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Plc Ladder Logic Questions And Answers Pdf

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Are you preparing for a PLC job? Do you want to test your PLC knowledge? Or do you want to learn more about PLC? Whether if you are freshers or experienced, this list of interview questions will add value to your PLC knowledge.

Programmable Logic Controllers (PLC)

Are you a person with a degree in computer or electronics or IT engineering? Are you innovative enough in designing or maintaining then login to Wisdomjobs online site. Programmable logic controller is an industrialist digital computer which has been ruggedized and adapted for the control of manufacturing process, such as assembly live, or robotic devices, or any activity that requires high reliability control and ease of programming and process fault diagnosis.

They were first developed in the automobile manufacturing industry to provide flexible and programmable controllers to replace hand wired sequences. A PLC is an example of a hard real time system since output results must be produced in response to input conditions within a limited time.

Question 1. Question 2. Answer : PLCs are highly reliable, easily programmable, Small and Inexpensive, PLCs can be designed with the communication capabilities so they can converse with the local or remote computer, They can sustain in robust environment less maintenance.

Question 3. Answer : The general language program consists of Ladder Diagrams. Relay logic control scheme is represented in Ladder diagrams. Alternative languages uses Boolean representation of these control schemes as base of the computer representation.

Question 4. Answer : CPU is the brain of the system and consists of Microprocessor: To carry out arithmetic and logical operations. Power Supply: The electrical supply that converts the ac voltage to various DC operating voltages. Question 5. What Is Scan In Plc? Answer : The sequential operation of the controller that goes through the ladder diagram from top to bottom of the ladder. In this process it updates all the outputs corresponding to the inputs.

SCAN takes place from left to right of each rung. Usually SCAN time is in milliseconds and it is a continuous process. Answer : Programmable Logic Controllers are industrially hardened micro computers, designed to replac e electromechanical relays, used to control machines and processes. Question 7.

Answer : 1. Modular design 2. Increased reliability 3. Lower cost 4. Compact size 5. Ease of programming 6. Rugged construction and designed to withstand vibrations, temperature, humidity and noise 7. Ability to communicate with computer. Question 8. Answer : Flexibility of changing the control configuration Ability to use the controller without being a computer expert. Ability to bypass the controller in case it fails.

So that the process still can be controlled manually. Answer : Local control unit is the small collection of hard ware in the system that can do closed loop control. Local control unit interfaces directly to the process.

Question Answer : DCS is used for interfacing and computing functions and also provides the means of communication between the other devices. It consists of local control unit, low level interface, high level interface, shared communication facility Etc. What Is Scada? Answer : Supervisory Control and Data Acquisition SCADA system is computerised hardware and software based project that provides a single integrated view of all control and information resources, enable engineers, supervisors, operators to view and interact with the working of an entire operation through graphical representation of their product process.

Generic Logic c. What Is Cimplicity? It is based on a client server architecture consisting of servers and viewers. Servers are responsible for the collection and distribution of data. Viewers connect into servers and have full access to the collected data for viewing and control actions.

Answer : a. Educed site visits and callouts b. Predictive maintenance which allows proactive rather than reactive planning c. The ability to view and adjust set points remotely d. Reliability and robustness e. Maximize productivity f. Improve product quality g. Reduce your operating and maintenance costs h. Integrate with your business systems i. Preserve your capital investment. Answer : Industrial process: chemical plants, power generation and distribution, Metallurgy etc and nuclear process: reactors, nuclear waste etc.

Sequence control, timing, counting, and data calculation 2. Batch or continuous process control 3. Open loop or feedback control, process data acquisition and display. They have to be hard-wired to perform a specific function 2. No hard-wire requirement 3. When the system requirement change, the relay wiring has to be changed or modified 4. Can be easily changed or expanded through program 5.

Higher power consumption 6. Lower power consumption. Input interface modules accept signals from the machine or process devices Vac and convert them into signals 5Vdc that can be used by the controller. Output interface modules convert controller signals 5Vdc in to external signals Vdc used to control machine or process. What Is Ladder Logicdiagram? This diagram consist of series of symbols interconnected by lines to indicate the flow of current through the various devices. In ladder logic diagram the sides of the ladder forms the power sources and current flows through the various —logic input devices that form the rungs of the ladder.

