Fisher FIELDVUE DVC6200f Instruction Manual page 148

Detailed Setup—ISEL Function Block
July 2013
D The Input Selector block Target mode is Auto, OP_SELECT [22] is not being used, and SELECT_TYPE [19] is 0. In this
case, the BLOCK_ERR [6] parameter shows a Block Configuration Error.
The Input Selector block Actual mode will be Manual if all of the above is not true and the Target mode is Manual.
Figure 4‐13. Input Selector Function Block Schematic
IN_1
IN_2
IN_3
IN_4
DISABLE_1
DISABLE_2
DISABLE_3
DISABLE_4
OP_SELECT
SELECT_TYPE
NOTE: THIS FIGURE DOES NOT INCLUDE THE ADDITIONAL
4 INPUTS IN THE EXTENDED PARAMETERS.
Status Handling
Quality Use and Propagation
In Auto mode, OUT [7] reflects the value and status of the selected input based on the following criteria:
D A bad or disabled input is never used by any of the selection algorithms
D For a selection algorithm to use an input with status of Uncertain, the STATUS_OPTS [10] parameter must have
"Use Uncertain as Good."
D STATUS_OPTS [10] is applied before selection.
D If the number of good inputs is less than MIN_GOOD [20], or if the number of inputs evaluated is 0, the status of
OUT [7] and SELECTED [21] will be Bad.
D If an input is disabled or its status is Bad and is selected via OP_SELECT [22], then the status of OUT [7] and
SELECTED [21] will be Bad. If the quality of the input is Uncertain, and the selection for the STATUS_OPTS [10]
parameter is "Use Uncertain as Good," then the status of OUT [7] and SELECTED [21] will be Uncertain. Otherwise
the status of OUT [7] and SELECTED [21] will be Good Noncascade.
146
Selection
Algorithm
AUTO
MAN
SEL_TYPE
MIN_GOOD
Instruction Manual
D103412X012
OUT
SELECTED