Agni Ppt Presentation on Plc
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8/3/2019 Agni Ppt Presentation on Plc
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PRESENTED BY Agni Bhattacharjee
AEIE DEPARTMENT 3rd YR.(6th SEM)
ROLL NO. 08119005038SILIGURI INSTITUTE OF TECHNOLOGY
INDUSTRIAL AUTOMATION AND
PROGRAMMEBLE LOGICCONTROLER(PLC)
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OVERVIEW• Industrial Automation• Need & levels of industrial Automation• Control System used in Automation field • Programmable logic Controller(PLC)• How Plc is Different from Common Computers• PLC Hardware Architecture• PLC Operations• Ladder logic Programming & Basics• Types of PLC Programming• AND/OR/NOT GATE LADER Logic Representation• Advantage & Disadvantage of PLC • Applications of PLC • Conclusion• Bibliography
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WHAT IS INDUSTRIAL AUTOMATION?
Automation is the use of control systems and information technologies toreduce the need for human work in the production of goods and services. In
the scope of industrialization . Automation is a step beyond mechanization . Whereas mechanization provided human operators with machinery to assistthem with the muscular requirements of work, automation greatly decreasesthe need for human sensory and mental requirements as well. Automationplays an increasingly important role in the world economy and in daily experience
Levels of Automation:
PLC,DCS
Level 0
Level 1
Level 2
Level 3
Level 4
Sensors, Drivers
Process automation
MES
ERP
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A programmable logic controller (PLC)or programmable controller is a digital computer usedfor automation of electromechanical processes, such ascontrol of machinery on factory assembly lines ,amusement rides, or lighting fixtures.
•
To replace relays and switches as mechanical Relaysand switches failed regularly • Easier to change hardwired logic (example: changingan “OR” circuit • to “XOR”) • Consumed low power• Identification of problems are much easier than relay in PLC
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MANUFACTURERS OF PLC
SIEMENS:
ROCKWELL:
(Hardware platform – S7300, Software platform –
STEP 7, HMI - WinCC)
(Hardware platform – FlexLogix 5434, Softwareplatform – RSLogix 5000,HMI – RSView32)
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A PLC consists of minimum the following components :
• Central Processing Unit (CPU)• Power Supply • Memory • Rail / Rack• Input Modules
• Output Modules
POWER SUPPLY
CPU
MEMORY
ININPUTP
IINPUT
OUTPUTOUTPUT
PROGRAMMING
TERMINAL
PROGRAMMINGTERMINAL
RAIL / RACK
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Steps done in PLC
PLC OPERATION
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Types of Program Time Interrupt Program
Event Interrupt ProgramStartup ProgramCyclic Program
READ INPUTSFROM FIELD
WRITE OUTPUTSTO FIELD
SCAN &EXECUTE
PROGRAM
Cyclic Program Execution
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AND GATE
Ladder logic representation of And gate
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OR GATE
Ladder logic representation of Or gate
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ADVANTAGE OF PLC
Easy Of programming and reprogramming in the plant.High reliability and minimum maintenance.Small physical size.
Moderate to low initial investment costRugged construction.Ability to communicate with computer systems in the plant .
DISADVANTAGES OF PLCToo much work required in connecting wires.Difficulty with changes or replacement.
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APPLICATIONS
• PLCs are used in allmanufacturing
plants or factoriessuch as soft drinkindustry,excitefactories etc.
• Nowdays it is alsoused in trafficcontrol,car parkingetc.
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SIEMENS PLC S7 300
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Conclusion
Thus PLC are vital parts of industrial automation systems.Compared to relays they are low in cost and can wellcommunicate with computer systems in the plant. Above all,the user needs to have complete knowledge of the
programming language in order to work with a PLC.
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Bibliography
Industrial Instrumentation And Control-S K Singh
Process Control Instrumentation Technology-C D Johnson
Study materials from Webel Automation And ConvergenceAcademy, Kolkata.
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Thank you!