RKC INSTRUMENT SBR-EW180, User Manual

Page: 163 / 234

9-5
IMSBR10-E1
Operations Related to the Computation Function (/M1 Option)
9
• Status of the Remote Control Input Terminal (D01 to D05, /R1 option)
The status of the remote control input signal (1 or 0) can be used in the computation. Use D01 to D05 (the
number following the letter D is the remote control input terminal number) to specify the status in the equations.
Four Arithmetic Operation
The data that can be used in equations are measured values, computed values, constants, communication input
data, and remote control input terminal status.
Equation Examples
• Addition 01+02
(Determines the sum of the measured values of channel 1 and channel 2.)
• Subtraction 01–02
(Determines the difference of the measured values of channel 1 and channel 2.)
• Multiplication 01*K03
(Multiplies constant K03 to the measured value of channel 1.)
• Division 01/K02
(Divides the measured value of channel 1 by constant K02.)
Note
By setting an equation similar to the one shown below, you can determine the accumulation of a specified
channel (in this case channel 01) and make the result the computed value of computation channel 0A.
Computing equation of computation channel 0A: 0A+01
Power and Other Computations
The data that can be used in equations are measured values, computed values, constants, communication input
data, and remote control input terminal status. You can nest a computing element inside the parentheses of
another computing element.
Equation Examples
• Power 01**02
(Determines the measured value of channel 1 to the power of the measured value of
channel 2.)
• Square root SQR(02)
(Determines the square root of the measured value of channel 2.)
• Absolute value ABS(02)
(Determines the absolute value of the measured value of channel 2.)
• Common logarithm LOG(01)
(Determines the common logarithm (log
10
) of the measured value of channel 1.)
• Exponent EXP(01)
(Determines e to the power of the measured value of channel 1.)
Note
You can determine the natural logarithm by setting an equation like the following.
From log
b
X = log
a
X/log
a
, we obtain log
e
X = log
10
X/log
10
e
Hence, to determine the natural logarithm of channel 1, we set
Constant K01 = 0.43429(log
10
e)
Computing equation and set the equation to LOG(01)/K01.
9.2 Setting the Computing Equation