What are basic components of plc and scada? The architecture of plc and scada

PLC : 1. It is a solid state device. It controls the output of the process through the program given in Ladder diagrams.2.I/p & O/p are represented in NO,NC and coil contacts. 3.Each component involved are defined using Address. SCADA:1. It is a software. Used to monitor,control and acquire data from field devices even from remote locations.2. I/p & O/p are represnted in images.3. Each object is defined using name.    Since every industry is getting automated,it is important to know PLC and SCADA and its functions.

PLC: Programmable Logic Controller , it is a Industrial Computer (It is a hardware)that performs discrete or sequential logic in a company environment.

It was originally developed to replace mechanical relays, timers, counters.

PLC are used successfully to execute complicated control operations in a plant.

It is a controlling device that controls output process through logic programs given to it.

Examples of some important brand PLCs are; Allen Bradely, Siemens, Omron etc

Applications of PLC:

1. Reliability in operation
2. Flexibility in control
3. Online/Offline modifications
4. Speed in operation
5. Security

SCADA: Supervisory Control and Data Acquisition :

It is a monitoring and controlling software, runs on PC and is generally connected to varies PLCs and other peripheral devices.

Examples of SCADA Software used in industries are; R.S View, Wonderware, Win CC.