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4METHODFORSELECTINGPROGRAMMABLECONTROLLER
fAmethodforformi
ga
applicatio
specificlistofrequiredpropertiesforselecti
gprogrammableco
trollerwasdevelopedThereare
i
ecriterio
sa
dtheresultsareprese
tedi
Table1Selectio
ismadebycompari
gresultstablewithco
troller’stech
icaldataFollowi
gisshortdescriptio
ofeverycriteriai
volved
Natureofsolutio
determi
esweatheritisexpa
di
gofoldsystemorcompletely
ewdevelopme
tI
firstcasethearchitectureofsystema
dhardwarerequireme
tsarelimitedbyalreadyexisti
gsolutio
Usi
ghardwarefromsamecompa
ymakesservici
geasiera
davoidsi
tegratio
problemsthatwouldoccurwhe
usi
gproductsformdiffere
tma
ufacturersForexamplema
yhardwareproducersi
tegratetheirow
specificcommu
icatio
i
terfacesdirectlyi
toprocessormodulea
dforeveryu
iversalprotocolaspecialmoduleis
eededSieme
sAG2003Itisalsopossibletoreducesparepartstockamou
tswhe
usi
gsametypehardwarealloverthesystem
Maximum
umberofelectricali
putsoutputsallowedisclassicalcriteriatodetermi
eprocessorclassIfcomplexco
trolalgorithmsa
d
o
sta
dardfu
ctio
sare
eededit’s
otthemostimporta
tparametera
ymoreGe
erallyitismo
eysavi
gtouseo
ebiggerprocessormodulefori
putoutputsig
alsthatorigi
atefrom
earbylocatio
stha
severalsmallero
esI
thiscasetherewillbe
o
eedforcommu
icatio
etworka
dprogrammi
gwillbeeasiertoo
Specialsig
alsa
dmodulesareusuallyavailableformediuma
dlargeco
trollerfamilieso
lyMa
ymicroco
trollersdo
oteve
havepossibilitytoadda
alogueoutputSieme
sAG2003I
somecasesusi
gspecialmodulesistheo
lywayi
othero
espositio
i
gitisjusta
opportu
itytosavemo
ey
Layoutsofse
sorsa
dactuatorsca
beverydiffere
tsometimesthese
sorsarelocatedseveralkilometresawayfromtheactuatorpumpi
gliquidsi
lo
gpipesI
thiscasespecialcommu
icatio
etworkProfibusASi
tefacemightbetheo
lysolutio
If
otitca
atleastsavecostsbyreduci
gcabli
gworksNotallprogrammableco
trollershavei
terfacesforcommu
icatio
protocols
Propertiesofprocessorhaveimporta
trolei
complexapplicatio
sMostcommo
problemislackofprogrammi
gmemorysometimesalsodatamemoryMemoryrequireme
tsca
beestimatedby
umberofi
puta
doutputsig
alsButi
practice100digitali
putoutputpoi
tssystemofte
has3timessmallerprogramtha
10digitali
putoutputpoi
tssystemTheo
lywaytoestimateprogramsizeexactlyisusi
gpreviousexperie
ce
Programspecialitiesi
cludespecialprogramfu
ctio
s
eededDiffere
tareasofapplicatio
shavesometypicallyusedfu
ctio
sforexampr