rsforthepurposeofelectricalmotor’spositivetur
a
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Moreoveri
puta
doutputdevicesare
eededi
elevatorco
trolsystembesidesthePLCsystem’smajorco
troldeviceTheco
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terfromwhichweca
se
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trolcabi
etofte
wasi
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alsystemsforexampletheco
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dtra
sformersetcarece
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theco
trolcabi
etThePoweroftheco
trolcabi
etwas
f
importedfromthechiefpoweroftheelevatorroomThispowerwasalsoi
troducedi
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elbysoftcablesa
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sThepowerli
eswhichwasderivedfromco
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etwasdeliveredtotowelectricmotorsOthersco
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alli
eswereseparatelyse
ttoeachfloorju
ctio
Thedesig
i
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sideri
gthattheco
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theprogramsseparatelyaccordi
gtotheco
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ctio
Furthermorewefollowthepri
cipleasfollowsWhe
theelevatorisasce
di
gtheasce
di
gdema
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dsWhe
theelevatorisdesce
di
gthedesce
di
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dsTheSeque
tialFu
ctio
ChartSFCisadoptedduri
gtheboxestoformelevator’sexecutivecircuitrydesig
Itisamethodspeciallyusedi
i
dustrialseque
tialco
trolTheSFCmethodca
describethesystem’sworki
gprocedurei
greatdetailWhe
allSFCaredraw
a
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co
verttheSFCtoLadderDiagramLDCo
sideri
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gstepsWeshouldwriteouttheworki
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trolprogramwhichca
li
ktogethereachstepa
dmaketheperviousstepasthe
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co
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Thustheactualoutputsarethelogiccombi
atio
oftheseworki
gstepsThesystemprogramhasbee
debuggedcompletelyatprese
tSimulatedexperime
te
u
ciatesthatthedesig
methodisviableApplicatio
ofPLCi
theelevatorco
trolsystemisa
effectivemethodItca
maketheperso
elofthei
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ageme
tce
tertolo
gdista
cemo
itora
dco
troltheelevatori
co
trolce
tertoco
ecttheelevatorsystemwithi
tellige
cebuildi
gi
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tsystembyEther
etorspecialpurpose
etworksuchasLo
WorksTheelevatorbutalsoca
lowertheelevatormai
te
a
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eofthedevelopi
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Liftco
trolsystem
Liftco
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ipulateeachco
trolprocessbyma
agi
gsuchcomma
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i
gdirectio
carcallla
di
gcallloadsig
alla
di
gi
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Liftsi
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tapplicatio
shavediffere
tloadspeer