Figure 11: Input Selector Schematic Diagram - Honeywell ST700 User Manual

Selection Processing
•
If OP_SELECT is non-zero, the OP_SELECT value determines the selected input,
irrespective of the SELECT_TYPE selection. The value of SELECTED is the number
of the input used.
•
If SELECT_TYPE is 'First Good', transfers the value of the first remaining input to
the output of the block. The value of SELECTED is the number of the input used.
•
If SELECT_TYPE is Minimum, it transfers the lowest value to the output of the
block. The value of SELECTED is the number of the input with the lowest value.
•
If SELECT_TYPE is Maximum, it transfers the highest value to the output of the
block. The value of SELECTED is the number of the input with the highest value.
•
If SELECT_TYPE is Middle, if there are 3 or 4 values, the highest and lowest value is
discarded. The average of the remaining two values is computed, and the value is
transferred to the output of the block. The value of SELECTED becomes zero if an
average is used, else the value of SELECTED is the number of the input with the
middle value.
•
If SELECT_TYPE is Average, computes the average of the remaining inputs and
transfers the value to the output of the block. The value of SELECTED is the number
of inputs used in the average.
Page 64 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide

Figure 11: Input Selector schematic diagram

Revision 2.0