2General Physical Characteristics Support for up to 64 nodesNode removal without severing trunk line and under power.Protection from wiring errors. Reverse wiring protection circuitry built into devices.Selectable data rates: 125, 250, 500 K baudNot required to support allData rates trade speed for distancesTrunk line-drop line topologyBranching allowed on dropsAllows zero node separation4
3General Physical Characteristics Twisted pair, low loss, low delay cableUse of sealed or open connectorsSupport of both (opto)isolated and non-isolated devicesSeparate power bus contained in the cableSupport of both network-powered and self-powered devicesHigh current capability (thick and flat cable supports up to 8 amps)Power taps that allow the connection of several power supplies. NOTE: Power Taps are only needed where power supplies are added to network outside of a sealed enclosure. Most power connections are made inside the main control cabinet using ordinary terminal strips.5
4DeviceNet Cable Highliights BareBlueWhiteRedBlack+24VDC ( V+ )CAN-HShieldCAN-L+0VDC ( V- )5 Conductors, 1 pair for 24 Volts DC power, 1 pairfor CAN communication, 1 ShieldMaximum current capability for 24 Volts DC in thickand flat cable is 8 amps. However no more than 4 amps ispermitted in thick cable per NEC Class 2 requirements.( North America Only )Maximum current capability for 24 Volts DC in thin wireis 3 amps.
5Topology P/S Terminator Tap Terminator Trunk Daisy Chain max 20 feet Trunk DistanceTerminatorTapTerminatorTrunkNodeNodeP/SDaisy ChainNodeNodemax20 feetNodeTrunkLengthNodeNodeNodeNodeNodeNodeBranching DropZero DropShort Drops6
6Termination Resistors Termination resistors are 120 or 121 Ohms, 1/4 WattThey MUST be placed at each end of the trunk line between white and blue wires.There are both open and sealed versions
7DeviceNet Physical Media Terms “Trunk” and “Drops” are topology terms.The trunkline is the “backbone” of your network.Drops serve as physical connection mechanisms to the trunkline. Drop length up to 20 feet.There are 3 types of cables: Thick, Flat, and ThinThick & Flat cables are rated for 8 amps of currentThin cable is rated for 3 amps of currentAll types of cable can be used for “Trunk”Discusses the difference of “thick” and “thin” cables vs. “trunk” and “drop” in the context of a bus topology.
8Cable Budgets - Thick Trunk Data Rates Kbaud Kbaud KbaudTrunk Distance m (1640 ft) m (820ft) m (328 ft)Max. Drop Length 20 ft 20 ft 20 ftCumulative Drop 512 ft 256 ft 128 ftNumber of nodes7
9Cable Budgets - Thin Trunk Data Rates Kbaud Kbaud KbaudTrunk Distance m (328 ft) m (328 ft) 100m (328 ft)Max. Drop Length 20 ft 20 ft 20 ftCumulative Drop 512 ft 256 ft 128 ftNumber of nodes
10Cable Budgets - Flat Trunk Data Rates Kbaud Kbaud KbaudTrunk Distance m (1378 ft) m (656 ft) 75m (246 ft)Max. Drop Length 20 ft 20 ft 20 ftCumulative Drop 512 ft 256 ft 128 ftNumber of nodes7
12Sealed T-Taps Tee Tap Field Installable trunk line connectors Keyed left & rightField Installable trunk line connectorsscrew typeTrunk line segmentsmolded minior micro connectorsvarious lengthsDrop linesmini or micro molded connectorsup to 20ftmini, micro or pigtail at sensor16
13Insulation Displacement Connector (IDC) Used for KwikLinkFlat Cable •Requirements–Modular–Low cost–Minimal installation labor–Compact package–Compatible with existing media–NEMA 6P and 13, IP 67 enclosure rating
15Typical Sealed-Style Taps Tee TapsField Installabletrunk lineconnectors-screw type-crimp typeTrunk line segments-molded mini-connectorsDrop lines- moldedconnectors- 0 to 6 m (20 ft.)- mini or microat deviceMultiport Taps28
16Open Style Taps Trunk Dropline Open Open Open Open Style Style Style Zero length drop using 1787-Plug10R with probe cable supportDroplineOpenStyleDeviceOpenStyleDeviceOpenStyleDeviceOpenStyleDeviceSealed Control Enclosure18
17Thick Cable Description Signal pair (#18), blue/whitePower pair (#15), black/redFoil/braid shield with drain wire(#18)PVC/nylon insulation on power pairIndustrial temperature rangeStorage: -40o C to +85oCOperating: -20o C to +60o 8Aderate linearly to 0A at 80o CHigh flexure capabilityFlame resistant, UL Oil Res. II0.480 inch diameter19
