Give the classification of PLC. Explain modular PLC in brief.

Give the classification of PLC. Explain modular PLC in brief. 
by

1 Answer

Answer :

CLASSIFICATION OF PLC

PLC can be classified as follows

1.According to structure of PLC

a. Integral type

b. Modular Type

2. Depending upon the no. of I/Os

a. Small(<100)

b. Medium(<10000)

c. Large(>10000)

3. Depending upon the I/Os supported

a. Digital

b. Analog


Modular PLC * Modular PLC Modular PLC is a constituent part of the PLC, are made of several separate modules, such as CPU module, I / O modules, power modules (including some in the CPU module) and a variety of functional modules. * Modular PLC by the frame or the substrate and the various modules. * Module installed in the socket frame or substrate. * Features The modular PLC is flexible configuration, the system can choose different sizes according to needs, and easy to assemble, easy expansion and maintenance. * Large and medium-sized PLC generally use the modular structure. 

by

Related questions

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.

List & explain the timer instruction of PLC. Draw the ladder diagram to verify (i) OR gate& (ii) NOR gate logic

Description : List & explain the timer instruction of PLC. Draw the ladder diagram to verify (i) OR gate& (ii) NOR gate logic 

Last Answer : Depending on the time delay and operation, there are two types of timers  * PLC timer- (i) ON delay timer  (ii) OFF delay timer Description (i) ON delay timer 1) This instruction counts time interval when ... a) OR gate ladder diagram y = A + B b)NOR gate ladder diagram

Explain the need of PLC in automation.

Description : Explain the need of PLC in automation.

Last Answer : Need of PLC in automation * To reduce human efforts. * To get maximum efficiency from machine and control them with human logic * To reduce complex circuitry of entire system * To eliminate ... in working conditions. * Fast and Easily programmed and have an easily understood programming language. 

Draw typical wiring details & four specifications of AC output module of PLC.

Description : Draw typical wiring details & four specifications of AC output module of PLC.

Last Answer : The below figure show the basic field wiring for digital 120V AC output module. The Wiring diagrams show how wires of output devices are connected to screw terminals of PLC modules. As per the wiring ... excessive current from damaging the wiring to the field devices.  Specifications:-

List any four input and four output devices used with PLC.

Description : List any four input and four output devices used with PLC.

Last Answer : Input device: 1. Push button. 2. Temperature switches. 3. Limit switches. 4. Pressure switches. 5. Level Switches. 6. Proximity Switches. Output devices: 1. Motor. 2. Display. 3. Heater coil. 4. Relay. 5. Lamp. 6. Buzzer.

Define with respect to PLC i) scanning cycle ii) speed of execution.

Description : Define with respect to PLC i) scanning cycle ii) speed of execution.

Last Answer : Scanning Cycle * It is number of states/steps which the controller follows when it is put in RUN mode. * It is also called as operating cycle and is defined as the number of states ... is referred as a speed of execution. Higher CPU speeds provide faster performance that shortens task time. 

Describe in brief primary classification of surveying

Description : Describe in brief primary classification of surveying

Last Answer : Primary Classification Geodetic Survey The geodetic surveying is that type of surveying which takes into account the curvature of earth's surface. It is generally adopted for large area (more than ... large scale such as Bridges, Dams, Location and Construction of canals, highways, railways etc.

Explain with block diagram the working of programmable logic control system. (PLC).

Description : Explain with block diagram the working of programmable logic control system. (PLC).

Last Answer : Programmable logic controller:  Block diagram: OR Explanation: PLCs are industrially hardened microcomputers that perform discrete or continuous control functions in a variety ... provides an interface between the PLC and user during program development, start-up and trouble shooting

Draw and explain schematic of PLC based automatic car parking barrier system.

Description : Draw and explain schematic of PLC based automatic car parking barrier system.

