List types of memory. Explain any one type of memory in brief.

List types of memory. Explain any one type of memory in brief.
by

1 Answer

Answer :

Types of Memories in PLC: 

i) Executive Memory 

ii) Scratch Pad Memory 

iii) Data Table a) Input image memory b) Output image Memory c) Internal bits/ registers/ words 

iv) User Program


Executive Area. The executive is a permanently stored collection of programs that are considered part of the system itself. These supervisory programs direct system activities, such as execution of the control program, communication with peripheral devices, and other system housekeeping activities. 


OR 


Scratch Pad Area. This is a temporary storage area used by the CPU to store a relatively small amount of data for interim calculations and control. The CPU stores data that is needed quickly in this memory area to avoid the longer access time involved with retrieving data from the main memory. 


OR 


Data Table Area. This area stores all data associated with the control program, such as timer/counter preset values and other stored constants and variables used by the control program or CPU. The data table also retains the status information of both the system inputs and the system outputs. OR User Program Area. This area provides storage for programmed instructions entered by the user. The user program area also stores the control program.

by

Related questions

State the function of PLC memory w.r.t. types, speed of execution.

Description : State the function of PLC memory w.r.t. types, speed of execution.

Last Answer : PLC memory cab be divided into two major types: 1) System memory: a) Executive Memory: The executive is a permanently stored collection of programs that are considered part of the system itself. ... RAM memory is fastest amongst all type of memory. Flash ROM memory is faster than ROM memory. 

List types of timers.

Description : List types of timers.

Last Answer : Types of Timers: Retentive Timers: 1. ON Delay 2. OFF Delay Non Retentive Timers: 1. ON Delay 2. OFF Delay

List any two advantages and any two disadvantages of PLC.

Description : List any two advantages and any two disadvantages of PLC.

Last Answer : Advantages of PLC: i) Increased productivity ii) Increased product quality iii) Increased flexibility and convertibility iv) Reduced manpower v) Reduced cost of product vi) Better inventory control vii) Increased ... v) PLCs are not very good at handling large amount of data, or complex data.

List any four names of optial sensors

Description : List any four names of optial sensors

Last Answer : Optial sensors: i) Photodiodes ii) Phototransistors iii) LDRs iv) Photovoltaic cells v) Optical encoder vi) Scintillation counter vii) Photoionization detector viii) Photographic plates

List any two ratings of digital input and digital output module each.

Description : List any two ratings of digital input and digital output module each.

Last Answer : Ratings of Digital Input Module: i) Rated voltage & current: +24V DC at 4mA/120V AC at 6mA/230V AC at 9mA ii) Specified operational voltage range: 0-30V DC/ 264V AC. iii) Absolute maximum input voltage: + ... / 2A for relay type/0.5A AC vi) Rated current/common: 6A DC/8A for relay type/0.5A AC

List applications of servomotor.

Description : List applications of servomotor.

Last Answer : Applications of Servomotor: 1) Computers 2) Robotics and toys 3) CD/DVD players 4) Textile industries 5) Instrument servos 6) Tracking and guidance system 7) Self-balancing recorders 8 ... 9) Process controllers 10) Electromechanical actuators 11) Air-craft control system 12) Programming device

Explain concept of capacitive type proximity switch with neat schematic diagram.

Description : Explain concept of capacitive type proximity switch with neat schematic diagram.

Last Answer : Capacitive type proximity switch: A capacitive proximity switch is device that senses presence of metallic or nonmetallic objects. The internal circuit consists of an oscillator, threshold detection stage and ... in oscillation amplitude is detected and output switching device is turned on. 

Explain in brief cam. State the types of cam. List two applications.

Description : Explain in brief cam. State the types of cam. List two applications.

Last Answer : Working principle of cam: A cam is mechanical rotating machine element which is used for converting one motion in to another. A cam is a curved or grooved surface which mates with a ... . Printing control mechanisms. Spinning and weaving machineries. Textile machineries. Paper cutting machines.

Explain in brief the working principle of strain gauge. Define gauge factor and list out types of strain gauges.

Description : Explain in brief the working principle of strain gauge. Define gauge factor and list out types of strain gauges.

Last Answer : If a metal conductor is stretched or compressed, the resistance changes as both length and diameter change. There is a change in the value of resistivity of the conductor also when it is ... metal film strain gauges 6. Diffused metal strain gauges 7. Sputter deposited thin metal strain gauge

Explain count up (CTU) instruction with timing diagram.

Description : Explain count up (CTU) instruction with timing diagram.