18DeviceNet Thick Cable Beldfoil Aluminum/Polyester Shield Vinyl Jacket .480” O.D.Blue & White Data PairDatalene InsulationPolypropylene Fillers18 AWG.Tinned and StrandedCopper Conductors15 AWG.Tinned and StrandedCopper Conductors65% CoverageTinned Copper Braid ShieldStranded Drain WireTinned Copper18 AWG.Thick CableBeldenAB numberGrey PVC3082AYR-29790Yellow CPE3083AYR-39659Red & Black DC Power PairPVC/Nylon Insulation20
19Thin Cable Description Signal pair (#24), blue/whitePower pair (#22), black/redFoil/braid shield with drain wire(#22)PVC/nylon insulation on power pairIndustrial temperature rangeStorage: -40o C to +85oCOperating: -20o C to +70o 1.5Aderate linearly to 0A at 80o CHigh flexure capabilityFlame resistant, UL Oil Res. II0.270 inch diameter21
20DeviceNet Thin Cable Beldfoil Aluminum/Polyester Shield Vinyl or CPE Jacket.270” O.D.Polypropylene FillersBlue & White Data PairDatalene InsulationOverall Mylar Tape24 AWG.Tinned and StrandedCopper Conductors22 AWG.Tinned and StrandedCopper ConductorsStranded Drain WireTinned Copper22 AWG.65% CoverageTinned Copper Braid ShieldRed & Black DC Power PairPVC/Nylon InsulationThin CableBeldenAB numberGrey PVC3084AYR-29832Yellow CPE3085AYR-3966022
23Power Bus Capabilities Single & multiple supply configurationsHigh current capability by using multiple power supplies.Easy to meet supply specifications DNPS by Rockwell Automation is worlds only class 2, DeviceNet certified, 5.25 amp power supply.Power supplies should be dedicated to DeviceNet cable power ONLY!!10
24NETWORK GROUNDINGV- ( Black Wire ) and Shield ( Bare Wire ) MUST be connected to a good earth ground at only one location on a DeviceNet System.Signal.Signal.Shield.V-V+Power Tap..V-V+24 VDC Power Supply
25Single Supply Configuration up to 500 mup to 500 mup to 500 mN32N1powersupplyN33N64Characteristics and AdvantagesPower supplies can be located anywhere on the networkMust consider IR losses along cableGreater current than most comparable networksUp to 8 amps (NEC limits to 4 amps)Power supplies are standard, low cost models13
26Two Supply Configuration ( Current Boost ) up to 500 mN1PowerSupplyN32N33PowerSupplyN64Characteristics and AdvantagesLoads shared by supplies so same low cost supplies are usedSubstantially more currentStill 8 amp limit on any branch of the trunk ( NEC limit of 4 Amps)Supplies can be located anywhere (consider IR losses)14
27Topology for Power Along the Bus OptionalSecondSupply24 VPowerSupply24 VPowerSupplyNodeNodeNodeNodeV+ Power ConductorV- Power ConductorCAN-H, CAN-L, Shield11
28Power Utilization of Devices All devices have a source voltage range of 11 VDC to 25VDC. Some devices will draw more current as the source voltage drops.All devices on a DeviceNet network will draw at least 50 mili-amps of current off of the 24VDC network power. This is because all products, regardless of type, at the minimum will have their tranceiver circuitry powered from the network power.Some devices are designed to draw all of their power off of the network power through the DeviceNet connection entirely. Examples of these type of products include Series 9000 Photoeyes, DeviceLinks and an all input ArmorBlock.Some devices will have their power requirements satisfied by another source of current such as external AC voltage or DC voltage through terminal strips. Examples of these type of products include the DTAMPlus, FlexI/O and the Bulletin 160 drive.The last category of products are those with outputs driving AC loads or higher current DC loads. These products will have tranceivers and electronics powered by the DeviceNet network power, but the output circuitry will be powered off of an external connector or terminal strip. A classic example device is an ArmorBlock with 2 or 4 DC outputs. In this case a 3 pin mini connector is provided to connect in a source of 24 VDC to power the output circuitry ONLY.
29Common Mode VoltageAn easy way to measure for Common Mode Voltage problems is to go the the farthest ends of thenetwork and measure between the Red V+ and Black V- wires. This voltage should NEVER be lessthan 15 Volts.
30Typical System Connections Normal ControlEnclosure+24V0VPowerSupplyV+Scanner PhoenixConnectorCAN-HSHLDCAN-LTrunk LineV-TerminalStripKFD/PCD PhoenixConnectorEarthGround
31Return to DeviceNet Roadmap Click on the underlined text toReturn to DeviceNet Roadmap