Manual

Page 5-27
Chapter 5 Programming
5.6.12 Calculated Point Types
The following menu items are available through the Calculated Point Type menu:
Equation
High Peak
Low Peak
High/Low Difference
Moving Average
Time Average
Gated Timer
Totalize
Calculations may be performed on current point values of a single point or a group of points if set in Equations.
The calculations are performed after each scan of all measured points and the results are stored until the next
point scan.
NOTE: Moving Average can be set on channels A, B, C, D E, and F.
5.6.12.1 Equation
This Point Range of Calculated Point Types allows the user to program an equation to calculate a value of
one or more points and/or constants.
Operators Used for Equations - Forty operators are allowed in any one formula programmed. If the
equation does not compute, the display will read “bad operand”. The following operators are used:
P1 to PF are used to represent Points
K1 to KF are used to represent Constants
) is a RIGHT Parenthesis
+ is Add
- is Subtract
* is Multiply
/ is Divide
^ is Fractional
** is Raise to the Power (X
y
)
Sq is Square Root
Ln is Natural Logarithm
Lg is Base Ten Logarithm
Ex is Exponentiation (e
x
)
( is a LEFT Parenthesis
The Point Setup menu for Equation will be displayed and may require programming the following parameters:
Point Tag Section 5.6.5.1
Decimal fix Section 5.6.5.4
Set Equation Section 5.6.5.18
Engineering Units Section 5.6.5.9
Alarm Setpoint Section 5.6.5.10
Chart Scale Section 5.6.5.11