programmable logical controller (plc) presented by:- mrs. bindu thakral and jaidev singh
DESCRIPTION
PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh . Index. Introduction PLC Basics PLC and Controls History Advantages of PLCs PLC Operation Comparison to Relay Logic Applications Conclusion. Introduction. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/1.jpg)
PROGRAMMABLE LOGICAL CONTROLLER
(PLC)
PRESENTED BY:-
Mrs. Bindu ThakralAnd
Jaidev Singh
![Page 2: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/2.jpg)
INDEX Introduction PLC Basics PLC and Controls History Advantages of PLCs PLC Operation Comparison to Relay Logic Applications Conclusion
![Page 3: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/3.jpg)
INTRODUCTION
Programmable Logic Control, or PLC as it is universally called, is the ‘work horse’ of industrial automation.
A PLC is used to control, time and regulate the sequence.
Many production processes are controlled using PLCs like – metal machining sequences, product assembly lines and batch chemical processes.
![Page 4: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/4.jpg)
PLC BASICS Programmable Logic Controllers (PLCs), also
referred to as programmable controllers, are in the computer family. They are used in commercial and industrial applications
![Page 5: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/5.jpg)
BASIC PLC OPERATION PLCs consist of input modules or points, a Central
Processing Unit (CPU), and output modules or points.
![Page 6: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/6.jpg)
BASIC PLC OPERATION (CONT..) Pushbuttons (sensors), in this simple example,
connected to PLC inputs, can be used to start and stop a motor connected to a PLC through a motor starter (actuator).
![Page 7: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/7.jpg)
PLC AND CONTROLS HISTORY Large amount of work required connecting
wires
Difficulty with changes or replacements Difficulty in finding errors; requiring
skillful/experienced work force
When a problem occurs, hold-up time is indefinite, usually long
o Too many moving parts
![Page 8: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/8.jpg)
ADVANTAGES OF PLCS Number of wires reduced
by approximately 80%
Fast and easy error detection.
No change in wiring to change program
Needs fewer spare parts Cheaper when large
number of I/O instruments are needed
Less moving parts Compact Cost effective for
installation/maintenance
![Page 9: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/9.jpg)
COMPONENTS
CPU
Memory Areas
Circuits to input oroutput data
Basically, a big box of math
![Page 10: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/10.jpg)
SPECIFIC COMPONENTS
•Input Relays (contacts)
•Output Relays (coils)
•Data Storage
•Internal Utility Relays
•Counters
•Timers
![Page 11: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/11.jpg)
PLC OPERATION
Continually scans ladder diagram
Consists of 3 important steps
![Page 12: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/12.jpg)
PLC SCAN:-
![Page 13: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/13.jpg)
LADDER LOGIC
•Definition
•Comparison to RelayLogic
![Page 14: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/14.jpg)
DEFINITION One form of drawing
electrical logic schematics
Very popular for PLCs
Originally invented for use with relays
![Page 15: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/15.jpg)
COMPARISON TO RELAY LOGIC
First used for technicians,electricians &engineers
Still first choice for most technicians, electricians, etc.
![Page 16: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/16.jpg)
RELAY LOGIC
LADDER LOGIC
![Page 17: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/17.jpg)
•“Jog” function added to previous relay circuit
•1 component added
•3 wires added
![Page 18: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/18.jpg)
•Two status indicators added •6 additional wires
![Page 19: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/19.jpg)
PROGRAMMING
Basics – NO/NC Contacts/Coils AND & OR Gates Timers and Counters Building a PLC Ladder Logic
Programming
![Page 20: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/20.jpg)
BASICS NO Contact
NO Coil (Output)
NC Contact
NC Coil (Output)
![Page 21: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/21.jpg)
AND GATE
![Page 22: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/22.jpg)
OR GATE
![Page 23: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/23.jpg)
TIMERS
Very simple concept, it times
2 basic types, on- delay and off-delay
Still sends logic as its output
![Page 24: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/24.jpg)
COUNTERS Counts number of
times a lever ispulled, a button ispushed, etc.
3 types Up Counter Down Counter Up-Down Counter
![Page 25: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/25.jpg)
BUILDING A PLC/LADDER LOGIC PROGRAM
To illustrate, will start in relay logic, convert to ladder logic at end
Will need to remove/replace some components
![Page 26: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/26.jpg)
Relay Logic converted to Ladder Logic Diagram Much fewer hard wired components Double Pole Pushbutton for Jog switched to
Single Pole Instead of motor relays, PLC just checks state of
motor output
![Page 27: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/27.jpg)
APPLICATIONS:- Manufacturing Industry
Food Industry
Textile Industry
Plastics Industry
And many other……
![Page 28: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/28.jpg)
CONCLUSION :- We can conclude that
A lot of wiring work have been reduced
Error detection has became fast and easy
Size has been reduced
Cost effective for installation/maintenance
![Page 29: PROGRAMMABLE LOGICAL CONTROLLER (PLC) PRESENTED BY:- Mrs. Bindu Thakral And Jaidev Singh](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814883550346895db595a8/html5/thumbnails/29.jpg)
THANKSQ&A