Last Answer : Explanation: Automatic car parking system allow to park maximum numbers of car in parking zone according to size of parking zone. parking zone number of vehicle parked in parking zone is less ... available parking space then automated parking system does not allow enter next car in parking zone. 

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.

List and explain the different counters of PLC in detail.

Description : List and explain the different counters of PLC in detail.

Last Answer : A counter in PLC is an instruction equivalent to mechanical counter. A counter block of PLC has two control inputs, Count line and Reset line. When count line makes FALSE-to-TRUE transition, the counter ... down counter. The up-down counter has three inputs, count up, count down and reset.

(i) List and explain the types of ROM. (ii) List any four advantages of PLC.

Description : (i) List and explain the types of ROM.  (ii) List any four advantages of PLC.

Last Answer : ROM types  1) PROM  2) EPROM  3) EEPROM  1) PROM: - (Programmable Read Only Memory): In this memory it may be programed once and once only, by the user/programmer. The user than programs ... signals.  10) PLC can provide security for ladder programming.  11) Speed of PLC is in milliseconds.

Draw and explain analog input module of PLC.

Description : Draw and explain analog input module of PLC.

Last Answer : Analog input module are used for supplying analog input signal to PLC. Analog signals are generated by transducers, potentiometers. PLCs analog input module consists of analog-to-digital converter (ADC). ... of PLC. PLC reads the binary number and takes further decision based on the required logic 

Explain the function of ROM & RAM memory of PLC.

Description : Explain the function of ROM & RAM memory of PLC. 

Last Answer : Read Only Memory (ROM) is used by PLC for storing operating system. The operating system is programmed by the manufacturer.  Random access memory (RAM) is a Read Write memory and used by ... store temporary data like status of I/O pins, temporary results of calculations, timer counter values etc.

Draw the block diagram for PLC power supply and explain the function of each block.

Description : Draw the block diagram for PLC power supply and explain the function of each block.

Last Answer : PLC power supply generates the required dc voltage levels for operation of the internal circuit of PLC. It is a switched mode power supply which accepts wide range of AC/ DC input ... of power failure from AC input, Battery backup becomes active and prevents accidental shut down of PLC

Define opto-isolator. Explain the role of opto-isolator in PLC.

Description : Define opto-isolator. Explain the role of opto-isolator in PLC.

Last Answer : Role of optoisolator in PLC: An optoisolator is a semiconductor device that uses a short optical transmission path to transfer an electrical signal between circuits or elements of a ... disruptions, optoisolators offer a safe interface between high-voltage components and low-voltage devices.

Draw a neat labelled diagram of PLC. Explain the function of each block.

Description : Draw a neat labelled diagram of PLC. Explain the function of each block.

Last Answer : Block Diagram of PLC:-  A simplified block diagram of a PLC shown in above Fig. It has three major units/sections.  I/O (Input/Output) Modules.  CPU (Central ... membrane keypad for program entry, and a display device (LED or LCD) for viewing program steps of functions. 

Explain ON delay timer and OFF delay timer of PLC.

Description : Explain ON delay timer and OFF delay timer of PLC.

Last Answer : On delay timer operates such that when rung containing timer is true, the timer starts counting time ticks. At the end of timer preset time period, output is made active. The off- ... is an operation to turn OFF output when preset time expires after a predetermined input is given.

Explain how a Programmable Logic Controller (PLC) is different from an ordinary personal computer. Also write the advantages and disadvantages of PLC.

Description : Explain how a Programmable Logic Controller (PLC) is different from an ordinary personal computer. Also write the advantages and disadvantages of PLC.

Last Answer : PLC PC 1 It has embedded processor with limited computing power It has a CPU with high computing power  2 Design of PLC is for reliable operation in industrial ... 3) Use of PLCs may be restricted in some high heat, vibration environment not suitable for electronic circuit

What is a PLC Memory?

Description : What is a PLC Memory?

