PLC Programming With Ladder Logic > Interview Questions

Interview Questions

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Overview

In this free PLC courses online with certificate, we will be discussing about the various important PLC interview questions that can be asked to a programmer.

There are so many ways to prepare for the PLC interview questions. You can use this as guide to see what works best for you.

We’ve prepared a list of tips that will help you get ready for your PLC interview. These are some of the best ways to prepare for the conversation: 

- Practice answering questions in a group setting with your friends and family members. This will give you more confidence in your ability to answer difficult questions. 

- Read over some sample answers and practice answering them on your own before going into an interview. This will help you become familiar with what type of answers are expected, and it will also allow you to gauge how well they go over with the interviewer. 

- Keep a journal or diary of all the interviews that you have participated in so far. Record the date of each interview, the name of the interviewer, and what your role was. This will help you remember important comments from previous interviews so that you can incorporate them into future ones.

- Practice answering questions in a group setting with your friends and family members. This will give you more confidence in your ability to answer difficult questions.

The purpose of this video is to provide an overview of the advantages of preparing for PLC interview questions. It will also discuss what skills are needed to answer the questions successfully, and how PLC interview questions can be approached.

The importance of preparing for PLC interview questions for programmers is in the fact that it gives them a better chance at landing their dream job.

In order to land their dream job, programmers need to prepare for PLC interview questions. This will help them get the job they want and make sure that they are prepared for any question that may come their way.


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This is a difficult question to answer because there are many ways that PLCs can be used. However, there are three main uses of PLCs: process control, intelligent control, and fieldbus communication.

Process Control: This is the most common use of a PLC. The process control helps automate an industrial machine or system by performing tasks such as controlling valves, controlling pumps, and controlling motors.

Intelligent Control: This is another common use of a PLC where it helps automate an industrial machine or system by providing flexible logic and decision making capabilities for complex operation requirements.

Fieldbus Communication: This is a third common use of a PLC where it helps support fieldbus communication networks for process and automation control. 

There are a lot of questions that are asked during a typical PLC interview. PLC interview questions can be about programming languages, algorithms, and design patterns. Some of the most common types of PLC interview questions are related to these topics:

Q: What is the difference between an algorithm and a program?

A: An algorithm is a set of instructions you can use to directly accomplish something. A program is a piece of software that contains instructions that are designed to perform tasks or procedures.

Q: What are some design patterns? 

A: There are many design patterns but some common ones include the Factory Method pattern, the Singleton pattern, the Strategy pattern and the Adapter pattern.


  • PLC is programmable logic controller that is used for controlling industrial machinery and processes.
  • There are two types of PLC programming - process programmable controller (PPC) and function programmable controller (FPC). These two types of programming differ in the way they manage data.
  • Process PLC controls the steps by which a machine or process takes place. It records the input, performs calculations, and then provides instructions to the machine or process through motors. Process PPC also manages data input and output through sensors, output actuators, and control devices on the machine or process. The FPC type has a single function that it manages in an algorithm-driven manner.
  • Function PPC programming is when a single step or task needs to be completed by a machine or process.

  • PLC is a programming language most widely used in industry. It is typically found in automation systems, industrial machinery and production lines.
  • Although PLC is quite powerful, it has some limitations that companies need to take into account before implementing it. One of the main limitations of PLC is its complexity and difficulty to learn for new users. Another limitation of PLC is its high cost to implement.
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  • PLC is a software that can be used in different industries. It can be used to manage the inventory and process of transactions, or it could also be used to monitor the progress of a project.
  • This software is an automated system that helps companies get things done more efficiently and effectively. With PLC, there is no need for an employee to do repetitive tasks such as inputting data into a spreadsheet that they use daily.
  • The main objective of PLC is to make life easier for employees by automating processes. This can help employees focus on more important tasks in their work rather than spending time on monotonous or repetitive tasks.

  • A PLC program is an application that can be used to control fixed and/or programmable automation systems. It can control a wide range of devices including motors, sensors, controllers and actuators.
  • PLCs are commonly used in industries such as manufacturing, food processing, power plant operations, water treatment and more for safety purposes.
  • The functions of a PLC program include input/output data communication between the controller and the device(s), data logging, process sequence or operation mode selection.

The personal computer revolution of the past few decades has brought great benefits to society, be it in the form of increased productivity, better quality of life, or greater innovation. The process of how these benefits are achieved has in large part remained constant. However, blockchain technology is being used to disrupt many industries that were previously untouched by it. One industry where this process is already taking effect is the production and logistics industries. Blockchain technology allows for the creation of a decentralized database that can store all the data collected from any point in time along its supply chain in a tamper-proof way. This gives companies more confidence to collaborate with each other and make better decisions when it comes to business operations.

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Course Content

  1. Introduction to PLC Programming
    3m 49s

  1. How to do PLC Programming using Ladder Logic
    15m 14s
  2. Installation of RSLogix Micro Starter Lite
    12m
  3. Elements of RSLogix Micro Starter Lite
    15m 32s

  1. How to Programme and Run the Logic
    19m 14s
  2. PLC Programming of OR Logic Gate
    8m 24s
  3. PLC Programming of AND and NOT Logic Gate
    12m 48s
  4. PLC Programming of NAND,NOR and XOR Logic Gate
    16m 28s

  1. Ladder Logic of Push Button Latching
    14m 16s
  2. Ladder Logic of Interlock Circuit
    21m 25s
  3. Trick to Optimize Use of I-O in Ladder Logic
    5m 33s
  4. Ladder Programming of Motor Operation
    13m 58s
  5. Ladder Logic of Motor Forward Reverse Interlock Protection
    20m 35s

  1. How to Use Timer in Ladder Logic
    17m 39s
  2. On Delay Timer in Ladder Diagram
    8m 39s
  3. Off Delay Timer in Ladder Diagram
    11m 15s
  4. Retentive Timer in Ladder Diagram
    12m 11s
  5. Star to Delta Motor Starter in Ladder Logic
    28m 2s
  6. Counter-up with On Delay Timer Logic
    9m 2s
  7. Countdown with Reset Function in Ladder Logic
    12m 31s
  8. Up-Down Counter Logic with Application in Ladder Logic
    9m

  1. Comparator LIM Block in Ladder Logic
    7m 35s
  2. Comparator EQU,LES,LEQ,NEQ,GRT and GEQ Block in Ladder Logic
    19m 34s
  3. Math Operations in Logic
    30m 16s
  4. Move Blocks in Ladder Logic
    10m 3s
  5. Logical Gate Blocks in Ladder Logic
    22m 5s

  1. Decimal - BCD Conversions in Ladder Logic
    15m 41s
  2. Bit Shift Left and Right in Ladder Logic
    14m 1s
  3. Scale Parameters
    20m 41s
  4. Hacks for Ladder Logic
    10m 11s

  1. Water Tank Filling Control Logic
    27m 57s
  2. Chemical Mixing Process Logic
    33m 11s
  3. Traffic Light Signal Control Logic Part - 1
    23m 41s
  4. Traffic Light Signal Control Logic Part - 2
    36m 46s
  5. Elevator Control Logic
    01h 9m 40s

  1. Assignment of PLC Programming With Ladder Logic
    3m 16s

  1. Interview Questions
    7m 9s

  1. Career Guideline
    2m 42s
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