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PHYSICAL LAYER. Support for up to 64 nodes Node removal without severing trunk line and under power. Protection from wiring errors. Reverse wiring protection.

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Presentation on theme: "PHYSICAL LAYER. Support for up to 64 nodes Node removal without severing trunk line and under power. Protection from wiring errors. Reverse wiring protection."— Presentation transcript:

1 PHYSICAL LAYER

2 Support for up to 64 nodes Node 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 baud –Not required to support all –Data rates trade speed for distances Trunk line-drop line topology –Branching allowed on drops Allows zero node separation General Physical Characteristics

3 Twisted pair, low loss, low delay cable Use of sealed or open connectors Support of both (opto)isolated and non-isolated devices Separate power bus contained in the cable –Support of both network-powered and self-powered devices High 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. General Physical Characteristics

4 DeviceNet Cable Highliights 5 Conductors, 1 pair for 24 Volts DC power, 1 pair for CAN communication, 1 Shield Maximum current capability for 24 Volts DC in thick and flat cable is 8 amps. However no more than 4 amps is permitted in thick cable per NEC Class 2 requirements. ( North America Only ) Maximum current capability for 24 Volts DC in thin wire is 3 amps. +24VDC ( V+ ) +0VDC ( V- ) CAN-H CAN-L Shield Bare Blue White Red Black

5 Zero DropShort Drops Branching Drop Topology Terminator Tap Trunk Daisy Chain max 20 feet Node Trunk Distance Trunk Length P/S

6 Termination Resistors Termination resistors are 120 or 121 Ohms, 1/4 Watt They MUST be placed at each end of the trunk line between white and blue wires. There are both open and sealed versions

7 DeviceNet 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 Thin –Thick & Flat cables are rated for 8 amps of current –Thin cable is rated for 3 amps of current –All types of cable can be used for Trunk

8 Cable Budgets - Thick Trunk Data Rates 125 Kbaud 250 Kbaud 500 Kbaud Trunk Distance 500m (1640 ft) 250m (820ft) 100m (328 ft) Max. Drop Length 20 ft 20 ft 20 ft Cumulative Drop512 ft256 ft128 ft Number of nodes

9 Cable Budgets - Thin Trunk Data Rates 125 Kbaud 250 Kbaud 500 Kbaud Trunk Distance 100m (328 ft) 100m (328 ft) 100m (328 ft) Max. Drop Length 20 ft 20 ft 20 ft Cumulative Drop512 ft256 ft128 ft Number of nodes

10 Cable Budgets - Flat Trunk Data Rates 125 Kbaud 250 Kbaud 500 Kbaud Trunk Distance 420m (1378 ft) 200m (656 ft) 75m (246 ft) Max. Drop Length 20 ft 20 ft 20 ft Cumulative Drop512 ft256 ft128 ft Number of nodes

11 Mini Quick Disconnect 18mm Micro Quick Disconnect 12mm Terminal Strip Style Connector Cable Connectors Supported

12 Tee Tap –Keyed left & right Trunk line segments –molded minior micro connectors –various lengths Drop lines –mini or micro molded connectors –up to 20ft –mini, micro or pigtail at sensor Field Installable trunk line connectors –screw type Sealed T-Taps

13 Insulation 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

14 Multi-Port Sealed Media Drop Trunk DeviceBox DevicePort Drop (to Trunk) Drop DevicePort Multiport Tap –micro quick disconnects –various configurations DeviceBox Multiport Tap –cord grip –2, 4, 8 grips

15 Typical Sealed-Style Taps Multiport Taps Tee Taps Trunk line segments - molded mini-connectors Drop lines - molded connectors - 0 to 6 m (20 ft.) - mini or micro at device Field Installable trunk line connectors -screw type -crimp type

16 Trunk Dropline Open Style Taps Zero length drop using 1787-Plug10R with probe cable support Sealed Control Enclosure Open Style Device Open Style Device Open Style Device Open Style Device

17 Thick Cable Description Signal pair (#18), blue/white Power pair (#15), black/red Foil/braid shield with drain wire(#18) PVC/nylon insulation on power pair Industrial temperature range –Storage: -40 o C to +85 o C –Operating: -20 o C to +60 o 8A derate linearly to 0A at 80 o C High flexure capability Flame resistant, UL Oil Res. II inch diameter

18 DeviceNet Thick Cable Vinyl Jacket.480 O.D. Beldfoil Aluminum/Polyester Shield Polypropylene Fillers Blue & White Data Pair Datalene Insulation 18 AWG. Tinned and Stranded Copper Conductors 15 AWG. Tinned and Stranded Copper Conductors Red & Black DC Power Pair PVC/Nylon Insulation Stranded Drain Wire Tinned Copper 18 AWG. 65% Coverage Tinned Copper Braid Shield Thick CableBeldenAB number Grey PVC3082AYR Yellow CPE3083AYR-39659

19 Signal pair (#24), blue/white Power pair (#22), black/red Foil/braid shield with drain wire(#22) PVC/nylon insulation on power pair Industrial temperature range –Storage: -40 o C to +85 o C –Operating: -20 o C to +70 o 1.5A derate linearly to 0A at 80 o C High flexure capability Flame resistant, UL Oil Res. II inch diameter Thin Cable Description

20 DeviceNet Thin Cable Vinyl or CPE Jacket.270 O.D. Beldfoil Aluminum/Polyester Shield Polypropylene Fillers Blue & White Data Pair Datalene Insulation 24 AWG. Tinned and Stranded Copper Conductors 22 AWG. Tinned and Stranded Copper Conductors Red & Black DC Power Pair PVC/Nylon Insulation Stranded Drain Wire Tinned Copper 22 AWG. 65% Coverage Tinned Copper Braid Shield Overall Mylar Tape Thin CableBeldenAB number Grey PVC3084AYR Yellow CPE3085AYR-39660

21 KwikLink 4-wire Flat Cable

22

23 Single & multiple supply configurations High 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!! Power Bus Capabilities

24 NETWORK GROUNDING V- ( Black Wire ) and Shield ( Bare Wire ) MUST be connected to a good earth ground at only one location on a DeviceNet System. Signal Shield V- V+ V-V+ 24 VDC Power Supply..... Power Tap

25 power supply N33N64N32N1 up to 500 m Single Supply Configuration Characteristics and Advantages –Power supplies can be located anywhere on the network Must consider IR losses along cable –Greater current than most comparable networks Up to 8 amps (NEC limits to 4 amps) –Power supplies are standard, low cost models

26 Two Supply Configuration ( Current Boost ) Power Supply N33N64N32N1 up to 500 m Power Supply Characteristics and Advantages –Loads shared by supplies so same low cost supplies are used –Substantially more current Still 8 amp limit on any branch of the trunk ( NEC limit of 4 Amps) –Supplies can be located anywhere (consider IR losses)

27 V+ Power Conductor V- Power Conductor 24 V Power Supply Optional Second Supply Topology for Power Along the Bus Node 24 V Power Supply Node CAN-H, CAN-L, Shield

28 Power 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.

29 Common Mode Voltage An easy way to measure for Common Mode Voltage problems is to go the the farthest ends of the network and measure between the Red V+ and Black V- wires. This voltage should NEVER be less than 15 Volts.

30 Typical System Connections V+ V- SHLD CAN-H CAN-L Terminal Strip +24V 0V Power Supply Earth Ground Normal Control Enclosure Trunk Line Scanner Phoenix Connector KFD/PCD Phoenix Connector

31 Return to DeviceNet Roadmap Return to DeviceNet Roadmap Click on the underlined text to


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