YOKOGAWA FVX110, User Manual

Page: 113 / 168

<Appendix 3. Input Selector (IS) Block>
A3-2
IM 01S01C01-01EN
Output Parameters (Computation or Selection Results)
OUT : Block output
SELECTED : Indicates the input number selected using the alternatives.
Other Parameters
OUT_RANGE : Sets the OUT range.
STATUS_OPTS : Option used to specify the handling of various statuses.
SELECT_TYPE : Determines the input selection algorithm.
MIN_GOOD : Parameter specifying the minimum required number of inputs with “good” status. If the
number of inputs that are “good” is less than the value of MIN_GOOD, input selection is
canceled.
Mode
O/S : Allows configuration change, but disables input value output.
Man : Allows internal processing, but the output value may vary depending on the definition of usage conditions.
Auto : Outputs the input value.
The Input Selector (IS) block offers a maximum of eight input alternatives and generates the output according
to the configured action. This block generally receives inputs from the Analog Input (AI) function block. The
function of the IS block is to select a maximum, minimum, middle, average, “first good,” or “latched good”
signal. The block combines parameter configuration (DISABLE_n) and option (“first good”) to give priority to
alternative(s) or to function as a rotary position switch. When used as a rotary position switch, the block can
receive operator inputs or switch information from connected inputs.
The IS block supports the concept of middle selection. This function outputs the average of two middle signals
if even multiple valid signals are configured or a middle signal if odd multiple valid signals are configured.
Application of the block is to supply a selected control signal in the forward path.
The SELECTED parameter is the 2nd output indicating which input has been selected using the algorithm.