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Chapter 11
Introduction to DeviceNet
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DeviceNet Purpose
• Open network
• Link low-level devices to PLCs
– Sensors
– Pushbutton stations
– Distributed IO blocks
– Intelli!ent "otor started overloads
– #ariable $re%uenc& drives
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DeviceNet Open Network
• Open network
• Network devices 'nodes( can be purchased
$ro" "an& di$$erent vendors
• Network "ana!ed b& Open DeviceNet
#endors )ssociation 'OD#)(
– OD#)*O+,
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DeviceNet )dvanta!e
• Save wirin! costs
– +ather than run power wires separatel& to each
device – +ather than run si!nal wires $ro" each $ield device
separatel& back to PLC IO "odule connect devices
directl& to a network
– One cable with $our wires• .wo power wires
• .wo si!nal wires
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/ield Devices 0ore Intelli!ent
• .raditional s&ste"s
– ) photo switch countin! pieces as the& pass
on a conve&er was wired directl& into an input"odule*
• Counter pro!ra""ed on ladder to track partscount
• Counter done bit tri!!ered output point tocontrol $ield action
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DeviceNet )dvanta!e
• 0an& DeviceNet devices are intelli!ent*
• Photo switch has counters and ti"ers incorporated
into sensor*• PLC does not need to have ti"er or counter on
ladder*
• 2hen ti"er or counter is done the action is carried
out throu!h +SNet2or3 $or DeviceNet so$tware totri!!er $ield device across the network*
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DeviceNet Co"ponents
• PLC with DeviceNet scanner
• +SNet2or3 so$tware $or DeviceNet
• .runk line• Drop lines
• Nodes
• 0ini"u" one power suppl&
• .wo 141-oh" 5-watt ter"ination resistors• 6p to 78 nodes
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DeviceNet Network 93a"pleCable to open-st&le
connector on
network PLC scanner
:wikLink cable
.er"ination
resistor
+i!htSi!ht
photo sensor
Insulation
displace"ent
connector Co"pact;lock
IO "odule
)r"or;lock
"a3i"u"
8 IO points
Power
suppl&
.er"ination
resistor
Open-st&le connection
$or power suppl&
Pro3 switch
and cable Stack li!ht
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Sa"ple o$ So"e DeviceNet 0edia Co"ponents
.hick round
drop line cable
:wikLink drop
line cable
:wikLink $lat trunk
line cable insulation
displace"ent connector
Device port
.-port
:wikLink $lat trunk
line cable
DeviceLink
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DeviceNet Cablin!
• .hick round
• .hin round
• :wikLink cable
• Special-use cable
• Open-st&le connectors
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.hick +ound Cable
• 6sed $or trunk line
• .-ports used to connect $ro" trunk line to
drop lines
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.hin +ound Cable
• .&picall& used $or drop lines
• Can be used $or trunk in short networks with
low current re%uire"ents
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:wikLink DeviceNet Connection
:wikLink $lat cable
Insulation displace"ent
connector
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Insulation Displace"ent Connection
• /or non-wash down
• .&pical usa!e conve&or lines
• 0ount on inside rail o$conve&or
• No conduit needed
• 9as& installation o$ new
nodes• No "ini"u" spacin!
