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Question
what is plc? Basic function of plc? application of plc in
industry? What is lader diagram ? What is the main advantage
to use plc in industry?
 Question Submitted By :: Saikat
I also faced this Question!!     Rank Answer Posted By  
 
  Re: what is plc? Basic function of plc? application of plc in industry? What is lader diagram ? What is the main advantage to use plc in industry?
Answer
# 1
Plc is a simple computer which used for automation of real
world processes such as controlling of machinery in a industry.
Plc is a microprocessor based device with input and output
circuitry that monitors the status of the field connected
"sensor"inputs and controls attached output"actuators"
according to user created logic program.
application: maintaining the water level in a tank between
two float switches by controlling the electric valve.
Ladder diagram is a language which composes of program using
a relay logic symbols as a base in an image similar to a
hardwired relay logic sequence.
advantages
flexibility,pilot running,space efficiency,correcting
errors,visual observation
 
Is This Answer Correct ?    228 Yes 18 No
Eswar
 
  Re: what is plc? Basic function of plc? application of plc in industry? What is lader diagram ? What is the main advantage to use plc in industry?
Answer
# 2
it is used in car parking appartment.
when the sensor is fixed at perticular place,then the car
parks that place then the sensor connection should be
disable.it is used to known, how many cars parks per day.
so in this method is used in car parking appartmen.
 
Is This Answer Correct ?    37 Yes 118 No
Bharath
 
 
 
  Re: what is plc? Basic function of plc? application of plc in industry? What is lader diagram ? What is the main advantage to use plc in industry?
Answer
# 3
I am Agreed with Answer # 1 and 2 .
PLC is Programable Logic Controller and we can used it for
any kind of the industries/home automation or semi-
automation ( As per our requirement ).
 
Is This Answer Correct ?    53 Yes 8 No
Abdul Ahad
 
  Re: what is plc? Basic function of plc? application of plc in industry? What is lader diagram ? What is the main advantage to use plc in industry?
Answer
# 4
A PLC has many "input" terminals, through which it
interprets "high" and "low" logical states from sensors and
switches. It also has many output terminals, through which
it outputs "high" and "low" signals to power lights,
solenoids, contactors, small motors, and other devices
lending themselves to on/off control. PLCs are industrial
computers, and as such their input and output signals are
typically 120 volts AC, just like the electromechanical
control relays they were designed to replace. Although some
PLCs have the ability to input and output low-level DC
voltage signals of the magnitude used in logic gate
circuits, this is the exception and not the rule.
 
Is This Answer Correct ?    22 Yes 11 No
Nilesh Yadav
 
  Re: what is plc? Basic function of plc? application of plc in industry? What is lader diagram ? What is the main advantage to use plc in industry?
Answer
# 5
The PLC is a controller device which is used to control the
logically automated systems.It replaces relays to a single
PLC.Fuctions are motion control, process control, networking
control,distributed controletc.,
 
Is This Answer Correct ?    24 Yes 10 No
Priyaloges
 
  Re: what is plc? Basic function of plc? application of plc in industry? What is lader diagram ? What is the main advantage to use plc in industry?
Answer
# 6
ladder programming is a language . ladder language is a
combination of input contacts and output coils for make a
logic programm.
 
Is This Answer Correct ?    19 Yes 6 No
Ankit Arora
 
  Re: what is plc? Basic function of plc? application of plc in industry? What is lader diagram ? What is the main advantage to use plc in industry?
Answer
# 7
>A programmable Logic Controller (PLC) is a solid state/computerized industrial controller that performs discrete or sequential logic in a factory environment. It was originally developed to replace mechanical relays, timers and counters. PLCs are used successfully to execute complicated control operations in a plant................!!!

>It is field programmable by the user. It allows the user to modify the programs as per the requirements of a plant without having to send the unit back to the manufacturer for this purpose.
>Plant Automation is the necessity for the manufacturing industry to survive in today’s globally competitive market.
 
Is This Answer Correct ?    12 Yes 2 No
Himanshu Patel
 
  Re: what is plc? Basic function of plc? application of plc in industry? What is lader diagram ? What is the main advantage to use plc in industry?
Answer
# 8
A Programmable Logic Controller, or PLC for short, is simply a special computer device used for industrial control systems. They are used in many industries such as oil refineries, manufacturing lines, conveyor systems and so on. Where ever there is a need to control devices the PLC provides a flexible way to "softwire" the components together. 
Is This Answer Correct ?    4 Yes 0 No
Dhara
 

 
 
 
Other Instrumentation Interview Questions
 
  Question Asked @ Answers
 
hi i want sov loop cheak from consol to field the operater given status to sov still no change, but MR room to sov ok so whats a problem and alreasy cheak all conection ok ?   2
Working principle capacitance type level transmitter   2
tell me the temp range of rtd?   7
how to callibrate a new i/p converter TATA 7
A pressure differential gauge type of instrument has a manifold with 2 isolation valves (hp and lp),2 vents(1 each for hp and lp) and 1 equalizing valve. Determine the position of each valve(either fully closed or fully open) when troboulshooting to: 1. zero the transmitter. 2. determine if there is a block in the impulse line. 3. determine if the gauge is functioning properly. The process fluid is water.   1
how to define range of dp level xmeter in open tank   1
why we use negative 24vdc to a proximeter KNPC 4
what is the principale of vortex flow meter. India-Glycols 7
what are turbo generators?   1
1.what is the role of proportional comtroller in pid controller?2.How do u calibrate the control valve? IOCL 3
If I want to buy a pressure switch & 3-way valve for hot water application then witch parameter I should consider.   1
i/p converter always for supply pessure from 3~15 psi only !! And from where this converter bleed the air.   2
 
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