M800V/M80V Series PLC Programming Manual (1/2)
8 Function Instructions
8.11 Special Function Instructions
-1
ATAND, ATANDP: TAN
Setting
Bit devices
data
X
Y
M
L
F
S
D
[Instruction symbol] [Execution condition]
ATAND
ATANDP
Setting data
Setting data
TAN value for which the TAN
S
the device where TAN value is stored.
D
The first number of the device to store the operation result.
Functions
ATAND
Returns the arctangent angle of the TAN value designated by (S) and stores the operation result in the device number des-
ignated by (D).
S+3
S+2
S+1 S
(
-1
TAN
64-bit floating-point real
number
The angle (operation result) stored at (D) is stored in radian units. For conversion between degrees and radian values, refer
to the RADD and DEGD instructions.
When the operation results in "-0" or an underflow occurs, the operation result is processed as "0".
When setting input values from programming tools, rounding errors may occur.
For precautions when setting input values from programming tools, refer to "6.3.4 Single/Double-Precision Real Number
Data".
IB-1501667-B
operation on floating-point data (double precision)
Usable devices
B SB
T SM V
T
C
○
○
○
○
Command
Command
Meaning
-1
(arctangent) value is obtained or the first number of
D+3
D+2
D+1
)
64-bit floating-point real
number
Word devices
D
R/ZR W SW SD
Z
○
○
○
○
○
○
○
○
○
○
D
376
Digit
Con-
Pointer
designa-
Index
stant
tion
E
P
○
indicates the sign "ATAND".
S
D
P
S
D
Data type
Real number
○