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3Systemdescription
Vista SmartTel 21
Control inputs, error relay, sabotage protection
Control inputs
Dependingoncontrolinputfunctionandondeviceconfiguration,events
canbetriggeredbyactiveswitchnormallyopen,activeswitchnormally
closed,edgecontrol,orpermanentcontact.
Inprinciple,controlinputsmustbeswitchedtoground.Usetheground
terminalslabelled onthedevice,orthegroundterminalsofthe
terminalblocklabelled"common ground for all inputs of type control
input"inthetableabove.
Statuschangesatthecontrolinputs-closingandopeningofthecontact-
musthaveadurationofatleast500mstoallowforpositivedetectionby
thedeviceanddistinctionfrom"swishcontacts".
Error relay
Thedeviceconfigurationallowsdesignationofintegratedrelaysaserror
relaysinordertoreportcertainoperatingstatesormalfunctionsusingdry
contacts.Thestatusoftheerrorrelaythenalwayscorrespondstothestatus
oftheErrorLEDonthefrontofSmartTel:
ErrorifLEDon,thenerrorrelayenergised
Noerror,ifErrorLED off,thenerrorrelayde-energised
Examples for
possible errors
reported by
error relay:
FaultyDSP
Faultyvideodecoder
Faultyclockmodule
Memoryerror
Sabotage protection
Theerrorrelayispulledinidle-noerror.Thereforetheerrorrelaycanbeused
assabotagedetector,asitautomaticallyfallsoffintheeventofpowerfailure
(e.g.causedbycutpowerlines).Dependingontheerrorrelaywiring,an
interruptionoftherelaylineitselfcanbereportedaswell.
Thereisatheoreticalpossibilitythatsabotageprotectionwillnotworkif
errorrelayswitchingisnotconsistentwiththeoperatingmode.
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