1. PHYSICAL LAYER

2. General Physical Characteristics
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 4

3. General Physical Characteristics
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. 5

4. DeviceNet Cable Highliights
Bare
Blue
White
Red
Black
+24VDC ( V+ )
CAN-H
Shield
CAN-L
+0VDC ( V- )
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.

5. Topology P/S Terminator Tap Terminator Trunk Daisy Chain max 20 feet
Trunk Distance
Terminator
Tap
Terminator
Trunk
Node
Node
P/S
Daisy Chain
Node
Node
max
20 feet
Node
Trunk
Length
Node
Node
Node
Node
Node
Node
Branching Drop
Zero Drop
Short Drops 6

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”
Discusses the difference of “thick” and “thin” cables vs. “trunk” and “drop” in the context of a bus topology.

8. Cable Budgets - Thick Trunk
Data Rates Kbaud Kbaud Kbaud
Trunk Distance m (1640 ft) m (820ft) m (328 ft)
Max. Drop Length 20 ft 20 ft 20 ft
Cumulative Drop 512 ft 256 ft 128 ft
Number of nodes 7

9. Cable Budgets - Thin Trunk
Data Rates Kbaud Kbaud Kbaud
Trunk Distance m (328 ft) m (328 ft) 100m (328 ft)
Max. Drop Length 20 ft 20 ft 20 ft
Cumulative Drop 512 ft 256 ft 128 ft
Number of nodes

10. Cable Budgets - Flat Trunk
Data Rates Kbaud Kbaud Kbaud
Trunk Distance m (1378 ft) m (656 ft) 75m (246 ft)
Max. Drop Length 20 ft 20 ft 20 ft
Cumulative Drop 512 ft 256 ft 128 ft
Number of nodes 7

11. Micro Quick Disconnect
Connectors Supported
Mini Quick Disconnect
18mm
Micro Quick Disconnect
12mm
“Terminal Strip”
Style Connector
Cable 15

12. Sealed T-Taps Tee Tap Field Installable trunk line connectors
Keyed left & right
Field Installable trunk line connectors
screw type
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 16

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
DevicePort Multiport Tap
micro quick disconnects
various configurations
DeviceBox Multiport Tap
cord grip
2, 4, 8 grips
Drop
Trunk
DeviceBox™
(to Trunk)
DevicePort™
Drop
Drop

15. Typical Sealed-Style Taps
Tee Taps
Field Installable
trunk line
connectors
-screw type
-crimp type
Trunk line segments
-molded mini-connectors
Drop lines
- molded
connectors
- 0 to 6 m (20 ft.)
- mini or micro
at device
Multiport Taps 28

16. Open Style Taps Trunk Dropline Open Open Open Open Style Style Style
Zero length drop using 1787-Plug10R with probe cable support
Dropline
Open
Style
Device
Open
Style
Device
Open
Style
Device
Open
Style
Device
Sealed Control Enclosure 18

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: -40o C to +85oC
Operating: -20o C to +60o 8A
derate linearly to 0A at 80o C
High flexure capability
Flame resistant, UL Oil Res. II
0.480 inch diameter 19

18. DeviceNet Thick Cable Beldfoil Aluminum/Polyester Shield Vinyl Jacket
.480” O.D.
Blue & White Data Pair
Datalene Insulation
Polypropylene Fillers
18 AWG.
Tinned and Stranded
Copper Conductors
15 AWG.
Tinned and Stranded
Copper Conductors
65% Coverage
Tinned Copper Braid Shield
Stranded Drain Wire
Tinned Copper
18 AWG.
Thick Cable
Belden
AB number
Grey PVC
3082A
YR-29790
Yellow CPE
3083A
YR-39659
Red & Black DC Power Pair
PVC/Nylon Insulation 20

19. Thin Cable Description
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: -40o C to +85oC
Operating: -20o C to +70o 1.5A
derate linearly to 0A at 80o C
High flexure capability
Flame resistant, UL Oil Res. II
0.270 inch diameter 21

20. DeviceNet Thin Cable Beldfoil Aluminum/Polyester Shield
Vinyl or CPE Jacket
.270” O.D.
Polypropylene Fillers
Blue & White Data Pair
Datalene Insulation
Overall Mylar Tape
24 AWG.
Tinned and Stranded
Copper Conductors
22 AWG.
Tinned and Stranded
Copper Conductors
Stranded Drain Wire
Tinned Copper
22 AWG.
65% Coverage
Tinned Copper Braid Shield
Red & Black DC Power Pair
PVC/Nylon Insulation
Thin Cable
Belden
AB number
Grey PVC
3084A
YR-29832
Yellow CPE
3085A
YR-39660 22

21. KwikLink
4-wire Flat Cable

23. Power Bus Capabilities
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!! 10

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 .
Signal .
Shield . V- V+
Power Tap . . V- V+
24 VDC Power Supply

25. Single Supply Configuration
up to 500 m
up to 500 m
up to 500 m
N32 N1
power
supply
N33
N64
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 13

26. Two Supply Configuration ( Current Boost )
up to 500 m N1
Power
Supply
N32
N33
Power
Supply
N64
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) 14

27. Topology for Power Along the Bus
Optional
Second
Supply
24 V
Power
Supply
24 V
Power
Supply
Node
Node
Node
Node
V+ Power Conductor
V- Power Conductor
CAN-H, CAN-L, Shield 11

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

31. Return to DeviceNet Roadmap
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