AN INTRODUCTION TO SUPERVISORY CONTROL AND
DATA ACQUISITIONFundamentals and Implementation
SUBMITTED BY:RISHABH
SRIVASTAVA100105027
ELECTRONICS AND
INSTRUMENTATION.
“Supervisory control and data acquisition, or SCADA, is the
control technology that enables the operator of a controlled industrial process or plant to
obtain data from one or more of its distant facilities and send limited
control instructions to those facilities”
DEFINITION OF SCADA
Four basic components of SCADA:
• Sensors
• Remote telemetry units (RTUs).
• SCADA master units.
• The communications network
BASIC COMPONENTS OF SCADA.
• BLOCK DIAGRAM FOR BASIC SCADA SYSTEM.
A SCADA system performs four functions:
• 1. Data acquisition
• 2. Networked data communication
• 3. Data presentation
• 4. Control
• 5. Human Machine Interface.(HMI)
BASIC FUNCTIONS OF SCADA.
• What is HMI?
• Role of HMI.
• What Does HMI Comprise?
HUMAN-MACHINE
INTERFACE (HMI)
COMPARISIONBETWEEN
DCS AND SCADA.
FEATURES DCS SCADA
DATA TRANSMISSON
ONE WAY TRANSMISSON
TWO WAY TRANSMISSON
CONTROL FULL ELABOTAED, GENERALLY FULL CONTROL
LIMITED OR SIMPLE CONTROL
INTERVENTION LIMITED INTERVENTION
FREQUENT AND IMMEDIATE INTERVENTIONS
DIFFERENT USES OF SCADA SYSTEMS:
Mass transit: regulate electricity to subways, trams and trolley buses; to automate traffic signals for rail systems; to track and locate trains and buses; and to control railroad crossing gates.
Manufacturing: manage parts inventories for just-in-time manufacturing, regulate industrial automation and robots, and monitor process and quality control.
DIFFERENT USES OF SCADA SYSTEMS(CONTD.):
Electric power generation, transmission and distribution: Electric utilities detect current flow and line voltage, to monitor the operation of circuit breakers, and to take sections of the power grid online or offline.
Buildings, facilities and environments: Facility managers use SCADA to control HVAC, refrigeration units, lighting and entry systems.