Specifications

SIMATIC Instructions
9-98
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Square Root
The Square Root instruction takes the square root of a
32-bit real number (IN) and produces a 32-bit real
number result (OUT) as shown in the equation:
√ IN = OUT
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
This instruction affects the following Special Memory bits:
SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative).
SM1.1 is used to indicate overflow errors and illegal values. If SM1.1 is set, then
the status of SM1.0 and SM1.2 is not valid and the original input operands are not
altered. If SM1.1 is not set, then the math operation has completed with a valid
result and SM1.0 and SM1.2 contain valid status.
Inputs/Outputs Operands Data Types
IN VD, ID, QD, MD, SMD, SD, LD, AC, Constant, *VD, *AC, *LD REAL
OUT VD, ID, QD, MD, SMD, SD, LD,AC, *VD, *AC, *LD REAL
L
A
D
S
T
L
SQRT IN, OUT
SQRT
EN
IN OUT
ENO
F
B
D
L
A
D
222 224
333
221