Last Answer : The CTU is an instruction that counts false-to-true rung transitions. Rung transitions can be caused by events occurring in the program. When rung conditions for a CTU instruction have made a false-to-true ... of Counter up(CTU) Instruction: Too many uploads - please try again in an hour

Explain UP counter instruction of PLC with suitable instruction.

Description : Explain UP counter instruction of PLC with suitable instruction.

Last Answer : The CTU is an instruction that counts false-to-true rung transitions. Rung transitions can be caused by events occurring in the program. When rung conditions for a CTU instruction have made a false-to-true ... accumulated count to zero. Counting can resume when rung 4 goes false again.

Explain pressure actuated switch with neat constructional diagram.

Description : Explain pressure actuated switch with neat constructional diagram.

Last Answer : Pressure actuated switch: A pressure actuated switch is a device designed to monitor a process pressure and provide an output when a set pressure (setpoint) is reached. A pressure actuated switch does this by ... range spring (e.g. if the nt is turned clockwise the trip pressure will be higher). 

Draw power and control circuit for definite time-limit starter for slip-ring induction motor. Explain its working.

Description : Draw power and control circuit for definite time-limit starter for slip-ring induction motor. Explain its working.

Last Answer : Definite Time-limit Starter for Slip-ring Induction Motor: This starter is used for automatic control of acceleration of slip-ring induction motor at the time of starting. In this starter, the ... each phase, shorting the rotor winding terminals and final acceleration of the motor takes place. 

Write the ladder program for 24 hour clock.

Description : Write the ladder program for 24 hour clock.

Last Answer : Ladder Program for 24 hour clock:

Develop the control circuit for star-delta starter used for starting a 3 ∅ induction motor.

Description : Develop the control circuit for star-delta starter used for starting a 3 ∅ induction motor.

Last Answer : Control Circuit for Star-Delta Starter: 1) Automatic Star-Delta Starter: OR 2) Semi- automatic Star-Delta Starter:

Give the full form of SCADA & HMI.

Description : Give the full form of SCADA & HMI.

Last Answer : Full Form of SCADA and HMI:  SCADA:-Supervisory Control and Data Acquisition  HMI :- Human Machine Interface

State the function of seal in circuit w.r.t. PLC.

Description : State the function of seal in circuit w.r.t. PLC.

Last Answer : Standard Start-Stop-Seal circuit:  * The Start-Stop-Seal circuit is as shown in figure. The power circuit consists of 3ph load (Motor) connected by a main contactor (M) to 3-phase supply. The ... * When STOP is pressed, M gets de-energized and motor gets disconnected from supply.

Draw the block diagram of PLC.

Description : Draw the block diagram of PLC.

Last Answer : Block diagram of PLC and input/output devices used for PLC Input/output devices - The input module has bank of terminals for physically connecting input devices, like push buttons, limit switches etc. ... is to translate signals from the PLC's CPU into a form that the output device can use.

State the need of automation.

Description : State the need of automation. 

Last Answer : Need of Automation in Process : * To fulfill the demand of product at right time. * To reduce the human errors and involvement of human being in the process. * For better productivity. * For better ... of process. * For better quality. * For reducing man power. * For reducing cost of product.

Draw block diagram of PID controller

Description : Draw block diagram of PID controller

Last Answer : Block diagram of PID Controller:

Develop power and control diagram for secondary frequency acceleration starter of slip ring induction motor.

Description : Develop power and control diagram for secondary frequency acceleration starter of slip ring induction motor. 

Last Answer : Power and Control Circuit diagram for secondary frequency acceleration starter of slip ring induction motor:

Draw a block diagram of digital output module of PLC.

Description : Draw a block diagram of digital output module of PLC.

Last Answer : Block diagram of digital output module of PLC:

Differentiate between two-wire and three-wire control

Description : Differentiate between two-wire and three-wire control

Last Answer : Two-Wire Control  Three-Wire Control 1 The control component offers only two-wires for its connection in control circuit. The control components offer threewires for their connection in control ... using starter. The safe starting ensures the Novolt protection.  4

Differentiate between power and control wiring

Description : Differentiate between power and control wiring

Last Answer : Power wiring Control wiring 1 Used for connecting load to main power supply through appropriate switchgear and protecting devices such as overload relay contacts Used for ... can be used for connecting control circuit as control circuit does not carry higher current.

Draw construction of DC servomotor.

Description : Draw construction of DC servomotor. 

