This document provides an introduction to programmable logic controllers (PLCs) and supervisory control and data acquisition (SCADA) systems. It discusses what PLCs and SCADA are, their importance and how they work. PLCs control industrial automation applications by receiving input signals from sensors and machines, interpreting the data, and sending output signals to control actuators. SCADA systems connect multiple HMI devices to controllers over communication networks to monitor and operate industrial plants and processes from several locations. The document explores the benefits of integrating PLCs and SCADA systems for industrial control applications.

2. TABLEOF CONTENT
• 1
• Copyright © Appin Technology Lab
• •Introduction of PLC
• •Introduction of Scada
• •What is PLC
• •Importance of PLC
• •How PLC works
• •What is Scada
• •Importance of Scada
• •How Scada works
• •Components of SCADA
• •Scada Architectures
• •Why Plc-Scada
• •Benefits Of PLC-Scada
• •Scope of PLC-Scada
• TABLEOF CONTENT

4. INTRODUCTION OF PLC
• Programmablelogiccontrollers(PLCs)havebeenanintegralpartoffactoryauto
mationandindustrialprocesscontrolfordecades.PLCscontrolawidearrayofapp
licationsfromsimplelightingfunctionstoenvironmentalsystemstochemicalpro
cessingplants.Thesesystemsperformmanyfunctions,providingavarietyofanal
oganddigitalinputandoutputinterfaces;signalprocessing;dataconversion;and
variouscommunicationprotocols.AllofthePLC'scomponentsandfunctionsare
centeredaroundthecontroller,whichisprogrammedforaspecifictask.
• ThebasicPLCmodulemustbesufficientlyflexibleandconfigurabletomeetthed
iverseneedsofdifferentfactoriesandapplications.Inputstimuli(eitheranalogor
digital)arereceivedfrommachines,sensors,orprocesseventsintheformofvolta
georcurrent.ThePLCmustaccuratelyinterpretandconvertthestimulusfortheC
PUwhich,inturn,definesasetofinstructionstotheoutputsystemsthatcontrolac
tuatorsonthefactoryfloororinanotherindustrialenvironment

6. • Simatic WinCC Flexible June/2007
• SIEMENS LTD EGYPT 2007
• 4
• s
• Application for HMI
• Controller with one HMI devices
• Controller with several HMI devices
• Control with one HMI device
• An HMI device which is directly connected
• to the controller via the process bus is
• referred to as a single-user system.
• Single-user systems are generally used
• near production, but can also be deployed
• to operate and monitor independent part
• processes or system sections.
• Controller with several HMI devices
• Several HMI devices are connected to
• one or more controllers via a process bus
• (e.g. PROFIBUS or Ethernet).
• Such systems are deployed, for example,
• in a production line to operate the plant
• from several points.

7. • Simatic WinCC Flexible June/2007
• SIEMENS LTD EGYPT 2007
• 5
• s
• Application for HMI
• HMI System with centralized
• functions
• An HMI system is connected to a PC via
• Ethernet. The upstream PC assumes
• central functions, e.g. recipe
• management. The necessary recipe data
• records are provided by the subordinate
• HMI system.