Popular Interview Questions. All Interview Questions. Programmable Logic Controllers Practice Test. IT Skills. Management Skills. Communication Skills. Business Skills. Digital Marketing Skills. Human Resources Skills. Health Care Skills. Finance Skills. All Courses. All Practice Tests.

Electrical Engineering Interview Questions Question 3. Answer : CPU is the brain of the system and consists of Microprocessor: To carry out arithmetic and logical operations Memory: The area in the CPU in which the information is stored and retrieved Power Supply: The electrical supply that converts the ac voltage to various DC operating voltages. Instrumentational Engineering Interview Questions Question 6.

What Is A Plc? Question 9. What Is Lcu? Four editors: a. Electrical Engineering Interview Questions Question Preserve your capital investment Question Define Scada.

Electrician Assistant Interview Questions Question Open loop or feedback control, process data acquisition and display Question Instrumentational Engineering Interview Questions Question Control Valves Interview Questions.

Questions and problems

Practicing PMP questions on my mobile is so easy with this site. On Monday afternoon, he is on his way to do his last delivery when he gets a call from his daughter Patti and agrees to collect her from school. RELX is a global provider of information-based analytics and decision tools for professional and business customers. None of the above Question 2: Complete the following diagram that shows the elements of a control system. Which will pour more easily? It took about 3 hours.


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PLC Tutorials

Are you a person with a degree in computer or electronics or IT engineering? Are you innovative enough in designing or maintaining then login to Wisdomjobs online site. Programmable logic controller is an industrialist digital computer which has been ruggedized and adapted for the control of manufacturing process, such as assembly live, or robotic devices, or any activity that requires high reliability control and ease of programming and process fault diagnosis. They were first developed in the automobile manufacturing industry to provide flexible and programmable controllers to replace hand wired sequences.

Before the advent of solid-state logic circuits, logical control systems were designed and built exclusively around electromechanical relays. Instead, digital computers fill the need, which may be programmed to do a variety of logical functions. As an acronym, it meant Mod ular Di gital Con troller, and later became the name of a company division devoted to the design, manufacture, and sale of these special-purpose control computers.

I am stealing ladder logic examples for inspiration and solutions to my PLC programs. By looking at examples of ladder logic programs, you will be able to find a solution to your problem very fast. You may even find a smarter solution in the ladder logic examples than your own solution. There are several reasons to use examples of PLC ladder logic. You can skip those and go straight to the PLC program examples:.

30 Most Important PLC Interview Questions and Answers | PLC Quiz

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Первая неделя оказалась последней. Солнечный удар и инфаркт. Бедолага. Беккер ничего не сказал и продолжал разглядывать пальцы умершего. - Вы уверены, что на руке у него не было перстня. Офицер удивленно на него посмотрел. - Перстня.

Странно, подумал он, что сегодня вечером уже второй человек интересуется этим немцем. - Мистер Густафсон? - не удержался от смешка Ролдан.  - Ну. Я хорошо его знаю. Если вы принесете мне его паспорт, я позабочусь, чтобы он его получил.

Я хотел внести исправления тихо и спокойно.

Цепная мутация, которую вы обнаружили в ТРАНСТЕКСТЕ, является частью этой диагностики. Она там, потому что я ее туда запустил. Сквозь строй не позволял мне загрузить этот файл, поэтому я обошел фильтры.

Первый - с личного терминала коммандера, запертого в его кабинете, и он, конечно, исключался. Второй - с помощью ручного выключателя, расположенного в одном из ярусов под помещением шифровалки. Чатрукьян тяжело сглотнул. Он терпеть не мог эти ярусы. Он был там только один раз, когда проходил подготовку.

 - Позвони коммандеру. Он тебе все объяснит.  - Сердце его колотилось.

2 Comments

Tausha B. 28.03.2021 at 21:11

Programmable Logic Controllers are industrially hardened micro computers, designed to replace electromechanical relays, used to control machines and processes.

Herminda M. 02.04.2021 at 01:35

This is an era of technology and everyone relies on technology.

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