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Programming Function Blocks and Features
4.12 Program Calculated Values
A Calculated Value (CV) is a data point whose value is derived from calculations involving other data
points. The CV Output can be analog or discrete. A CV can include other CVs in its calculations. Once a
CV is created, it can be used by any function block as many times as desired.
Select "CALCULATED VALUES" on the Main Program Menu. Select a CV to program, then choose
from the types shown in
4-16
Table
.
ATTENTION
If you plan to program another function block using a Calculated Value as a parameter, you must program
the Calculated Value first.
Once you change the type and press Enter, the previous type's settings are deleted and cannot be
recovered.
If your unit has the "standard math" package, you still have access to "advanced math" package types but
the fields will be blank and unaccessible.
Type
NONE
PEAK PICKING
SIGNAL SELECT
COMPARE
COUNTER
MATH
FREE FORM MATH
LOGIC
FREE FORM LOGIC
INVERTER
BCD
FUNCTION
GENERATOR
INTERVAL TIMER
PERIODIC TIMER
MASS FLOW
CARBON
POTENTIAL
RELATIVE
HUMIDITY
STERILIZATION
ADV SPLITTER
STD SPLITTER
SCALING
SIGNAL CLAMP
1 PT BLOCK AVG
ROLLING AVG
MULTIPLE AVG
CEM BLOCK AVG
CEM ROLLING AVG
S: Standard Math package
A: Advanced Math package
Refer to the page shown for the desired CV programming procedures. Press Enter when the "PRESS
ENTER TO SAVE" prompt appears to save your entries made during the session.
106
Table 4-16 CV Types
Math
Description
Package
No CV Programmed
A
Picks maximum input value
A
Selects signal per your criteria
A
Compares input and outputs result
A
Counts transitions of input status
S
Calculates math on 8 inputs using one operator
S
Calculates math on 8 inputs using several operators
S
Outputs logic of inputs
S
Outputs logic of inputs using custom equation
S
Inverts status of input
S
Binary Coded Decimal conversion
A
Generates custom y = f(x) curve
A
Counts time in minutes
S
Generates periodic pulse
A
Calculates mass flow with square root
A
Generates a %C value
A
Calculates relative humidity
A
Calculates F
A
Splits input into 3 outputs
A
Splits input into 2 outputs
A
Scales input to output
A
Clamps input to specified values
A
Averages one input
A
Computes rolling average of one input
A
Averages multiple inputs
A
Averages one input over specified intervals
A
Computes rolling average of one input over specified intervals
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