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Field Type DCT Initial Access Modify Rec Proc PP
Monitor
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VAL LONG No 0 Yes Yes Yes Yes
OUT OUTLINK Yes 0 No No N/A No
DOL INLINK Yes 0 No No N/A No
OMSL GBLCHOICE Yes 0 Yes Yes No No
EGU STRING Yes Null Yes Yes No No
HOPR LONG Yes 0 Yes Yes No No
LOPR LONG Yes 0 Yes Yes No No
HIHI LONG Yes 0 Yes Yes No Yes
LOLO LONG Yes 0 Yes Yes No Yes
HIGH LONG Yes 0 Yes Yes No Yes
LOW LONG 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 LONG Yes 0 Yes Yes No No
ADEL LONG Yes 0 Yes Yes No No
MDEL LONG Yes 0 Yes Yes No No
LALM LONG No 0 Yes No No No
ALST LONG No 0 Yes No No No
MLST LONG No 0 Yes No No No
SIOL OUTLINK Yes 0 No No N/A No
SIML INLINK Yes 0 No No N/A No
SIMM GBLCHOICE No 0 Yes Yes No No
SIMS GBLCHOICE Yes 0 Yes Yes No No
IVOA GBLCHOICE Yes 0 Yes Yes No No
IVOV LONG Yes 0 Yes Yes No No
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Name Summary Description
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VAL Value This is the desired output value, in engineering units. If
DRVH and DRVL are defined, VAL is forced to be within
the drive limits. VAL is either obtained from DOL or set
via dbPuts.
OUT Output Link This field is used by the device support routines to decide
where to send output. For soft records, it can be a
constant, a database link, or a channel access link. If the
link is a constant, the result is no output.
DOL Desired Output If DOL is a database or channel access link and OMSL is
Location (input CLOSED_LOOP, then VAL is read from DOL. After the
link) check for drive limits VAL will be set to the value
determined by DOL.
OMSL Output Mode Select This field has either the value SUPERVISORY or
CLOSED_LOOP. DOL is used to determine VAL only if
OMSL has the value CLOSED_LOOP. By setting this field
the record can be switched between supervisory and
closed loop mode of operation. While in closed loop
mode, the VAL field cannot be set via dbPuts.
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. If these values are defined,
they must be in the range
DRVL<=LOPR<=HOPR<=DRVH.
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 Hihi Alarm
Severity
HSV High Alarm
Severity
LSV Low Alarm
Severity
LLSV Lolo Alarm
Severity
HYST Alarm Deadband These parameters specify hysteresis factors for triggering
monitor callbacks, i.e. callbacks 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 when last monitors for alarm/archiver/value change
Value were triggered. These fields are used to implement the
hysteresis factors for monitors.
ALST Archive Last Value
MLST Monitor Last Value
SIMM Simulation Mode Simulation mode process variables. Refer to Chapter 3
Section "Simulation Mode" on page 13 for more
information.
SIML Simulation Mode
Location
SIOL Simulation Value
Location
SIMS Simulation Mode
Alarm Severity
IVOA Invalid Alarm Whenever the record is put into INVALID alarm severity
Output Action IVOA specifies an action. See Chapter 3 Section "Invalid
Alarm Output Action" on page 14 for more information.
IVOV Invalid Alarm
Output Value
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This routine next checks to see that device support is available. The routine next checks to see if the device support write routine is defined. If either device support or the device support write routine does not exist, an error message is issued and processing is terminated.
If DOL is a constant, then VAL is initialized to its value and UDF is set to FALSE. If DOL type is a PV_LINK then dbCaAddInlink is called to create a channel access link.
If device support includes init_record, it is called.
upper_alarm_limit = HIHI upper_warning_limit = HIGH lower_warning_limit = LOW lower_alarm_limit = LOLO
-------------------------------------------------------------------------------------- Name Summary Description -------------------------------------------------------------------------------------- PACT Processing Active See Chapter 2 Section "Database Common: Field Descriptions" on page 4 for descriptions. DPVT Device Private NSEV New Alarm Severity NSTA New Alarm Status OUT Output Link This field is used by the device support routines to locate its output. --------------------------------------------------------------------------------------
init()This routine is called once during IOC initialization.
init_record(precord)This routine is optional. If provided, it is called by the record support init_record routine.
get_ioint_info(int cmd,struct dbCommon *precord,IOSCANPVT *ppvt)This routine is called by the ioEventScan system each time the record is added or deleted from an I/O event scan list. cmd has the value (0,1) if the record is being (added to, deleted from) an I/O event list. It must be provided for any device type that can use the ioEvent scanner.
write_longout(precord)This routine must output a new value. It returns the following values:
If the OUT link type is PV_LINK, then dbCaAddInlink is called by init_record.
write_longout calls recGblPutLinkValue to write the current value of VAL. See Chapter 3 Section "Soft Output" on page 13 for details.
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