FC6A S
ERIES
MICROS
MART
L
ADDER
P
ROGRAMMING
M
ANUAL
FC9Y-B1726 21-1
21: TRIGONOMETRIC FUNCTION INSTRUCTIONS
Introduction
This chapter describes the trigonometric function instructions that are used to calculate sine, cosine, and tangent from an angle.
RAD (Degree to Radian)
Valid Devices
For the valid device address range, see "Device Addresses" on page 2-1.
When the conversion result is not within the range between –3.402823 × 10
38
and –1.175495 × 10
–38
or between 1.175495 × 10
–38
and
3.402823 × 10
38
, special internal relay M8003 (carry or borrow) is turned on except when the conversion result is 0. When the conversion result is
between –1.175495 × 10
–38
and 1.175495 × 10
–38
, the destination device designated by D1 stores 0.
When the data designated by 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 RAD 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: RAD
S1·S1+1° × π/180 → D1·D1+1 rad
When input is on, the degree value assigned by source device S1 is converted into a radian value
and stored to the destination assigned by device D1.
Device Function I Q M R T C D P Constant Repeat
S1 (Source 1) Degree value to convert into radian — — — — — — X — X —
D1 (Destination 1) Destination to store conversion results — — — — — — X — — —
0
–1.175495
×10
–38
M8003
1 1
1.175495
×10
–38
0–3.402823×10
38
0
Execution Result
1
Overflow
0 1
3.402823
×10
38
Overflow
Not Zero
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 degree value of data registers D10 and D11 assigned by
source device S1 is converted into a radian value and stored to data registers D20 and
D21 assigned by destination device D1.
270° × π/180 → 4.712389 rad
D1S1
270.0
D10·D11
4.712389
D20·D21
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