M800V/M80V Series PLC Programming Manual (1/2)
8 Function Instructions
8.11 Special Function Instructions
SQRD, SQRDP: Square root operation on floating-point data (double precision)
Setting
Bit devices
data
X
Y
M
L
F
S
D
[Instruction symbol] [Execution condition]
SQRD
SQRDP
Setting data
Setting data
Data for which the square root is obtained or the first number of the device where
S
data is stored.
D
The first number of the device to store the operation result.
Functions
SQRD
Returns the square root of the value designated by (S) and stores the operation result in the device number designated by
(D).
S+3
S+2
S+1 S
(
64-bit floating-point real
number
Only positive values can be designated by (S). (Operation cannot be performed with negative numbers.)
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
Usable devices
B SB
T SM V
T
C
○
○
○
○
Command
Command
Meaning
D+3
D+2
D+1
)
64-bit floating-point real
number
Word devices
D
R/ZR W SW SD
Z
○
○
○
○
○
○
○
○
○
○
D
394
Digit
Con-
Pointer
designa-
Index
stant
tion
E
P
○
indicates the sign "SQRD".
S
D
P
S
D
Data type
Real number
○