Transcript DeviceNet Overview

Evolution of NeSSI
End User
Value
Gen III
Circa 200?
Gen II
Circa 2005
Micro Analytical
(enabled by Technology Advances)
At the Pipe
(enabled by Intrinsic Safety)
Smart Devices
(enabled by Communication Standard)
We are Here
Gen I
Now
Rick Ales 4/21/2003
Miniature/Modular
(enabled by Mechanical Standard)
© Swagelok Company, 2002
Intrinsically Safe Network Dilemma
Existing IS Networks:
– ControlNet
– Foundation Fieldbus
– Profibus PA
– HART
These Networks are:
– Too big,
– Too complicated
– Too expensive!
Rick Ales 4/21/2003
© Swagelok Company, 2002
Why DeviceNet?
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Up to 64 Nodes.
500 m @ 125Kb, 100 m @ 500Kb.
8 byte network length, fragmentation application.
Linear trunk / drop line.
Power & signal on same cable. 24Vdc @ 8A
Peer to Peer or Master/Slave.
Remove & replace under power.
Hazardous area classification is Class 1 Div 2
Open standard administered by ODVA.
SMALL, SIMPLE & CHEAP!!
– 5-10 times cheaper than other industrial networks.
Rick Ales 4/21/2003
© Swagelok Company, 2002
Why Not DeviceNet?
• Not rated Class 1 Div 1
• A factory automation protocol.
Rick Ales 4/21/2003
© Swagelok Company, 2002
NeSSI Sensor Bus Choices
Make a Class 1 Div 1 network (ie. Foundation
Fieldbus, Profibus PA, Hart, or ControlNet)
small and cheap or …
Use Class 1 Div 2 DeviceNet in an enclosure
rated for hazardous environments or …
Make DeviceNet Class 1 Div 1
Rick Ales 4/21/2003
© Swagelok Company, 2002
DeviceNet Overview
• DeviceNet is an open industrial networks built
upon the Common Industrial Protocol (CIP).
– DeviceNet is managed by ODVA.
– ControlNet is managed by ControlNet International
– EtherNet/IP jointly managed by ControlNet International & ODVA
User &
Application
Layers
Transport,
Data Link &
Physical Layers
Rick Ales 4/21/2003
Common Industrial Protocol
Device Profiles & Electronic Data Sheets
Application Object Library
Messaging Routing & Connection Management
DeviceNet
ControlNet
EtherNet/IP
Device Level
Control Level
Information Level
© Swagelok Company, 2002
Intrinsically Safe DeviceNet
• Class 1 Zone 0 rating of EEx ia IIC T4
• DeviceNet Master and the single network power
source is located in Class 1 Zone 2 area.
• Main trunk line maximum distance 100 ft.
• Maximum power consumption per node is 0.25W
• Maximum 10 nodes per trunk line.
Technically feasible!!
Rick Ales 4/21/2003
© Swagelok Company, 2002
NeSSI DeviceNet Structure
Common Device Profiles
User
Layer
Automotive
Device Profiles
Semiconductor
Device Profiles
Analytical Inst.
Device Profiles
Generic
Device Profiles
Application Object Library
CIP
Application
Layer
Data Link &
Transport
Layer
Physical
Layer
Messaging Routing & Connection Management
Device Net
(CAN Bus)
DeviceNet
Physical Layer
Div 2Div 2Div 1
Device Level
Rick Ales 4/21/2003
ControlNet
DLL
Transport
Encapsulation
UDP
TCP
Future
IP
ControlNet
Physical Layer
802.x EtherNet
Physical Layer
Control Level
Information Level
Future
Firewire, USB
Bluetooth, ATM
© Swagelok Company, 2002
Open DeviceNet Vendor
Association
ODVA is an international association
comprised of members from the world's
leading automation companies.
Rick Ales 4/21/2003
© Swagelok Company, 2002
ODVA’s Role
• Owns and manages the DeviceNet Specification.
• Manages the development of CIP network
technologies.
• Assists manufacturers and users of CIP networks
through tools, training and marketing activities.
• Manages testing labs to verify conformance of
vendors' products to the DeviceNet Specifications.
Rick Ales 4/21/2003
© Swagelok Company, 2002
ODVA Member Functions
Board Of Directors
Technical Review Board (TRB)
CIP Common Protocol System Architecture SIG
CIP Common Marketing SIG
Physical Layer
SIG
Conformance
SIG
Analytical
Instrumentation SIG
Enabler
SIG (future)
Semiconductor SIG
System
SIG
Automotive SIG
CIP Common Device Profile SIGs
System
JSIG
Enabler
JSIG
Physical Layer
JSIG
Conformance
JSIG
©2001 Open DeviceNet Vendor Association
Rick Ales 4/21/2003
© Swagelok Company, 2002
ODVA Staff
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Executive Director
Staff Technologist
Conformance Test Service Providers
Member and Customer Service
Operations Management
Rick Ales 4/21/2003
© Swagelok Company, 2002
DeviceNet IS Initiative
• Extend the user layer definitions to include
analytical instrumentation device definitions and
additional EDS formats.
• Extend the conformance testing to include support
for analytical applications.
• Extend the physical layer definition to include the
intrinsically safe option.
• Obtain agency approval of DeviceNet IS.
Rick Ales 4/21/2003
© Swagelok Company, 2002
Resource Requirements
• Quorum of Analytical Instrumentation vendors to form
a DeviceNet SIG and create device profiles &
conformance tests. ($5K/yr ODVA dues.)
– Analytical Instrument SIG might be supplemented by a
User’s Advisory Board. (Associate membership)
• Engineering resource for physical layer development.
• Technical resource to obtain agency approval.
Development, testing and approval project costs:
$500K to $750K.
Rick Ales 4/21/2003
© Swagelok Company, 2002
What’s Next?
• Reassess the need for intrinsically safe network.
• Convene a group of Key NeSSI stake holders to
meet with ODVA directors to create a DeviceNet
IS initiative project plan and identify resources
and funding sources.
• ODVA goal: announce the DeviceNet IS initiative
at ISA 2003.
Rick Ales 4/21/2003
© Swagelok Company, 2002