wirelesshart, an overview - docbox.etsi.org · wirelesshart - self organizing, self healing...
TRANSCRIPT
WirelessHART, an overviewBy Jean-Luc Griessmann, HCF Europe, Basel, Switzerland
What is HART ?
More than 24 million devices with HART installed since 1989
� Two Simultaneous Communication Channels– 4-20mA channel – fast, robust & reliable– Digital two-way communication channel
- Device status - Diagnostics - Alerts, and more!Continuously monitoring both channels
improves system performance
HART System Integration
• Cost-effective interface solutions support integration into plant control systems� New control systems have direct HART-
enabled I/O
� Third party products support integration with
HMIHMIEngineeringEngineering
MaintenanceMaintenance
legacy systems
• Multiplexers - Some integral with Field Termination Assemblies
• Gateways - HART to Ethernet, HART to Modbus, HART to Profibus, more…
• Single Loop Monitors - convert digital process variables and diagnostic alerts to 4-20mA signals and contact closures
• WirelessHART
I/OI/O
ControlControl
Worldwide Installed BaseField Devices - Press, Temp, Flow, Level, Valve Positioners, Analytical
11%
34% ~ 58 Million Devices at Y.E. 2007
3%
11%
41%HART Fieldbus Proprietary 4-20mA + Pneumatic
Smart Non - SmartSource - ARC Advisory Group, Dedham, MA
Wireless + HART = WirelessHART™Wireless + HART = WirelessHART™
WirelessHART - Self Organizing, Self Healing Interoperable Wireless Mesh Network
• Simple - Same wireless capabilities for all field devices
• Reliable - Messages routed around interference and obstacles
• Secure - AES-128 bit Encryption, Join Keys, Session Keys, MICsAccess
WirelessHARTField Devices
Host Application(e.g., Asset Management)
Join Keys, Session Keys, MICs• Flexible - User chooses topology,
speed, application• Built on Standards - IEEE802.15.4
2.4GHz - Frequency hopping• Same HART User Experience – Same
tools and practices as wired HART• Same HART - Compatible with HART-
enabled control systems and EDDL• Backward Compatible
AccessPoint
AccessPoint
GatewayWireless Handheld
Network Manager
SecurityManager
WirelessAdapter
HART-enabledField Devices
Process AutomationController
Mesh Networks
• Network Manager� Maintains, updates routes� Establishes links between devices� Allocates bandwidth
• Every device is a ROUTER• Result: path diversity
� Redundant Communication Paths AccessPoint Wireless
WirelessHARTField Devices
Host Application(e.g., Asset Management)
� Redundant Communication Paths� More Devices = More Reliability� Messages route around obstacles and
interference sources
• Network Diagnostics� All devices build and maintain a list of
neighbors� All devices report neighbor list and
network health
• Very Flexible, Easy to Expand
AccessPoint
PointGateway
WirelessHandheld
Network Manager
Security Manager
WirelessAdapter
HART-enabledField Devices
Process AutomationController
Network Design
• One Network Manager
• Multiple Gateways
(Only one per wireless network)
• Multiple Access Points per Gateway
(for Redundancy and Throughput)
AccessPoint
GatewayWirelessHandheld
WirelessHARTField Devices
Host Application(e.g., Asset Management)
(for Redundancy and Throughput)
• Devices Per Access Point =Average Update Rate (Sec) X 30
1Sec AUR X 30 = 30 Devices
60Sec AUR X 30 = 1800 Devices if faster update/more devices
then add an Access Point!
AccessPoint
Network Manager
SecurityManager
WirelessAdapter
HART-enabledField Devices
Process AutomationController
• An intelligent device (2 devices in one)� On the wireless side it appears
like a slave device
� On the wired side it appears like a master
New Wireless ConnectivityWhat is an adapter? What’s it do?
Device 1
Device 2Poll addr. 63
like a master
• The Adapter is responsible for acquiring the data from the sub-device.
• The Adapter must publish data on behalf of the connected Field Devices
• The Adapter must work in multi-drop mode
─ Multivariable process data,─ Diagnostics─ Device status, and─ Configuration data
New Wireless Devices
• Target application areas• Asset management• Environmental monitoring• Energy management
• Regulatory compliance• Remote or inaccessible equipment• Temporary test installations
• The HART technology and standards are established, managed and supported by the HART Communication Foundation (HCF)
• HCF is an international organization with global membership of more than 230 companies serving the
The Standard
membership of more than 230 companies serving the process automation industry
• HART technology established in IEC Standards� IEC 61804 EDDL – in cooperation with FF & PNO
� IEC 61158 Application Layer & Services - Type 20
� IEC 61784-1 Communication Profile – CPF 9/1
� IEC/PAS 62591 WirelessHART Communication Network andProfile- to be included in 61158
Market Outlook for Wireless Devices
Total Shipments of Wireless Devices for Process Man ufacturers Sensors/Analyzers - Total Market CAGR = 82.0%
Source ARC Advisory Group