Last Answer : DC servomotor:

State any two input and output devices of PLC

Description : State any two input and output devices of PLC

Last Answer : Input Devices of PLC: i) Selector switches ii) Push buttons iii) Binary encoders iv) Mechanical/magnetic Limit switches v) Inductive/ capacitive/optical proximity switches vi) Analog transducers ... /Lamps v) Solenoids vi) Continuous/ discrete valves vii)Analog/digital indicators/recorders etc.

Draw block diagram of proportional controller.

Description : Draw block diagram of proportional controller.

Last Answer : Block diagram of Proportional Controller:

Draw ladder diagram for following sequence: i) When NO START Pushbutton is pressed Green light is on. ii) When NC STOP Pushbutton is pressed Red light is on. Green light goes off.

Description : Draw ladder diagram for following sequence: i) When NO START Pushbutton is pressed Green light is on. ii) When NC STOP Pushbutton is pressed Red light is on. Green light goes off.

Last Answer : ladder diagram

List the stages in the evolution of the earth and explain each stage in brief. -Geography

Description : List the stages in the evolution of the earth and explain each stage in brief. -Geography

Last Answer : The earth was mostly in a volatile state during its primordial stage. Due to gradual increase in density the temperature inside has increased. As a result the material inside started getting separated ... years. It can be assumed that life began to evolve sometime 3,800 million years ago,

List any four methods of plotting a compass traverse survey & explain any one in brief. Also state the meaning of adjustment of closing error of traverse.

Description : List any four methods of plotting a compass traverse survey & explain any one in brief. Also state the meaning of adjustment of closing error of traverse.

Last Answer : Methods of plotting compass traverse are: 1. By parallel meridian through each station. 2. By included angle. 3. By paper protractor. 4. By rectangular co-ordinates. 5. ... . 5. Finally join new points to get corrected traverse ABCDEA after graphical adjustment of closing error. 

List any four towers related to WPP. Explain any one in brief.

Description : List any four towers related to WPP. Explain any one in brief.

Last Answer : List of Towers Related to WPP: Tubular Steel / concrete Tower Lattice Tower Guyed Pole Tower Hybrid Tower 1. Tubular steel tower: Generally used for a large wind turbine and normally manufactured in ... type tower and thin, tall lattice type tower in the middle instead of single pole.

Explain in brief mechatronics. List its applications.

Description : Explain in brief mechatronics. List its applications.

Last Answer : Mechatronics: Mechatronics is the synergistic integration of mechanical engineering with electronics and intelligent computer control in designing, manufacturing processes and production. It helps to ... in automobiles for outdoor locking, collision avoidance and ignition and antiroll system 

List the different techniques used for signal conditioning in DAS. Explain in brief Any one signal conditioning technique.

Description : List the different techniques used for signal conditioning in DAS. Explain in brief Any one signal conditioning technique.

Last Answer : Types of Signal Conditioning techniques in DAS: 1) Attenuation 2) Amplification 3) Linearization 4) Filtering 5) Ratiometric conversion 6) Logarithmic conversion  Attenuation: An ... in medical investigatory circuits, photo detectors, ionizing radiation detectors and ultrasound receivers etc.

Describe in brief memory organization of PLC.

Description : Describe in brief memory organization of PLC.

Last Answer : Different types of memory that are generally used in PLC s are as follows: 1. RAM: 2. ROM A.)EPROM B.)EEPROM  In PLC program instructions are stored in the ... is carried out and stored. User memory consists of program files or register table and holds the complete operation.

Enlist different types of traffic island and explain any one in brief with neat sketch.

Description : Enlist different types of traffic island and explain any one in brief with neat sketch.

Last Answer : The different types of traffic island are as follow: (1) Rotary or central islands. (2) Channelising or refuse islands. (1) Rotary or central islands: A traffic island constructed in ... each site of road intersection. A few typical designs of Channelising islands are illustrated below:

State different types of leveling. Explain any one in brief.

Description : State different types of leveling. Explain any one in brief.

Last Answer : Types of Levelling  1. Simple Levelling.  2. Differential Levelling.  3. Fly Levelling.  4. Longitudinal or profile leveling.  5. Cross-Section Levelling.  6. Check Levelling.  1. ... B are taken. The difference of these readings gives the difference of level between A and B. 

What is meant by geologic cycle? State the types of weathering and explain brief.

Description : What is meant by geologic cycle? State the types of weathering and explain brief.

Last Answer : Geologic cycle: The most important of these begins with molten magma from within the earth crystallizing into rock then continues with the rock being broken down into soil and that soil then being ... the break down and decay of rock indeed their part in soil formation is of major significance

Explain differ types of Text clipping in brief.

