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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 :: Instrumentation
I also faced this Question!!     Answer Posted By  
 
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 ?    245 Yes 18 No
Eswar
 
Answer
# 2
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 ?    58 Yes 9 No
Abdul Ahad
 
 
 
Answer
# 3
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 ?    26 Yes 10 No
Priyaloges
 
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 ?    24 Yes 11 No
Nilesh Yadav
 
Answer
# 5
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
 
Answer
# 6
>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 ?    13 Yes 2 No
Himanshu Patel
 
Answer
# 7
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 2 No
Dhara
 
Answer
# 8
PLC is a kind of processor which we can it use for any
applications, ladder diagram is a language which plc can
understand. there are so many advantages are there we can
use it for any applications but it is depends upon the user
needs and I/O of PLC.
 
Is This Answer Correct ?    2 Yes 0 No
Muthu Kumar
 
Answer
# 9
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 ?    40 Yes 126 No
Bharath
 

 
 
 
Other Instrumentation Interview Questions
 
  Question Asked @ Answers
 
I have flow transmiter DP range is 0 to 5000mmwc,(convert) Display to be show in m3/Hr. Orient 3
Q- Why Phase tester is only used for checking AC not DC ?   1
what is the control valve?how many types of control valves are there Hindustan-Zinc 5
which type signal come control valve   6
What is the reason for not giving very High Proportional Gain Kp in PID Controller? ABB 2
what is AWG?   2
how to calculate density?   1
how in the 2 - wire transmitter, 24v supply and the 4ma signal gets in the same path? Yokogawa 1
what is the PID controller?   1
what is the basic working principle of I/P and Positioner in any control valve. Visa-Steel 10
Why we use 4 to 20 mA, (This is International Standard) instaed of this can we use 4-16, or 4-24 or 3- 15 or any other range ONGC 13
what is flow and flowrate? definate and diffrentiate it? pls post a valid ans thanks in advance Qatar-Gas 2
 
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