plc elevator ladder logic example pdf

On modern elevators the control logic is PLC based, probably because relays are more expensive than electronic components. Besides a PLC makes simple the electrical connections and reduces the chance of failure. On old elevators the direction of the car is controlled by selectors mounted in the shaft, one at each floor. On modern elevators there may be one impulse switch only, mounted on the top of the car. When the elevator moves the impulse switch detects a sequence of magnets placed in the shaft, then s ....etc

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In Ladder Logic a program is represented by a graphical diagram based on circuit diagrams of relay-based logic hardware. It is mostly used in the development of software for PLCs. The most important advantage of this programming language is that engineers and technicians would be able to grasp it easily because of its resemblance to hardware systems. I am an engineer and I personally have found it very easy to understand. I am sure that Ladder Logic is going to be immensely popular among the engineering community in the years to come. ....etc

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i want a simple project in digital systems using bread board ....etc

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to get information about the topic automatic street light full report ppt and related topic refer the page link bellow

http://seminarsprojects.net/Thread-automatic-street-light-control-using-ldr-full-report

http://seminarsprojects.net/Thread-automatic-street-light-control-embedded-based-project

http://seminarsprojects.net/Thread-automatic-street-light-control-with-sun-tracking

http://seminarsprojects.net/Thread-automatic-street-lights-on-off-using-light-dependent-resistor

http://seminarsprojects.net/Thread-automatic-street-light-control ....etc

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plse give me more information about automatic street light control using vehicle light intensity..plz.urgnt..

plz..give me ful details.. ....etc

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ABSTRACT
Development of a traffic light control system using PLC (Programmable
Logic Controller) is the title of this project. This project is divided into two parts
which are hardware and software. The hardware part for this project is a model of
four way junction of a traffic light. Each lane has two limits switch (input) function
as a sensor. Three indicator lamps with different colours (Red, Yellow and Green)
are installed at each lane for represents as traffic light signal. This limit switches and
indicator lamps are connecte ....etc

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I need a ladder diagram of an intelligent traffic control at a 4 way junction.I am pasting the code.here using potentiometer instead of sensors and when the output is high or density is high that lane gets servicing.else when values are low then sequential operation occurs. a manual switch or emergency switch to let a lane in emergency and after every 2 min all lanes are closed for 30 sec to alloow pedestrians. ....etc

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Prepared by:
SHAMEER N

Under the guidance of
Dr. S ASHOK


Introduction

In the fast developing world, height of the buildings increased tremendously and the lift has become more of a necessary rather than luxury. When the number of floor increased the control mechanism required for the lift will become more complex. Programmable Logic Controllers are widely accepted industrial control device. With the growth in technology PLCs are now capable of advanced data manipulations, communications ....etc

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Ladder diagram for 4 floor elevator,coffee venting machine and a simple four lane traffic system. ....etc

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To get full information or details of automatic street light light controller using ldr please have a look on the pages

http://seminarsprojects.net/Thread-automatic-street-light-control-using-ldr-full-report

http://seminarsprojects.net/Thread-automatic-street-light-control-using-ldr-full-report

if you again feel trouble on automatic street light light controller using ldr please reply in that page and ask specific fields ....etc

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