ABB 2600T Series Instruction Manual page 100

100 2 6 0 0 T S E R I E S | P R E S S U R E T R A N S M I T T E R S | O I/ 2 6 6/ F F - E N R E V. E
If SELECT_TYPE is Middle, sort the remaining inputs by value. If there are 3 or 4 values, discard the highest and lowest value. If two
values are left, compute their average. Transfer the value to the output of the block. Set SELECTED to zero if an average was used,
else set SELECTED to the number of the input with the middle value.
If SELECT_TYPE is Average compute the average of the remaining inputs and transfer the value to the output of the block. Set
SELECTED to the number of inputs used in the average.
Limit Processing
The computations to determine high and low limit conditions for the output can be complex. They should be done to
the best of the designer's ability. The limits of OUT should be able to tell a PID to stop integrating if the
measurement cannot move.
Equations
With the SELECT_TYPE it is possible select the following algorithms:
Algorythm type
First Good
Minimum
Maximum
Middle
Average
Configuration hints
The minimum configuration for having the IS working and/or moving out from the OOS needs at least the following settings:
• Set the SELECT_TYPE with a valid value. It must be different by 0 and in the range 1 – 5
Description
Select the first available Input with Good Status
Select the minimum value of the Inputs
Select the maximum value of the Inputs
Calculate the middle of three inputs or the average of
the two middle inputs if four inputs are defined
Calculate the average value of the inputs