Spirit flow-x, Справочник по функциям

Страница: 19 / 350

Flow-X─ Function Reference
3-19
Flow-X General functions - fx3CellSelection
fx3CellSelection
Description
The function selects between 3 input cells (typically differential pressure cells) based on the actual
measured value and the failure status of each cell.
The function can handle the following type of cell range configurations:

Lo – Mid – Hi

Lo – Hi – Hi

Hi – Hi – Hi
Where ‘Lo’ means low range, ‘Mid’ mid range and ‘Hi’ high range.
Function
Function inputs Remark EU SW tag Range Default
Name
Cell A value Input value as percentage of span
of cell A
Cell A status Input status of cell A
0: Normal
<> 0 : Failure
Cell B value Input value as percentage of span
of cell B
Cell B status Input status of cell B
0: Normal
<> 0 : Failure
Cell C value Input value as percentage of span
of cell C
Cell C status Input status of cell C
0: Normal
<> 0 : Failure
Range type For a description of the
functionality refer to adjacent
section ‘Logic’
1: Lo Mid Hi
Cell A at low range
Cell B at mid range
Cell C at high range
2: Lo Hi Hi
Cell A at low range
Cell B and C at high range
3: Hi Hi Hi
Cell A, B and C at same
range
RNGTYP
Auto
switchback For a description of the
functionality refer to adjacent
section ‘Logic’
0: Disabled
1: Enabled
Switch-up
percentage Switch-up value expressed as
percentage of span of the lower
range
Does not apply for selection type
‘Hi Hi Hi’ - SWUPPERC 0..100 95
Switch-down
percentage Switch-down value expressed as
percentage of span of the lower
range
Does not apply for selection type
‘Hi Hi Hi’ - SWDNPERC 0..100 90