Top 100+ Programmable Logic Controllers Interview Questions And Answers
Question 1. What Are Different Components In Plc?
Answer :
Input Interface
Memory Section
Central Processing Unit (CPU)
Programmable Language
Programming tool
An output Interface
Question 2. Advantages Of Plcs Than Hard Wired Relay?
Answer :
PLCs are distinctly reliable, without problems programmable, Small and Inexpensive, PLCs can be designed with the communique competencies so they can communicate with the nearby or far flung laptop, They can sustain in sturdy environment less upkeep.
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Question 3. What Is The Programmable Language Used In Plc?
Answer :
The wellknown language program includes Ladder Diagrams. Relay good judgment manage scheme is represented in Ladder diagrams. Alternative languages uses Boolean illustration of those control schemes as base of the computer representation.
Question four. What Does Central Processing Unit (cpu) Of Plc Consists?
Answer :
CPU is the mind of the device and includes Microprocessor: To perform arithmetic and logical operations
Memory: The area within the CPU in which the records is stored and retrieved
Power Supply:The electric deliver that converts the ac voltage to diverse DC running voltages.
Question five. What Is Scan In Plc ?
Answer :
The sequential operation of the controller that goes thru the ladder diagram from pinnacle to backside of the ladder. In this system it updates all of the outputs corresponding to the inputs. SCAN takes place from left to proper of every rung. Usually SCAN time is in milliseconds and it's miles a continuous technique.
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Question 6. What Is A Plc?
Answer :
Programmable Logic Controllers are industrially hardened micro computers, designed to replac e electromechanical relays, used to manipulate machines and processes.
Question 7. What Are The Main Advantages Of Plc?
Answer :
1. Modular layout
2. Increased reliability
3. Lower price
4. Compact size
5. Ease of programming
6. Rugged creation and designed to withstand vibrations, temperature, humidity and noise
7. Ability to talk with computer
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Question eight. What Is The Need Can Be Satisfied In Designing An Industrial Grade Lcu?
Answer :
Flexibility of changing the control configuration Ability to apply the controller without being a computer expert. Ability to pass the controller in case it fails. So that the system still may be managed manually. Ability of the LCU to communicate with different LCUs and different factors in system.
Question 9. What Is Lcu?
Answer :
Local manage unit is the small series of hard ware inside the machine that may do closed loop manage. Local manipulate unit interfaces immediately to the process.
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Question 10. What Is The Significance Of Dcs?
Answer :
DCS is used for interfacing and computing capabilities and also presents the way of communique among the opposite gadgets. It consists of local manipulate unit, low level interface, excessive stage interface, shared conversation facility Etc.
Question eleven. What Is Scada? Give Any Four Editors Available In Scada Package?
Answer :
Supervisory Control and Data Acquisition (SCADA) device is computerised hardware and software based totally task that offers a single included view of all manage and facts sources, enable engineers, supervisors, operators to view and engage with the running of an entire operation through graphical representation in their product technique.
Four editors:
a. Inkscape SAGE - SCADA Animation Graphic Editor
b. Generic Logic
c. TRACE MODE
d. UCanCode
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Question 12. What Is Cimplicity?
Answer :
CIMPLICITY is a SCADA package deal. It is based on a consumer server architecture such as servers and viewers. Servers are liable for the collection and distribution of facts. Viewers connect into servers and feature full get admission to to the accrued statistics for viewing and manage actions.
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Question 13. List The Potential Benefits Of Scada.?
Answer :
a. Educed website visits and callouts
b. Predictive protection which allows proactive in preference to reactive planning
c. The capability to view and adjust set factors remotely
d. Reliability and robustness
e. Maximize productivity
f. Improve product nice
g. Reduce your working and preservation charges
h. Integrate along with your enterprise systems
i. Preserve your capital investment
Question 14. Mention Some Of The Application Areas Of Scada?
Answer :
Industrial process: chemical flora, energy generation and distribution, Metallurgy and so forth and nuclear method: reactors, nuclear waste and so on.
Question 15. Define Scada.
Answer :
Supervisory Control and Data Acquisition (SCADA) machine is computerised hardware and software based task that offers a unmarried included view of all control and statistics assets, permit engineers, supervisors, operators to view and have interaction with the working of an entire operation through graphical illustration of their product system.
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Question 16. What Are The Major Areas Of Application Of Plc?
Answer :
1. Sequence control, timing, counting, and information calculation
2. Batch or non-stop system manipulate
3. Precise position/movement manage
4. Open loop or comments control, method records acquisition and show
Question 17. What Are The Advantages Of Plc Over Relays?
Answer :
1. They have to be tough-stressed out to carry out a specific function
2. No difficult-wire requirement
three. When the system requirement trade, the relay wiring needs to be changed or changed
four. Can be without difficulty changed or multiplied through program
five. Higher energy intake
6. Lower energy intake
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Question 18. Explain The Functions Of Plc-input And Output Modules:
Answer :
1. Input interface modules accept signals from the system or system gadgets (120Vac) and convert them into alerts (5Vdc) that may be utilized by the controller.
2. Output interface modules convert controller indicators (5Vdc) in to external alerts (120Vdc) used to control gadget or system.
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Question 19. What Is Ladder Logicdiagram?
Answer :
Ladder Logic Diagram is a symbolic language used in PLC. This diagram consist of series of symbols interconnected by way of traces to signify the float of current through the various gadgets. In ladder common sense diagram the sides of the ladder paperwork the power resources and current flows through the various –common sense enter devices that shape the rungs of the ladder.
Question 20. Explain Advantages Of Plcs Than Hard Wired Relay?
Answer :
PLCs are incredibly dependable, easily programmable, Small and Inexpensive, PLCs may be designed with the conversation competencies a good way to communicate with the local or far flung pc, They can preserve in sturdy environment much less upkeep.
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