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DevicePort
• Passive 8- or <-point taps
• Connected to trunk line b& drop line
• Previous slide showed an <-point DevicePort
• Nodes connected to DevicePort b& drop lines
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.-port
• 6sed to connect drop line to trunk line
• Drop line connected to DevicePort and then
on to "ultiple nodes• Drop line connected directl& to node
• 0a3i"u" drop line len!th 4= $eet
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DeviceLink
• )dapter to inter$ace non-DeviceNet devices
to network
• 4- or >-wire 48-# sensors• 0echanical li"it switches
• )n& non-DeviceNet device with rela&
contacts• One re%uired $or each non-DeviceNet node
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)dditional 0edia
• +e$er to the DeviceNet 0edia catalo! $or a
co"plete listin! o$ available products*
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0a3i"u" .runk Line Len!th '1 o$ 4(
• 0a3i"u" cable distance between an& two
nodes
• Not necessaril& actual len!th o$ backbone• 0a3i"u" len!th deter"ined b& cable t&pe
and baud rate
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0a3i"u" .runk Line Len!th '4 o$ 4(
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.runk Line Calculation One
Node nu"ber
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93a"ple One
• Le$t ter"inatin! resistor to node 1 is 14 $eet*
• Drop line node 1 is 4 $eet*
• +i!ht ter"inatin! resistor to node 14 is also14 $eet*
• Node 14 drop line is 4 $eet*
• /ro" node 1 drop line to node 14 drop line is<== $eet*
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.runk Line Calculation '1 o$ 4(
• /or this e3a"ple trunk line len!th is
"a3i"u" len!th o$ cable between
ter"inatin! resistors*
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.runk Line Calculation '4 o$ 4(
• 14 ? <== ? 14 @ <48 $eet
• +e$er to table $or "a3i"u" baud rate o$
network*
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0a3i"u" .runk Line Len!th
.runk line len!th is over <4= $eet so "a3i"u" baud rate $or this network is 14A :*
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.runk Line Calculation .wo
Power Suppl&
1
4
>
8
A
7
B <
1=
11
14
1>
18
7 $t
4 $t
< $t
>== $t4= $t
14 $t
> $t
Node nu"bers
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93a"ple .wo
• Le$t ter"inatin! resistor to node 1 drop line is 4= $eet*• Node 1 drop line is 7 $eet*• +i!ht ter"inatin! resistor to node 14 drop line is 4
$eet*• Node 14 drop line is < $eet*• .runk line $ro" node 14 drop to node 18 drop line is
> $eet*
• Node 18 drop line is 14 $eet*• Node 1 trunk line to node 18 is >== $eet*
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.runk Line Calculation
• /or this e3a"ple trunk line len!th is
"a3i"u" len!th o$ cable between an& two
nodes or ter"inatin! resistors*• )ssu"e round thick trunk line*
• Look at network a!ain*
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.runk Line Calculation .wo '1 o$ 4(
Power Suppl&
1
4
>
8
A
7
B <
1=
11
14
1>
18
7 $t
4 $t
< $t
>== $t4= $t
14 $t
> $t
/or this e3a"ple trunk line len!th is "a3i"u" len!th o$ cable between an&
two nodes or ter"inatin! resistors*
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.runk Line Calculation .wo '4 o$ 4(
• .he lon!est cable distance is between the le$tter"inatin! resistor and node 18*
• /or this e3a"ple the distance betweenter"inatin! resistors would not be the correctcalculation*
• 4= ? >== ? 14 @ >>4 $eet
• +e$er to table $or "a3i"u" baud rate o$network*
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0a3i"u" .runk Line Len!th '1 o$ >(
.runk line len!th is over >4< $eet so "a3i"u" baud rate
$or this network is either14A : or 4A= k*
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0a3i"u" .runk Line Len!th '4 o$ >(
• .he rule is to !o back 4= $eet $ro" the
ter"ination resistors and see i$ there is a
drop line that is lon!er* – I$ a drop is lon!er then it "ust be included in
