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Function Blocks
MMA Min/Max/Avg Function Block
212
HC900 Hybrid Control Designer Function Block Reference Guide
Revision 11
2/07
MMA Min/Max/Avg Function Block
Description
The
MMA
label stands for
Min-Max-Average-Sum.
This block is part of the
Calculations
category.
Function
Accepts inputs from up to six analog input values (X1 - X6) and calculates these values for output:
•
MIN - Minimum input value
•
MAX - Maximum input value
•
AVG - Average of the 6 input values
•
SUM - Sum of the 6 input values
•
DEV - Standard deviation of the 6 input values
•
ALM - Alarm output for deviations
Turns ON ALM when any input is outside the configured number of standard deviations when the
configuration parameter DEV > 0.
•
If DEV configured < 0, then:
−
no standard deviation is calculated;
−
all inputs connected to the block are used to calculate the MIN, MAX, AVG, AND SUM outputs.
•
If DEV configured = 0, then:
−
the standard deviation is calculated for the number of inputs connected to the block, and
−
all inputs connected to the block are used to calculate the MIN, MAX, AVG, and SUM outputs.
•
If DEV configured > 0, then:
−
the standard deviation is calculated for the number of inputs connected to the block, and SDEV =
result;
−
any inputs that deviate more than the configured number (DEV) of standard deviations from the
average are not used to calculate the MIN, MAX, AVG, and SUM outputs;
−
if any input deviates more than the configured number (DEV) of standard deviations, ALM turns ON;
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