Owner's manual


NAV440UserManual
7430‐0131‐01Rev.F
Page93
Chapter11. BuiltInTest(BIT)
TheBuilt‐InTestcapabilityallowsuserstomonitorhealth,diagnostic,andsystemstatusinformationoftheunitin
real‐tim on
e.Built‐InTestinformati istransmittedineachmeasurementpacket.
NOTE:Adiagnostictestpacket(T0)canberequestedviaGP.Tocontainsacompletesetofstatusforeachhardware
andsoftwaresubsystem.Formoreinformation,refertoChapter10.ProgrammingGuidelines,Test0(Detailed
BITandStatus)Packet
onpage71andGetPacketRequestonpage66.
BITStatusFields
ErrorABITwordconsistsoftwobytes: byteandStatusbyte.
Thefirstbyte(bits0–7)isthe
Errorbyte:signaledresultsfrominternalchecks.Fourintermediatesignalsdetermine
whentoassertmasterFailandthehardwareBITsignal.Thesesignalsarecontrolledbythreecategoriesofsystems
checks:hardware(
hardwareError),communication(comError)andsoftware(softwareError).Instantaneoussoft
failuresfromanycategorytriggersthesignals:aflagisraised.masterFailisnottriggereduntilpersistency
ehasoccu
conditionsaremetorahardfailur rred.
Thesecondbyte(bits8–15)isthe
Statusbyte:signaledstatusalerts.Fourintermediatesignalsdeterminewhento
assertthe
masterStatusflag:hardwareStatus,sensorStatus,comStatus,andsoftwareStatus.masterStatusisthe
logicalORoftheseintermediatesignals.Eachintermediatesignalhasaseparatefieldwithanindicationflag.Each
indicationflagcanbeenabledordisabledbytheuser.Anyenabledindicationflagwilltriggertheassociated
tus
intermediatesignaland
masterSta
TheBITfieldsaresummarizedinTable81
flag.
below. providesadditionalinformationabouttheprogrammable
statusfield.
Table82
Table81DefaultBITStatusValues
BITstatusField Bits Value Config ableur
ErrorBytefields(BIT)
N
masterFail 0 0:no
1:fatalerror
ThemasterFail
rmal
flagisthrownwheneitherahardfailure(fatal
orasoftfailure(persistentproblem)occurs.
condition)
N
hardwareError 1 0:normal
hardwareerror
1:internal
N
comError 2 0:normal
icationerror
1:commun
N
softwareError 3 0:normal
ernalsoftwareerror
1:int
N
Reserved 4:7 N/A N
StatusByteFields
masterStatus 8 0:nominal
1:oneormorestatusalertsoccurred:hardware; com; software;
sensor
Y