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Categories >> Engineering >> Instrumentation


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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  
# 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.
flexibility,pilot running,space efficiency,correcting
errors,visual observation
Is This Answer Correct ?    260 Yes 19 No
# 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 ?    59 Yes 10 No
Abdul Ahad
# 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 ?    28 Yes 11 No
# 4
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 ?    23 Yes 6 No
Ankit Arora
# 5
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 ?    26 Yes 12 No
Nilesh Yadav
# 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 ?    15 Yes 3 No
Himanshu Patel
# 7
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 ?    4 Yes 0 No
Muthu Kumar
# 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 ?    5 Yes 2 No
# 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 is used to known, how many cars parks per day.
so in this method is used in car parking appartmen.
Is This Answer Correct ?    41 Yes 126 No

Other Instrumentation Interview Questions
  Question Asked @ Answers
why temperature transmitter is showing ambienttemp.but 21.5ma. alarm AO showing at the display &how to sloves this problem.   2
what are the following documents comes under loopchecking Heisco 1
Dear all... I have 1 0-400 duplex type RTD, I connected the A side to the temperature indicator and B side to the PLC panel, but when I have observed then found that The PLC side temp has the variation. and it was distub to other RTD temp also. so what can I do.pls help me Worley-Parsons 1
What is derating factor in Motor?   1
what will be the output of a temperature transmitter if temperature is 120 degree celcius? KNPC 6
please help me to get the below mentioned quires,which i have to submit for my client.[INSPECTION TEST PLAN] 1]I.T.P for Calibration of all instrument. 2]I.T.P for SS tubing. 3]I.T.P for Fire & Gas devices. 4]I.T.P for CCTV & telecommunication. 5] I.T.P for loop checking.   1
tell me the temp range of rtd?   7
what is difference between E/P positioner and I/P positioner. Why E/P fixed in below actuator and why I/P fixed in other place   1
how we convert Mili ampere to temp txt,level txt,flow txt,pressure txt range value Saadi-Cement 3
how will do square root transmitter calibration Roche 2
Which instrument used to calibrate the pressure switch?   8
What is the relation between electronics & instrumentation   2
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