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Distributed Control
System
What is DCS?
• Centralised
• Decentralised
Centralized
• Single Master - Slave(s)
system
• All Stations depend on single
central controller to sent and
receive information
• No direct contact between
stations
Centralized
• Disadvantages :
• Reliability .
• Wiring and installation costs.
• The complexity is high for a
system handling very large
number of variables
simultaneously.
Decentralized
• Hierarchical Control
Distribution
• Central Controller >Local
Controller > Stations
• Different Local Controllers
might not be connected
together
• Also known as Layered or
Hierarchical system
Decentralized
• Advantages :
• Lower implementation and
upgrading cost
• More reliable, flexible
• Less complex
• Lower cost of interfacing
Distributed Control System
• Customizable Decentralized System
• Hierarchy of Controllers are connected by
Communication channels
• Generally designed with redundancy to handle
safety-critical processes
DCS vs PLC vs SCADA
• More Expensive
• Control Continues
Process
• Critical Applications
• Process Oriented
• Maintains Constant
Stream of Data for
control
• High Speed Machine
Control
• Data Gathering
Oriented
• Maintains speed by
Storing values and
data for use during
outrages
Direct Digital Control
Digital Control => Use of Computers
Direct Digital Control - A digital computer generates
control signals which directly operate the control
devices
Supervisory Control - A digital computer generates
control signals used as reference values for
conventional analog controllers
Distributed Process Control
Distributed Process Control System
i) Central Control Station
ii) Controlling portions
• Central Control Station
- Human Machine Interface
Display, Storage, I/O Devices, Control s/w
• Controlling Area
- Measurement of analog & digital signals
- Generation of output to actuators
• Communication: By individual channels or
shared data highways
Centralized decentralized discrete control systems

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Centralized decentralized discrete control systems

  • 1.
  • 3. What is DCS? • Centralised • Decentralised
  • 4. Centralized • Single Master - Slave(s) system • All Stations depend on single central controller to sent and receive information • No direct contact between stations
  • 5. Centralized • Disadvantages : • Reliability . • Wiring and installation costs. • The complexity is high for a system handling very large number of variables simultaneously.
  • 6. Decentralized • Hierarchical Control Distribution • Central Controller >Local Controller > Stations • Different Local Controllers might not be connected together • Also known as Layered or Hierarchical system
  • 7. Decentralized • Advantages : • Lower implementation and upgrading cost • More reliable, flexible • Less complex • Lower cost of interfacing
  • 8. Distributed Control System • Customizable Decentralized System • Hierarchy of Controllers are connected by Communication channels • Generally designed with redundancy to handle safety-critical processes
  • 9.
  • 10. DCS vs PLC vs SCADA • More Expensive • Control Continues Process • Critical Applications • Process Oriented • Maintains Constant Stream of Data for control • High Speed Machine Control • Data Gathering Oriented • Maintains speed by Storing values and data for use during outrages
  • 11. Direct Digital Control Digital Control => Use of Computers Direct Digital Control - A digital computer generates control signals which directly operate the control devices Supervisory Control - A digital computer generates control signals used as reference values for conventional analog controllers
  • 12. Distributed Process Control Distributed Process Control System i) Central Control Station ii) Controlling portions
  • 13. • Central Control Station - Human Machine Interface Display, Storage, I/O Devices, Control s/w • Controlling Area - Measurement of analog & digital signals - Generation of output to actuators • Communication: By individual channels or shared data highways