Page 64 Foundation Fieldbus RMA803 Remote Indicator User's Guide Revision 4
5.7 Input Selector block
The Input Selector block performs maximum, minimum, middle, average and ‘first good’ input
selection. The Input Selector block provides selection of up to eight inputs and generates an output
based on the selected type of input. The block functions as a rotary position switch, or a validated
priority selection based on the use of the first good parameter and the disable_n parameter. As a
switch, the block receives switching information from either the connected inputs or from an
operator input. The block supports signal status propagation.
The block is used to provide control input selection in the forward path only, and hence no back
calculation support is provided. SELECTED indicates which input has been selected or the number
of inputs selected by the algorithm. The block does not support process alarms.
Figure 12: Input Selector block
Execution
Input processing
If DISABLE_n is True, the corresponding input IN_n is discarded. If there are no inputs left, or if
there are inputs fewer than MIN_GOOD inputs, then the value of SELECTED becomes zero.
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