Delphin ProfiMessage - Page 181

ProfiMessage
WhenconfiguringtheProfibusmaster,itreceivesinformationonthe
numberofI/Ochannelsfromitsslave,andhencealsofromthe
PROFIBUSslave.Atruntime,i.e.whendataexchangeistakingplace,
themastersendstheI/Oconfigurationtotheslave.Iftheconfigured
byteoffsetintheDelphindeviceisgreaterthantheI/Oaddressesof
thetransmittedmasterconfiguration,theDelphindeviceshowsa
configurationerrorinthechannelstatus.
l Bit offset
Thisfieldisavailableonlyforthebitdatatypeandbinaryencoding.Thepay-
loadbitinthisdatatypecanbebetweenthe0andseventhbyteposition.
Byteoffsetisalsoavailableforthisdatatype.Inputisrestrictedtothevalid
values,andthedefaultis0
Data type settings
l Data type
Specifiesthedatatypeforinterpretingthetransmittedpayloaddata.Bit
length, Byte orderandWord orderaresetandadjustedinrelationtothe
adoptedsetting.TheStartpositionindataandScalingaresetaccordingto
datatype.
l Signed
Setswhethertheintegerdatatypeistobeinterpretedassignedor
unsigned.An8-bitvaluewouldthenbeintherange-128to127(two’scom-
plement)or0to255.Floatingvaluesarealwaysinterpretedassigned.Bit-
valuesmakenodistinctionbetweensignedandunsigned.
l Bit length
Setsthebitlengthsforintegerandfloatingdatatypes.Bytesequenceand
Wordsequenceareadjustedaccordingtolengthvalue.Thisalsoappliesto
thenumericfieldsintheStartpositionindata.
l Encoding type
Displaystheencodingtypeusedforinterpretingthetransmittedpayload
data.
l Byte sequence
Thebyteorder(bytesequence)isanumber,madeupofseveralbytes,that
setshowbytesareorderedfortheaddress.BigEndian,alsoknownas
Motorolaformat,ordersthemostsignificantbytetothelowestaddress.
LittleEndian,alsoknownasIntelformat,orderstheleastsignificantbyteto
thelowestaddress.Referalsotohttp://en.wikipedia.org/wiki/Endianness.
l Word order
Likethebyteorder,wordorderordersworddata(1word=2bytes=16
bits)toaddresses.Inadditiontodeterminingbyteorder,adifferentword
orderingmaybenecessary.
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Delphin Technology AG
Dezember 2015
ProfiMessage Manual