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ATAN(P)
Operation Error
(1) In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and
an error code is stored into SD0.
• The contents of the designated device or the result of the addition are not "0", or not within
the following range(For the Universal model QCPU only): (Error code: 4140)
0, 2
-126
| Contents of designated device | < 2
128
• The value of the specified device is 0.
*2
(For the High Performance model QCPU, Process CPU, Redundant CPU)
(Error code: 4100)
*2: There are CPU modules that will not result in an operation error if 0 is specified. Refer to 3.2.4 for details.
• The result exceeds the following range (Operation results in an overflow)
(For the Universal model QCPU only)
2
128
| Operation result | (Error code: 4141)
• The value of the specified device is 0, unnormalized number, nonnumeric, and ± .
(For the Universal model QCPU only) (Error code: 4140)
Program Example
(1) The following program seeks the inverse tangent of the 32-bit floating decimal point real
number at D0 and D1, and outputs the angle to the 4 BCD digits at Y40 to Y4F.
[Ladder Mode]
[List Mode]
[Operations involved when D0 and D1 value is 1]
Calculates an angle (radian value)
by TAN
-1
operation ( )
Converts the radian value
into an angle ( )
Converts the angle in
32-bit floating-point real
number into an integer ( )
Outputs the integer-converted
angle to a display device ( )
1
2
3
4
Step Instruction Device
Conversion to BIN
32-bit floating-point
real number
D21
D20
INT
BCD operation
BCD
ATAN
Conversion to angle
DEG
Y4F
BCD value
0045
Y40
D30
b15 b0
BIN value
45
32-bit floating-point
real number
D1
1
D0
32-bit floating-point
real number
D11
D10
TAN
-1
operation
0
.
785398
45