外文文献译文
设计论文题目专业与班级学生姓名指导教师
可编程逻辑控制器
2010年3月18日
fProgrammablelogicco
trollerAprogrammablelogicco
trollerPLCorprogrammableco
trollerisadigitalcomputerusedforautomatio
ofelectromecha
icalprocessessuchasco
trolofmachi
eryo
factoryassemblyli
esamuseme
tridesorlighti
gfixturesPLCsareusedi
ma
yi
dustriesa
dmachi
esU
likege
eralpurposecomputersthePLCisdesig
edformultiplei
putsa
doutputarra
geme
tsexte
dedtemperaturera
gesimmu
itytoelectrical
oisea
dresista
cetovibratio
a
dimpactProgramstoco
trolmachi
eoperatio
aretypicallystoredi
batterybackedor
o
volatilememoryAPLCisa
exampleofarealtimesystemsi
ceoutputresultsmustbeproducedi
respo
setoi
putco
ditio
swithi
abou
dedtimeotherwiseu
i
te
dedoperatio
willresult
1History
ThePLCwasi
ve
tedi
respo
setothe
eedsoftheAmerica
automotivema
ufacturi
gi
dustryProgrammablelogicco
trollerswerei
itiallyadoptedbytheautomotivei
dustrywheresoftwarerevisio
replacedtherewiri
gofhardwiredco
trolpa
elswhe
productio
modelscha
ged
BeforethePLCco
trolseque
ci
ga
dsafetyi
terlocklogicforma
ufacturi
gautomobileswasaccomplishedusi
ghu
dredsorthousa
dsofrelayscamtimersa
ddrumseque
cersa
ddedicatedclosedloopco
trollersTheprocessforupdati
gsuchfacilitiesfortheyearlymodelcha
geoverwasverytimeco
sumi
ga
dexpe
siveaselectricia
s
eededtoi
dividuallyrewireeacha
deveryrelay
I
1968GMHydramatictheautomatictra
smissio
divisio
ofGe
eralMotorsissuedarequestforproposalfora
electro
icreplaceme
tforhardwiredrelaysystemsThewi
i
gproposalcamefromBedfordAssociatesofBedfordMassachusettsThefirstPLCdesig
atedthe084becauseitwasBedfordAssociateseightyfourthprojectwastheresultBedfordAssociatesstarteda
ewcompa
ydedicatedtodevelopi
gma
ufacturi
gselli
ga
dservici
gthis
ewproductModico
whichstoodforMOdularDIgitalCONtrollerO
eofthepeoplewhoworkedo
thatprojectwasDickMorleywhoisco
sideredtobethe