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Field Type DCT Initial Access Modify Rec Proc PP
Monitor
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VAL DOUBLE No 0 Yes No Yes No
SELM RECCHOICE Yes 0 Yes Yes No No
SELN USHORT No 0 Yes Yes No No
PREC SHORT Yes 0 Yes Yes No No
NVL INLINK Yes 0 No No N/A No
INPA INLINK Yes 0 No No N/A No
INPB INLINK Yes 0 No No N/A No
INPC INLINK Yes 0 No No N/A No
INPD INLINK Yes 0 No No N/A No
INPE INLINK Yes 0 No No N/A No
INPF INLINK Yes 0 No No N/A No
INPG INLINK Yes 0 No No N/A No
INPH INLINK Yes 0 No No N/A No
INPI INLINK Yes 0 No No N/A No
INPJ INLINK Yes 0 No No N/A No
INPK INLINK Yes 0 No No N/A No
INPL INLINK Yes 0 No No N/A No
A DOUBLE No 0 Yes Yes/No Yes Yes
B DOUBLE No 0 Yes Yes/No Yes Yes
C DOUBLE No 0 Yes Yes/No Yes Yes
D DOUBLE No 0 Yes Yes/No Yes Yes
E DOUBLE No 0 Yes Yes/No Yes Yes
F DOUBLE No 0 Yes Yes/No Yes Yes
G DOUBLE No 0 Yes Yes/No Yes Yes
H DOUBLE No 0 Yes Yes/No Yes Yes
I DOUBLE No 0 Yes Yes/No Yes Yes
J DOUBLE No 0 Yes Yes/No Yes Yes
K DOUBLE No 0 Yes Yes/No Yes Yes
L DOUBLE No 0 Yes Yes/No Yes Yes
LA DOUBLE No 0 Yes No No No
LB DOUBLE No 0 Yes No No No
LC DOUBLE No 0 Yes No No No
LD DOUBLE No 0 Yes No No No
LE DOUBLE No 0 Yes No No No
LF DOUBLE No 0 Yes No No No
LG DOUBLE No 0 Yes No No No
LH DOUBLE No 0 Yes No No No
LI DOUBLE No 0 Yes No No No
LJ DOUBLE No 0 Yes No No No
LK DOUBLE No 0 Yes No No No
LL DOUBLE No 0 Yes No No No
EGU STRING Yes Null Yes Yes No No
HOPR FLOAT Yes 0 Yes Yes No No
LOPR FLOAT Yes 0 Yes Yes No No
HIHI FLOAT Yes 0 Yes Yes No Yes
LOLO FLOAT Yes 0 Yes Yes No Yes
HIGH FLOAT Yes 0 Yes Yes No Yes
LOW FLOAT Yes 0 Yes Yes No Yes
HHSV GBLCHOICE Yes 0 Yes Yes No Yes
LLSV GBLCHOICE Yes 0 Yes Yes No Yes
HSV GBLCHOICE Yes 0 Yes Yes No Yes
LSV GBLCHOICE Yes 0 Yes Yes No Yes
HYST DOUBLE Yes 0 Yes Yes No No
ADEL DOUBLE Yes 0 Yes Yes No No
MDEL DOUBLE Yes 0 Yes Yes No No
LALM DOUBLE No 0 Yes No No No
ALST DOUBLE No 0 Yes No No No
MLST DOUBLE No 0 Yes No No No
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Name Summary Description
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VAL Value Field This field is the computed value, determined as a result of
record processing.
SELM Select Mechanism SELECTED: Use SELN as index (0 to 15)
SELECT_HIGH: Select highest
SELECT_LOW: Select lowest
SELECT_MEDIAN: Select median value.
SELN Select Number Index of selected input. If SELM=SELECTED, then this is
the index (0 to 15) of the input to select.
PREC Display Precision Precision with which to display VAL. This field is used by
record support to supply a value when get_precision
is called.
NVL Index Value IF NVL is a constant, SELN is set to the constant value. If
Location, an input NVL is a database or channel access link then SELN is
link read from NVL.
INPA,...,INPL Input A, Input B, ... The input links. Each may be a constant, a database link,
or a channel access link. Any link not defined is ignored.
NOTE: In order to implement SELM it is necessary to
recognize missing values. The value 1e30 was selected
to represent MISSING. If a link is a constant with value 0
(zero, the default) then at record initialization time the
corresponding A, ... L field is set equal to MISSING.
A,...,L A, B, ... The input values If the corresponding INP field is a
constant, this field is initialized with the constant value
but can be changed via dbPuts.
LA,...,LL Last A, Last B, ... Previous input values These fields are used to decide
when to trigger monitors on A,...,L.
EGU Engineering Units ASCII string describing Engineering units. This field is
used by record support to supply a units description string
when get_units is called.
HOPR High Operating These fields determine the upper and lower display limits
Range for graphics displays and the upper and lower control
limits for control displays. The fields are used by record
support to honor calls to get_graphic_double or
get_control_double.
LOPR Low Operating
Range
HIHI Hihi Alarm Limit These fields specify the alarm limits and severities.
HIGH High Alarm Limit
LOW Low Alarm Limit
LOLO Lolo Alarm Limit
HHSV Severity for a Hihi
Alarm
HSV Severity for a High
Alarm
LSV Severity for a Low
Alarm
LLSV Severity for a Lolo
Alarm
HYST Alarm Deadband These parameters specify hysteresis factors for triggering
monitor callbacks, i.e. monitors specified by calls to
caAddEvent or dbAddEvent. A monitor will not be
triggered until VAL changes by more than the specified
amount.
ADEL Archive Deadband
MDEL Monitor, i.e. value
change, Deadband
LALM Last Alarmed Value These fields are used to implement the hysteresis factors
for monitors.
ALST Archive Last Value
MLST Monitor Last Value
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For each constant input link, the corresponding value field is initialized with the constant value (or 1e30 if the constant has the value 0).
For each input link that is of type PV_LINK, a channel access link is created.
upper_alarm_limit = HIHI upper_warning_limit = HIGH lower_warning_limit = LOW lower_alarm_limit = LOLO
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