the trunk line calculation*
– +e"e"ber "a3i"u" drop line len!th is 4=
$eet*
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15
8
43
7
20 feet
0a3i"u" .runk Line Len!th '> o$ >(
• .er"inatin! resistor
and node == is > $eet*
• Node == and node 1 is8 $eet*
• .runk line to node B is
1A $eet*
• 1A $oot drop is lon!erthan > ?8 $or trunk*
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Cu"ulative Drop Line Len!th '1 o$ 4(
• Su" o$ all drop lines
• 0a3i"u" drop line len!th to an& one node
– 4= $eet
• Cu"ulative drop line len!th also deter"ines
network baud rate
Text fgure 11 30
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Cu"ulative Drop Line Len!th '4 o$ 4(
Text fgure 11-30
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.otal )ll Drop Line Len!ths '1 o$ 4(
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.otal )ll Drop Line Len!ths '4 o$ 4(
• Cu"ulative len!th is 1>1 $eet*
• Nodes 1= 1> and 18 e3ceed the 4=-$oot
"a3i"u" drop to an& 1 node*• Shorten up cable*
• Cu"ulative drop line len!th is now 14B $eet*
• +e$er to the table $or "a3i"u" baud rate $ornetwork*
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Cu"ulative Drop Line Len!th
Cu"ulative drop line len!th is 14B $eet*
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Power Calculations
• )dd up total device current
• Deter"ine trunk line len!th
• Cable t&pe• ow "an& power supplies and where "ounted
• Look up tables $or power allowed on network
• /ull calculation "ethod available $or additional
accurac&
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Co""on Proble"s
2ith DeviceNet Networks '1 o$ 4(
• I"proper installation
– .runk line len!th correctE
– Cu"ulative drop line len!th correctE – Power suppl& proper siFeE
– Overdrivin! network with too "uch in$or"ation $lowE
• +e$er to DeviceNet Cable S&ste" Plannin! and
Installation 0anual $ro" +ockwell )uto"ation 2ebsite*
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Co""on Proble"s
2ith DeviceNet Networks '4 o$ 4(
• Network "odi$ication a$ter installation
– .runk line len!th recalculatedE
– Cu"ulative drop line len!th recalculatedE – Power suppl& recalculatedE
– Overdrivin! network with too "uch
in$or"ation $lowE
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DeviceNet Inter$ace
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DeviceNet open-st&le
cable connection point
Set baud rate
Set inter$ace
cards node
Status LEDs
/le3Lo!i3 PLC DeviceNet
Dau!hter Card
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Co"pactLo!i3 DeviceNet Scanner
DeviceNet scanner
Open-st&le cable connection
Co"pactLo!i3 processor
Co"pactLo!i3 is a "e"ber o$ the ControlLo!i3 $a"il&*
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ControlLo!i3 0odular Inter$ace
• ControlLo!i3 "odular
chassis inter$ace
"odule• 1BA7-DN;
• DeviceNet brid!e
"odule
In$or"ation
window
Status L9Ds
Open-st&le
network connection
1BA7-DN;
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93a"ple o$ +ockwell )uto"ation
PLC DeviceNet Inter$ace 0odules• SLC A== DeviceNet scanner
– 1B8B-SDN
• PLC A DeviceNet scanner
– 1BB1-SDN
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93a"ple o$ ,eneral 9lectric PLC
DeviceNet Inter$ace 0odules• Series =->= PLCs
– DeviceNet "aster "odule
– IC7>DN04==• #ersa0a3 PLC
– +e"ote IO DeviceNet network inter$ace
– IC4==D;1==1
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Personal Co"puter
DeviceNet Inter$ace• Co"puter t&pe deter"ines inter$ace needed*
– Notebook uses PC0CI) such as a +ockwell
)uto"ation 1B<8-PCD* – Desktop or industrial co"puter would re%uire
a DeviceNet 1B<8-e3pansion card*
– Co"puter with serial port could use +ockwell
)uto"ation 1BB=-:/D inter$ace bo3*
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1BB=-:/D Inter$aceDesktop or notebook
co"puter with serial port
1BB=-:/D Inter$ace cable
Open-st&le connector to
DeviceNet network
Inter$ace
cable plu!
