only)
Section 3-16
Description ATAND(856) computes the angle (in radians) for a tangent value expressed as
a double-precision (64-bit) floating-point number in words S to S+3 and places
the result in D to D+3.
(The floating point source data must be in IEEE754 format.)
The result is output to words D to D+3 as an angle (in radians) within the
range of –
π
/2 to
π
/2.
The following diagram shows the relationship between the input data and
result.
Indirect DM/EM
addresses in binary @ D00000 to @ D32767
@ E00000 to @ E32767
@ En_00000 to @ En_32767
(n = 0 to C)
Indirect DM/EM
addresses in BCD *D00000 to *D32767
*E00000 to *E32767
*En_00000 to *En_32767
(n = 0 to C)
Constants ---
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
Area S D
S+1 S )
→
TAN
–1
( S+3 S+2 D+1 D D+3 D+2
R
S: Input data (tangent)
R: Result (radians)