User`s guide

Function Blocks
Function Block Categories and Types
76 UMC800 Control Builder User’s Guide Release E
1/01
Block Type Description Graphic Form
MMA Min-Max-Average-Sum - Accepts inputs from up to 6 analog
variables and outputs analog variables representing the
results of a specified operation:
MAX = Maximum analog value
MIN = Minimum analog value
AVG = Average of analog values within a user-specified
number of standard deviations
SUM = Sum of all input values
SDEV = Standard deviation of all analog values
ALM = Alarm output for deviation of any variable outside user
specified standard deviations.
NEG Negate - Accepts a single analog variable input and negates
the output.
RH Relative Humidity - Calculates a relative humidity value
based on a wet bulb, dry bulb, and atmospheric pressure
analog inputs.
DEWP Dewpoint - Monitors Dewpoint or carbon Potential, or to
supply a Dewpoint PV to a PID function Block for Dewpoint
control, based on a Zirconia O
2
probe input.
TOT Totalize - Integrates an Analog variable using a specified
rate. Rate may be in units per minute, hour, or day.
A preset is provided to indicate when a specific quantity has
been accumulated.
Separate enable and reset inputs are provided.
CAVG Continuous Average - Calculates the continuous average
value of the configured input over a configured time period.
When the averaging period elapses, the instantaneous
average will maintain the last calculated average value, the
internal accumulators and sample counters are cleared, and
the time remaining is re-initialized to the full average period.