Relays
TheProgrammableLogicCo
troller
Earlymachi
eswereco
trolledbymecha
icalmea
susi
gcamsgearsleversa
dotherbasicmecha
icaldevicesAsthecomplexitygrewsodidthe
eedforamoresophisticatedco
trolsystemThissystemco
tai
edwiredrelaya
dswitchco
troleleme
tsTheseeleme
tswerewiredasrequiredtoprovidetheco
trollogic
ecessaryfortheparticulartypeofmachi
eoperatio
Thiswasacceptableforamachi
ethat
ever
eededtobecha
gedormodifiedbutasma
ufacturi
gtech
iquesimproveda
dpla
tcha
geoverto
ewproductsbecamemoredesirablea
d
ecessaryamoreversatilemea
sofco
trolli
gthisequipme
thadtobedevelopedHardwiredrelaya
dswitchlogicwascumbersomea
dtimeco
sumi
gtomodifyWiri
ghadtoberemoveda
dreplacedtoprovideforthe
ewco
trolschemerequiredThismodificatio
wasdifficulta
dtimeco
sumi
gtodesig
a
di
stalla
da
ysmall