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.