Diapositive 1

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17 Juin 2005, Réunion STRQdS, PARIS, NeCST

• Networked Control Systems Tolerant to faults
• FP6-IST-STREP Project
• E. Rondeau
• CRAN-UMR 7039 CNRS-UHP-INPL

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17 Juin 2005, Réunion STRQdS, PARIS, NeCST

• PLAN
• 1. NeCST project
• 2. WP5 Communication
• 3. NeCST Platforms
• 4. Conclusion

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1. NeCST project

• NeCST Networked Control Systems Tolerant to
  Faults
• STREP Project
• IST - Embedded Systems
• Contract n IST 2004 004303
• Start date of project 1 August 2004
• Duration 3 years
• Budget 2M (Total) 1.2 M (Eligible costs)

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1. NeCST project

• ? Project Coordinator E. Rondeau
• ? Contractors
• University Henri-Poincaré, Nancy 1 (UHP, France)
  (Leader D. Sauter)
• Helsinki University of Technology (HUT, Finland)
  (Leader SL Jämsä-Jounela)
• University of Duisburg-Essen (UNIDE, Germany)
  (Leader S. Ding)
• University of Hull (UHULL, UK) (Leader R.
  Patton)
• NESTE JACOBS Oy (NESTE, Finland) (Leader M.
  Sourander)
• PREDICT (PREDICT, France) (Leader J.B. Léger)
• SAE Automation (SAE, Slovakia) (Leader V.
  Palacka)

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17 Juin 2005, Réunion STRQdS, PARIS, NeCST
1. NeCST project
- The aim of the project is to explore research
opportunities in the direction of distributed
control systems in order to enhance the
performance of diagnostics and fault tolerant
control systems. - Conventional Fault Detection
and Isolation (FDI) / Fault Tolerant Control
(FTC) and Autonomy theories, with their ideal
assumptions such as synchronised control, non
delayed sensing and actuation, must be adapted to
the new paradigm of NeCS.
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1. NeCST project
? FDI/FTC Conceptual Model
Evaluation
Fault Detection
Accommodation
Application Model
Reconfiguration
Application
Degradation
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1. NeCST project
? FDI/FTC Conceptual Model For Distributed
Systems
Delay
Failure
Evaluation
Fault Detection
Accommodation
Remote Application Model
Reconfiguration
Remote Application
Degradation
Remote measures and Remote compensations generate
- Missing values - Delays, Jitters - Clock non
synchronization
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1. NeCST project
? FDI/FTC Conceptual Model OVER NETWORK
Network
Evaluation
Fault Detection
Accommodation
Remote Application Model
Reconfiguration
Remote Application
Degradation

• Network generates
• - Management traffic (ARP, STP, SNMP,)
• - Route optimization (RIP,)
• Protocols with self adaptation mechanisms (TCP)
• Correlation between delay missing messages
  (TCP)
• Encapsulation fragmentation of messages,

Remote measures and Remote compensations generate
- Missing values - Delays, Jitters - Clock non
synchronization

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1. NeCST project
? FDI/FTC Conceptual Model OF NETWORK
Evaluation
Fault Detection
Accommodation
Network Model
Reconfiguration
Network
Degradation

• Compensation on the network
• - Accommodation Priority, Queuing policy, load
  balancing
• - Reconfiguration protocols, network
  architecture
• Degradation Message Inter arrival, traffic
  smoothing,

Network Measure - Network instrumentation Networ
k Model - Queuing model, Network calculus
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17 Juin 2005, Réunion STRQdS, PARIS, NeCST
1. NeCST project
? NeCST Conceptual Model
Evaluation
Fault Detection
QoS
Network Model
Accommodation
Network
Reconfiguration
Remote Application Model
Degradation
Remote Application
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Goal To coordinate the Local and Global FDI/FTC
models in taking into account the network QoS
1. NeCST project
? NeCST Conceptual Model and EMBEDDED SYSTEMS
Evaluation
Fault Detection
Network Model
Accommodation
Network
Reconfiguration
Remote Application Model
Degradation
Remote Application
Network Devices
Embedded Components
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1. NeCST project
WP3 FDI/FTC in a distributed framework (UNIDE)
WP2 User Requirements (HUT)
WP4 Autonomous operating conditions (UHULL)
WP5 Communication design and management (UHP)
WP8 Application to an industrial petroleum oil
refinery (NESTE)
WP7 Communication design tool (SAE)
WP6 Distributed software design (PREDICT)
WP10 Exploitation strategies and dissemination
(PREDICT)
WP9 Project assessment (UHP)
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2. WP5 Description Objectives
17 Juin 2005, Réunion STRQdS, PARIS, NeCST

• ? Design of robust communication architectures
• high quality of service in terms of temporal
  performances and availability, with respect to
  the needs of the distributed application
• ? Define procedures and algorithms
• detect and accommodate network failures

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2. WP5 Description Network information (FDI)
? Measured - State of the connections at an
equipment (broken link at a router, ) -
Transmission time (from an equipment to
another) - Queue length in a buffer

• ? Computed
• Upper bound transmission delay (obtained from
  Network calculus)
• ? Configuration parameters
• Network architecture
• Message parameters management (priority, queuing
  policy, protocols

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2. WP5 Description Network FDI Instrumentation
Information to measure Connectivity Delay Queues
size Jitter Clock non synchronisation
MIB/ SNMP
2. Obtain local information
3. Distribution of the knowledge
1. Test the connectivity
Technologies Active / Passive measurements
(analyser) Management Protocol like SNMP Clock
synchronisation (IEEE1588)
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2. WP5 Description Network FDI Network state
computation

• ? Principle
• Detect abnormal deviations of some network
  characteristics from their nominal values
• The network state D is determined by the mean of
  the network calculus theory

packets length
data rate
output capacity
burst level
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2. WP5 Description Network FDI Residual
generation
QoS required by applications
Abnormal delay measured value
Upper bond computed value



DELAYS


Measured delays value
Frames number
Traffic modification effect is adapted on line
Upper bond estimated Value variation
QoS required by applications
DELAYS





Frames number
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2. WP5 Description Network FDI

• ? Fault Classification
• Negligible QoS is not significantly degraded
• Tolerable The fault effect can be
  compensated.Modification of message priority in
  the device.
• Significant Node Failures

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2. WP5 Description Fault Tolerant Network

• ? Objective
• Compensate effects of the faults on the system
  performances

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2. WP5 Description Fault Tolerant Network

• ? Network reconfiguration procedure

Distribute industrial devices on different
Ethernet switches in order to reduce the load of
the switches
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2. WP5 Description Embedded FDI/FTC

• ? Compensate local network fault to avoid traffic
  congestion
• ? Adapt the communication traffic in order to
  ensure a good QoS

in a switch network device
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3. FDI/FTC over Network Platforms
NeCST SIMULATION PLATFORM
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3. FDI/FTC over Network Platforms
NeCST SIMULATION PLATFORM
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3. FDI/FTC over Network Platforms
NeCST SIMULATION PLATFORM
WP4 Autonomy
WP5 Network
WP8 PROSimulator
WP7 OPCDB Gateway
WP3 FDI / FTC
WP6 CASIP
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3. FDI/FTC over Network Platforms
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3. FDI/FTC over Network Platforms
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3. FDI/FTC over Network Platforms
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3. FDI/FTC over network Platforms
NeCST EXPERIMENTAL PLATFORM
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4. Conclusion

• First period was validated by EC
• Second Period Integration and Evaluation of
  all WPs in the platforms
• NeCST Web Site www.strep-necst.org
• 1st Workshop on NCS FTC (6-7 Octobre 2005,
  Ajaccio)