PLC SCADA Training

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PLC SCADA Training

• In Hands On Robotics

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PLC

• A PROGRAMMABLE LOGIC CONTROLLER (PLC) is an
  industrial computer control system that
  continuously monitors the state of input devices
  and makes decisions based upon a custom program
  to control the state of output devices.

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PLC Process
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SCADA

• Supervisory control and data acquisition (SCADA)
  is a control system architecture that uses
  computers, networked data communications and
  graphical user interfaces for high-level process
  supervisory management, but uses other peripheral
  devices such as programmable logic controllers
  and discrete PID controllers to interface to the
  process plant or machinery.

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• The operator interfaces which enable monitoring
  and the issuing of process commands, such as
  controller set point changes, are handled through
  the SCADA supervisory computer system.
• However, the real-time control logic or
  controller calculations are performed by
  networked modules which connect to the field
  sensors and actuators.

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• The SCADA concept was developed as a universal
  means of remote access to a variety of local
  control modules, which could be from different
  manufacturers allowing access through standard
  automation protocols.
• In practice, large SCADA systems have grown to
  become very similar to distributed control
  systems in function, but using multiple means of
  interfacing with the plant.

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• They can control large-scale processes that can
  include multiple sites, and work over large
  distances.
• It is one of the most commonly-used types of
  industrial control systems, however there are
  concerns about SCADA systems being vulnerable to
  cyberwarfare/cyberterrorism attacks.

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SCADA Concepts

• The key attribute of a SCADA system is its
  ability to perform a supervisory operation over a
  variety of other proprietary devices.
• The accompanying diagram is a general model which
  shows functional manufacturing levels using
  computerised control.
• Level 0,1,2,3,4.

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• Level 0 contains the field devices such as flow
  and temperature sensors, and final control
  elements, such as control valves.
• Level 1 contains the industrialised input/output
  (I/O) modules, and their associated distributed
  electronic processors.
• Level 2 contains the supervisory computers, which
  collate information from processor nodes on the
  system, and provide the operator control screens.
• Level 3 is the production control level, which
  does not directly control the process, but is
  concerned with monitoring production and targets.
• Level 4 is the production scheduling level.

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