PLC Programming Engineer

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PLC Programming Engineer Interview Questions and Answers

Updated 3 Sep 2024

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Q1. What is PLC interlocking

Ans.

PLC interlocking is a method used to prevent conflicting actions or conditions in a programmable logic controller system.

  • PLC interlocking ensures that certain conditions must be met before a specific action can be taken.

  • It helps prevent dangerous or undesirable situations by enforcing logical constraints.

  • Examples include preventing two motors from running simultaneously or ensuring that a door must be closed before a machine can start.

  • Interlocking can be achieved through soft...read more

Q2. What is PLC scaning time

Ans.

PLC scanning time is the time taken by a PLC to complete one full scan cycle of reading inputs, executing logic, and updating outputs.

  • PLC scanning time is typically measured in milliseconds.

  • Factors affecting PLC scanning time include the complexity of the program, number of I/O points, and processor speed.

  • Optimizing program logic and reducing unnecessary tasks can help improve PLC scanning time.

  • For example, a PLC with a scanning time of 10ms means it takes 10 milliseconds to ...read more

Q3. What is SCADA and use

Ans.

SCADA stands for Supervisory Control and Data Acquisition. It is a system used for monitoring and controlling industrial processes.

  • SCADA systems are used in various industries such as manufacturing, energy, water treatment, and transportation.

  • They collect data from sensors and equipment in real-time, allowing operators to monitor processes and make decisions.

  • SCADA systems can also control processes remotely, enabling automation and improving efficiency.

  • Examples of SCADA softw...read more

Q4. PLC and HMI definition, what is tag

Ans.

PLC is a programmable logic controller used to automate industrial processes. HMI is a human-machine interface for interacting with machines. Tags are variables used in PLC programming.

  • PLC (Programmable Logic Controller) is a device used to control industrial processes through programming.

  • HMI (Human-Machine Interface) is a graphical interface that allows users to interact with machines.

  • Tags are variables used in PLC programming to store data and communicate between different ...read more

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Q5. What is PLC , SCADA and definition

Ans.

PLC stands for Programmable Logic Controller, SCADA stands for Supervisory Control and Data Acquisition.

  • PLC is a digital computer used for automation of electromechanical processes.

  • SCADA is a system for remote monitoring and control of industrial processes.

  • PLC is used to control machinery in manufacturing, while SCADA is used for monitoring and controlling processes in industries like power plants.

  • PLC programming involves writing logic for controlling inputs and outputs.

  • SCADA...read more

Q6. Any 2 language PLC explain

Ans.

Two common PLC programming languages are ladder logic and structured text.

  • Ladder Logic: graphical programming language resembling electrical relay logic diagrams

  • Structured Text: text-based programming language similar to high-level programming languages like C or Pascal

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Q7. HMI working principle

Ans.

HMI stands for Human Machine Interface, it is a device or software that allows users to interact with machines or systems.

  • HMI allows users to monitor and control processes in real-time

  • It provides a graphical interface for users to interact with machines

  • HMI can display data, alarms, trends, and other information to operators

  • Examples of HMI include touchscreens, push buttons, and software applications

Q8. What is protocol

Ans.

A protocol is a set of rules and guidelines for communication between devices or systems.

  • Protocols define the format, timing, sequencing, and error checking of data exchange

  • Examples include TCP/IP, HTTP, Modbus, and Profibus

  • Protocols ensure that devices can communicate effectively and reliably

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