Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 102

Processing details
■Square root processing
This function block executes square root extraction with coefficients to the value input from the input variable IN and outputs
the result from the output variable OUT_.
Input (IN)
Input(IN)
Input (IN)
IN  0
IN < 0
IN: Input value, K_: Coefficient
• When the value of the input (IN) is in percentage (%), set the coefficient (K_) to 10. When square root
extraction is executed with K_ = 10 (10IN), 0 to 100% of the input (IN) correspond to 0 to 100% of the
output (OUT_). (For input = 100%, output = 10100 = 100%)
Input(IN)%
100%
• Generally, the output low cut-off value (OLC) is used when the value of the input (IN) is in percentage (%).
(The output low cut-off value (OLC) must be set to around 10 (%) level.)
Operation error
Error code Description
(SD0)
3402H Input data (IN) or operation constant (OLC, K_) is a subnormal number or NaN (not a number).
3403H An overflow has occurred.
6 ARITHMETIC OPERATION
100
6.5 Square Root (with coefficient) (M+P_SQR)
t
Output low cut-off value (OLC)
K_  IN > OLC
K_  IN  OLC

0%
Processi Output (OUT_)
ng

Output(OUT_)
OLC
Output(OUT_)%
100%
10 IN
OLC
t
0%
t
Output (OUT_)
OUT_ = K_  IN
OUT_ = 0
OUT_ = 0
t