21: T
RIGONOMETRIC
F
UNCTION
I
NSTRUCTIONS
21-8 FC6A S
ERIES
MICROS
MART
L
ADDER
P
ROGRAMMING
M
ANUAL
FC9Y-B1726
ATAN (Arc Tangent)
Valid Devices
For valid device address ranges, see "Device Addresses" on page 2-1.
When the data designated by source device S1 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 ATAN 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: ATAN
atan S1·S1+1 → D1·D1+1 rad
When input is on, the arc tangent of the value assigned by source device S1 is stored in radians
to the destination assigned by device D1.
Device Function I Q M R T C D P Constant Repeat
S1 (Source 1) Arc tangent 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 tangent 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.
atan 0.4142136 → 0.3926991 rad
0.3926991 rad = π/8 rad
D1S1
0.4142136
D10·D11
0.3926991
D20·D21
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