:/D to serial port
inter$ace cable
SLC A== 1B8B-SDN
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Open-st&le connector
to DeviceNet network
PC0CI) inter$ace
card 1B<8-PCD
SLC A== 1B8B-SDN
Notebook
personal co"puter
Inter$ace cables
1B<8-PCD Card
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6se ControlLo!i3
PLC as a ;rid!e '1 o$ 4(
• 0ost popular inter$ace to PLC $or upload
download on-line editin! is 9thernet
• 9thernet inter$ace card in ControlLo!i3chassis'1BA7- 9N;.(
• ) 1BA7-DN; or DeviceNet brid!e "odule in
ControlLo!i3 chassis to co""unicate withDeviceNet
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6se ControlLo!i3
PLC as a ;rid!e '1 o$ 4(
• 6se +SLin3 9thernet driver to !et to 9thernet
inter$ace "odule
• ;rid!e across ControlLo!i3 backplane toDeviceNet ;rid!e "odule '1BA7-DN;(
• Out DN; to DeviceNet network
• No separate DeviceNet inter$ace re%uired
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+SNet2or3 So$tware
• +SNetwor3 $or DeviceNet so$tware
– Set up network
– 0ap data $lowin! on network – Pro!ra" "onitor or "odi$& device
para"eters
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+SNet2or3 $or DeviceNet
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+SNet2or3 #iew o$ DeviceNet
.er"inationresistor
.er"ination
resistor
Power suppl& not shown in +SNet2or3
.runk line
Drop line
Network scanner
Node address
Device or node
on network
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DeviceNet Scan List
• +SNet2or3 so$tware
• Scan List is part o$ scanner properties*
• )n& device that is on the network that is to bescanned b& the PLC scanner "ust be in the ScanList*
• Network devices are not "apped until placed in theScan List b& pro!ra""er*
– )uto "appin!
– 0anual "appin!
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)dd or re"ovesin!le device to
or $ro" Scan List
)uto "ap
devices when
add to scan list
Scan List tab
Scan List
9lectronic
ke&in!
ControlLo!i3
DN; scanner
properties screen
DeviceNet PLC Scanner Properties
)dd or re"ove
all devices to
or $ro" Scan List
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)vailable Devices on Network
• 2hen !oin! on-line with a network scanner
like a 1BA7-DN; scanner will reco!niFe
devices currentl& present on network* – .hese devices or nodes will be listed in the
)vailable Devices view*
– .hese devices are not in the scan list at this
ti"e*
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)uto 0ap Devices
2hen )dd to Scan List• Do &ou want the device's( to be auto-"apped
when added to the scan listE
• I$ )uto"ap is selected &ou have no control o$how devices are "apped*
• I$ &ou uncheck )uto"ap then devices can be
"anuall& "apped b& the pro!ra""er*
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9lectronic :e&in!
• ow close does a replace"ent device haveto be to the ori!inal when replacedE
– Device t&pe – #endor
– Product code
– 0aGor revision
– 0inor revision• 0inor revision or hi!her
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DeviceNet Data 0appin!
ControlLo!i3
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ControlLo!i3 1BA7-DN; 0appin!
Scanner
properties
Input devices
in Scan List
Input tab
ControlLo!i3 processor
ta!s or addresses
where data is "apped*
Data "appin!$or each node
6nused processor
"e"or&* Can be
"anuall& "apped later*
Click here to
un"ap a device*
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DeviceNet Data 0appin!
• ControlLo!i3 is a >4-bit PLC*
– )ll ta!s will be either >4 bits wide or aH
• 2ord called an inte!er 'IN.( which is17 bits
• ;&te called a short inte!er 'SIN.( which is < bits
• 0ini"u" "e"or& allocation $or an& DeviceNet
device is a SIN.*
• Node 7 is a bulletin 17= )llen-;radle& Drive* – Drive has two words o$ data*
• Drive status in$or"ation as sin!le bits
• Drive speed $eedback represented as = to >4B7B
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>4 ;its
17 ;its
=B<1A17>1
ControlLo!i3 Input 0appin!
Node 7 Drive Input Status word
Node 7 Drives Speed /eedback word Node 8 Series ===
Photo 9lectric Sensor
"appin!
Node > Series ===
Photo 9lectric Sensor
"appin!
ControlLo!i3 .a!s
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ControlLo!i3 Processor
Data 0appin! or .a!s'1 o$ 4(
• Node 7 is ;ulletin 17= the variable $re%uenc&
drive
– Status bits "apped as upper word o$LocalH1HI*Data4J*
– Drive Speed /eedback word is "apped as the
lower word o$ LocalH1HI*Data>J*
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ControlLo!i3 Processor
Data 0appin! or .a!s '4 o$ 4(
• Node 8 is a Series === Photo Switch
"apped as the upper b&te o$ the lower word
at LocalH1*I*Data4J*• Node > is a Series === Photo Switch
"apped as the lower b&te o$ the lower word
at LocalH1*I*Data4J*
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DeviceNet Data 0appin!