Description : Explain differ types of Text clipping in brief.

Last Answer : Many techniques are used to provide text clipping in a computer graphics. It depends on the methods used to generate characters and the requirements of a particular application. There are three methods ... then we discard only that portion of character that is outside of the clipping window.

State the meaning of FACTS and explain in brief d-types facts controller.

Description : State the meaning of FACTS and explain in brief d-types facts controller. 

Last Answer : Flexible AC Transmission System (FACTS):- A flexible alternating current transmission system (FACTS) is defined as it is a system composed of static equipment used for the AC transmission of ... so as to increase the transmittable active power. However, more reactive power must be provided.

List any eight component parts of prismatic compass with their function in brief.

Description : List any eight component parts of prismatic compass with their function in brief.

Last Answer : Component parts of compass with their function. Sr.No Component Function 1 Circular metal box  To protect needle and pivot. 2 Steel pivot To carry magnetic ... prism to eye sight of observer 14 Magnetic needle To obtain the north direction. 

List the properties of line insulators in brief

Description : List the properties of line insulators in brief

Last Answer : Following are the properties of line insulators:  A) Electrical Properties of insulating material:- 1. It should have high resistance. 2. It should have high breakdown voltage. 3. It should have high ... of insulating material:- 1. It should have longer life. 2. It should have low cost

Describe the types of Industrial hazards in brief.

Description : Describe the types of Industrial hazards in brief. 

Last Answer : Hazard: A hazard in anything in the work place that has the potential to harm people. It includes objects in the workplace such as machinery or dangerous chemicals.  Types of hazards ... making any explosive substance, also any apparatus, machine or material used with any explosive substance.

Explain in brief product and process type layout

Description : Explain in brief product and process type layout

Last Answer : Product Layout:- It is also known as line layout. It implies that various operations on raw materials are performed in a sequence and the machines are placed along the product flow line i.e. machines are ... lathes will be at one place, all milling machines will be at one place etc

Classify condensers used in thermal power station. Explain each type in brief.

Description : Classify condensers used in thermal power station. Explain each type in brief. 

Last Answer : Types of condenser: Classification: 1. Jet Condenser (Mixing Type) 2. Surface condenser (non Mixing type)  Explanation:-   1. Jet Condenser (Mixing Type) In Jet condenser the steam ... there in no direct contact between the steam and cooling water. This condensate is reused in boiler. 

Draw and explain in brief speed measurement using non-contact type transducer.

Description : Draw and explain in brief speed measurement using non-contact type transducer. 

Last Answer :  i) Photoelectric Tachometer:  This method of measuring speed consists of mounting an opaque disc on the rotating shaft. The disc has a number of equidistant holes on its periphery. At one side of the disc a light source is ... (pulses per second /number of teeth)  = (P/T) rps = (P/T) *60 rpm.

Draw and explain construction of Faiveley type pantograph collector. Also explain its working in brief.

Description : Draw and explain construction of Faiveley type pantograph collector. Also explain its working in brief. 

Last Answer : Faiveley type pantograph collector:  Construction of Faiveley type pantograph collector :  It consists of i) sub frame or base, ii) Articulated system, iii) Pneumatic control system including ... move freely in the slot of slotted rod & pantograph is operated purely by the up springs.

Explain in brief the following: (i) Retting (ii) Ginning (iii) Broadcasting -Geography

Description : Explain in brief the following: (i) Retting (ii) Ginning (iii) Broadcasting -Geography

Last Answer : (i) Retting-It is the soaking of the stalk and the removal of the fibre from the bark after plants are submerged in a pool of gently flowing clear water to separate the long stands of ... (iii) Broadcasting-The scattering of seeds by hand over the soil is called Broad casting method of sowing.

Explain in brief the history of land reclamation in Mumbai. -SST 10th

Description : Explain in brief the history of land reclamation in Mumbai. -SST 10th

Last Answer : Originally Bombay was a city of several islands which were joined into one land mass over a period of time. The first project began in 1784, when the Governor of Bombay, William Hornby, ... miles. As the population continued to increase rapidly, more and more area was reclaimed from the sea.

Explain in brief the ‘Dandi March’. -SST 10th

Description : Explain in brief the ‘Dandi March’. -SST 10th

Last Answer : (i) Mahatma Gandhi started his famous Salt March' or Dandi March' on 11th March, 1930 accompanied by 78 of his trusted volunteers. (ii) The march was to cover 240 miles from Gandhi ... law by manufacturing salt by boiling sea water. (iv) This marked the beginning of Civil Disobedience Movement.