Atan (Arc Tangent) - IDEC MICROSmart FC6A Series Ladder Programming Manual

21: T
RIGONOMETRIC

ATAN (Arc Tangent)

ATAN(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 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
W (word) —
I (integer) —
D (double word) —
L (long) —
F (float) X
Example: ATAN
ATAN(F)
SOTU
I1
21-8
F I
UNCTION NSTRUCTIONS
atan S1·S1+1 → D1·D1+1 rad
S1 D1
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.
Function
Arc tangent 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
I Q
— —
— —
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
π
0.3926991 rad = /8 rad
S1
D10·D11 0.4142136
L P
MART ADDER ROGRAMMING
M R T C D P
— — — — X —
— — — — X —
D20·D21
M FC9Y-B1726
ANUAL
Constant Repeat
X —
— —
D1
0.3926991