SLC A==
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DeviceNet Data 0appin!
• SLC A== and PLC A are 17-bit co"puters*
– )ll data will either be a 17-bit word or one b&te*
•0ini"u" "e"or& allocation $or an& DeviceNetdevice is a b&te*
• Node 7 is a ;ulletin 17= )llen-;radle& Drive*
– Drive has two words o$ data*
• Drive Co""and in$or"ation as sin!le bits• Drive Speed Co""and represented as = to >4B7B
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SLC A== Output Data 0appin!
1B8B-SDN
properties view
Output devices
in Scan List
SLC A== Output Status
.able where data isco"in! $ro"
Output "appin! tab
Click here to un"ap selected device
.wo words or <b&tes currentl&
"apped $or drive
at node 7
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SLC A== Processor Data 0appin!
• Node 7 is ;ulletin 17= the variable $re%uenc&
drive
– Drive Co""and bits word is "apped asOH1*4*
– Drive Speed Co""and word is "apped as
OH1*>*
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Node 4 Output 0appin!
• Node < is a +ockwell )uto"ation 1B4D
co"pact block output "odule*
– .his co"pact block has $our outputs*• Output data $ro" SLC A== "apped to lower
b&te o$ OH1*7*
• Currentl& upper b&te o$ OH1*7 is available $oranother device*
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DeviceNet Nodes
,eneral Properties
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• +i!ht click on device on +SNet2or3 screen*
• ,eneral Properties screen is displa&ed*
– Displa& IO data – Displa& "onitor or "odi$& devices
para"eters
– #iew electronic data sheet '9DS $ile(
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Identi$ies this device
Current node address*
Node address can be
chan!ed here*
Para"eters
tab
Devices
identit&
9DS tab
Nu"bers used
to identi$& 9DS $ile
,eneral Properties
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Device Para"eters
Para"eters
tab
Para"eter
nu"ber
Lock identi$ies
read-onl&
para"eters Click here to
"onitor para"eter
Icons $or uploadin!
or downloadin!to device
0onitor a sin!le
para"eter or all
Current value
o$ para"eter
Device
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Para"eter 9ditin!
Select para"eter
to edit
Options drop-down bo3
Select
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9lectronic Data Sheets
9DS /iles
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9lectronic Data Sheets
• .&picall& re$erred to as 9DS $iles
– 9DS $iles contain in$or"ation re!ardin! the
personalit& o$ the device* – Correct 9DS $ile "ust reside in the device
be$ore it can be a workin! part o$ the network*
– 9DS $ile "ust be the sa"e $ir"ware level as
the device*
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I$ 9DS /ile Is Not Current
• ,o to "anu$acturers 2eb site and download
correct $ile*
• ,o to OD#)*O+, site and download correct$ile*
• 9DS $ile nu"bers represented in e3*
• 6se 9DS 2iFard to update or re!ister thenetwork device*
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9DS 2iFard
6pdatin! a network
Devices 9DS $ile is to
re!ister the $ile*
Click ne3t to continue*
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+e!ister 9DS /ile
ow "an&$iles to re!ister
)$ter download
browse $or $ile
on &ou co"puter*
Click ne3t to
continue
re!istration*
9DS $ile na"e
represented
in e3
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Deter"ine 9DS /ile Na"e
• )$ter downloadin! 9DS $ile the $ile na"e is
represented in e3*
– .o deter"ine 9DS $ile to use when re!isterin!$ileH
• 0ust know e3
• Construct $ile nu"ber $ro" +SNet2or3 !eneral
properties pa!e
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1J @ ===1
Convert ,eneral Properties
Pa!e Device Identit& to e3
7J @ ===7
8>J @ ==4;
1*==8J @ =1==
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Select Correct 9DS /ile
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Select Correct 9DS /ile
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