Acos (Arc Cosine) - IDEC MICROSmart FC6A Series Ladder Programming Manual

ACOS (Arc Cosine)

ACOS(F)
*****
Valid Devices
Device
S1 (Source 1)
D1 (Destination 1)
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
W (word) —
I (integer) —
D (double word) —
L (long) —
F (float) X
Example: ACOS
ACOS(F)
SOTU
I1
acos S1·S1+1 → D1·D1+1 rad
S1 D1
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:
If the S1·S1+1 value is not within this range, 0 is stored to D1·D1+1.
Function
Arc cosine value to convert into radian
Destination to store conversion results
Since floating point data is used, the source and destination devices use two consecutive data registers.
S1 D1
D10 D20
FC6A S MICROS
ERIES MART
21: T
-1.0 ≤ S1·S1+1 ≤ 1.0
I Q
— —
— —
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.
acos –0.7071068 → 2.356194 rad
π
2.356194 rad = 3 /4 rad
S1
S1
–0.7071068
D10·D11
–0.7071068
D10·D11
L P M
ADDER ROGRAMMING
F
RIGONOMETRIC UNCTION
M R T C D P
— — — — X —
— — — — X —
D1
D1
D20·D21
D20·D21
FC9Y-B1726
ANUAL
I
NSTRUCTIONS
Constant Repeat
X —
— —
2.356194
2.356194
21-7