FC6A S
ERIES
MICROS
MART
L
ADDER
P
ROGRAMMING
M
ANUAL
FC9Y-B1726 21-7
21: T
RIGONOMETRIC
F
UNCTION
I
NSTRUCTIONS
ACOS (Arc Cosine)
Valid Devices
For valid device address ranges, see "Device Addresses" on page 2-1.
When the data designated by source device S1 is not within the range between –1.0 and 1.0 or does not comply with the normal floating-point
format, a user program execution error will result, turning on special internal relay M8004 and ERR LED on the FC6A Series MICROSmart. For details
about the user program execution errors, see "User Program Execution Errors" on page 3-10.
Since the ACOS instruction is executed in each scan while input is on, a pulse input from a SOTU or SOTD instruction should be used.
Valid Data Types
Example: ACOS
acos S1·S1+1 → D1·D1+1 rad
When input is on, the arc cosine of the value assigned by source device S1 is stored in radians to
the destination assigned by device D1.
The S1·S1+1 value must be within the following range:
-1.0 ≤ S1·S1+1 ≤ 1.0
If the S1·S1+1 value is not within this range, 0 is stored to D1·D1+1.
Device Function I Q M R T C D P Constant Repeat
S1 (Source 1) Arc cosine value to convert into radian — — — — — — X — X —
D1 (Destination 1) Destination to store conversion results — — — — — — X — — —
W (word) — Since floating point data is used, the source and destination devices use two consecutive data registers.
I (integer) —
D (double word) —
L (long) —
F (float) X
When input I1 is turned on, the arc cosine of the value of data registers D10 and D11
assigned by source device S1 is stored to data registers D20 and D21 assigned by
destination device D1.
D1S1
–0.7071068
D10·D11
2.356194
D20·D21
acos –0.7071068 → 2.356194 rad
2.356194 rad = 3
Ï€
/4 rad
D1S1
–0.7071068
D10·D11
2.356194
D20·D21
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