Plc & Scada

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  • 1. Manda Institute of Technology Raisar, BikanerTOPIC 1. PLC 2. SCADA -Submitted byMahendra Bhakar EC IV Year

2. What is Programmable Logic Controller (PLC) ?? Definition: A PLC is a digital operating electronic apparatus which uses a programmable memory for internal storage of instruction for implementing specific function such as logic, sequencing, timing, counting and arithmetic to control through analog or digital input/output modules various types of machines or process. 3. Historical Background:In 1968, a group of engineers from General Motors developed the concept of PLC with an initial specification. The PLC must be: i . Easy to program. ii. Not need rewiring the control system if change the program. iii. Smaller in size, cheaper and high reliability. iv. simple construction and low maintenancev. Cost- competitive 4. Simple PLC digital inputs networkanalog inputs / outputsdigital outputs 5. Major Components of a Common PLC POWER SUPPLYFrom SENSORSI M N O P D U U T L EPROCESSORPushbuttons, contacts, limit switches, etc.PROGRAMMING DEVICEO U T P U TM O D U L ETo OUTPUT Solenoids, contactors, alarms etc. 6. Leading Brands Of PLC AMERICAN:1. 2. 3. 4. 5. 6. 7.Allen Bradley Gould Modicum Texas Instruments General Electric Westinghouse Cutter Hammer Square DEUROPEAN:1. 2. 3. 4.Siemens Klockner & Mouller Festo Telemechanique 7. Leading Brands Of PLCJAPANESE: 1. 2. 3. 4.Toshiba Omron Fanuc Mitsubishi 8. Areas of Application Manufacturing / Machining Food / Beverage Metals Power Mining Petrochemical / Chemical 9. PLC Size 1. SMALL- it covers units with up to 128 I/Os and memories up to 2 Kbytes. - these PLCs are capable of providing simple to advance levels or machine controls.2. MEDIUM - have up to 2048 I/Os and memories up to 32 Kbytes.3. LARGE- the most sophisticated units of the PLC family. They have up to 8192 I/Os and memories up to 750 Kbytes. - can control individual production processes or entire plant. 10. Tank Used To Mix Two LiquidsMOTORA FSSOLENOIDSFLOAT SWITCHBSOLENOIDC TIMER1 -MINUTE 11. SCADAIntroduction (What Is SCADA?)Supervisory Control And Data Acquisition is an Industrial Control System. To run a Process Control Network (PCN). Monitors and controls industrial plant/ equipment. E.g. water, energy, fuel, telecommunications. Coordinate data transfer between Remote Terminal Units (RTUs) & central host. Display information to operators. 12. SCADA Components Field Instrumentation. Sensors, devices to control. Remote Terminal Units. RTU Vs. PLC Communications Network. Equipment needed to transfer data to and from different sites Central Monitoring Station Collecting information gathered by the remote stations to generate the necessary action 13. A Typical SCADA System13 14. Disadvantages Of Relay Systems Relays used only for on/off control.Complicated control systemsExpensive System.System takes up much floor and space.Control relays are power- hungry, heat generation.Any change in control program requires the rewiring of relays.For complicated control systems, it is difficult to troubleshoot and locate the faults. 15. Advantages Of SCADA systems Easily programmed or reprogrammed Easy maintained (self diagnostic). Capability to do arithmetic function.The ability to communicate with other controller or a master host computer. PLCs. were able to move past simple on/off control to more complex schemes as PID control. 16. Applications Of SCADA Almost every business in the manufacturing sector and many in the service sector Aerospace Bottling and Canning Chemicals Plants Petroleum, Petrochemical 17. Thank you