Last Answer : Memory is the component that stores information, programs, and data in a PLC. See more..... projuktiponnoThe process of putting new information into a memory location is called writing. The process of ... When a new ladder logic program is loaded into a PLC's memory, the old program that was

What is plc inverter?

Description : What is plc inverter?

Last Answer : This allows the 3G3MV increased intelligence and autonomy for tasks such as positioning and synchronization. Combining the inverter and PLC eliminates the cost and delay of point-to- ... enhanced speed, positioning and function control for the application being controlled. See More industrialstorebd

Why we use PLC?

Description : Why we use PLC?

Last Answer : CPU or processor: The main processor (Central Processing Unit or CPU) is a microprocessor-based system that executes the control program after reading the status of field inputs and then sends ... separate device (generally a PC), loaded with HMI (Human Machine Software).know more plcinverterhmi

What does plc mean ?

Description : What does plc mean ?

Last Answer : The Plc is an acronym for Please .

Is McDonalds a ltd or plc?

Description : Is McDonalds a ltd or plc?

Last Answer : Need answer

An Inside Look at Lloyds TSB Bank Plc?

Description : An Inside Look at Lloyds TSB Bank Plc?

Last Answer : Although Lloyds TSB Bank Plc was technically founded in 1995, the history of this important British clearing bank dates all the way back to 1765. Over the years, the bank has grown to become one ... was traded under the name Lloyds Bank Limited throughout the majority of the 20th Century. In 1995,

Where can I find PLC training classes in Columbus, OH?

Description : Where can I find PLC training classes in Columbus, OH?

Last Answer : There are several PLC training classes in Columbus, OH. An online search or visiting local colleges are good places to find training classes. You should access the websited Findaseminar.com. ... online for up to thirty days. Findaseminar also schedules conferences, onsite training and workshops.

What is PLC programming and who uses it?

Description : What is PLC programming and who uses it?

Last Answer : PLC stands for "programmable logic controller". PLC's are usually used to control machinery in automated processes such as manufacturing. PLC programmers usually complete a trade school certificate before starting their careers.

What's PLC programming training?

Description : What's PLC programming training?

Last Answer : A PLC programming training is what is known as Programming Language connection. It is basic computer software building. It commands your computer to do certain things.

Designing And Programming PLC Units?

Description : Designing And Programming PLC Units?

Last Answer : A programmable logic controller is a small computer device that records information in real time and sends the results to another location. These instruments are commmonly found in automobiles, heavy ... often change how their products behave, meaning that new PLC units are constantly being created.

What are some companies that offer PLC programming training?

Description : What are some companies that offer PLC programming training?

Last Answer : Many technical training colleges and institutes offer PLC programming training courses. Some of these include AmericanTrainCo.com, GBTechTraining.com, PLCTechnician.com and many others.

What is PLC programming training?

Description : What is PLC programming training?

Last Answer : I would suggest you look into the news paper of your local community or look for in the news boards of the community college or community centers that's in your town

Choosing the Best PLC Training?

Description : Choosing the Best PLC Training?

Last Answer : A programmable logic controller, or PLC technician, is a professional who designs, installs and repairs automated control systems and other equipment in manufacturing facilities. PLC technicians are highly ... technician, there are dozens of programs, workshops and schools for you to choose from.

Finding and Choosing PLC Training Classes?

Description : Finding and Choosing PLC Training Classes?

Last Answer : Finding the right PLC training classes means doing some research and thinking about what one wants from a program. This is a chance to really invest in a great degree and program that can link ... one's career and education are affected which is why people need to take this decision seriously.

What is the best way to larning PLC Program?

Description : What is the best way to larning PLC Program?

Last Answer : Answers is the place to go to get the answers you need and to ask the questions you want

What is the best way to larning PLC Program?

Description : What is the best way to larning PLC Program?

Last Answer : Answers is the place to go to get the answers you need and to ask the questions you want

What is the purpose of DIODE across the interposing coils in PLC?

Description : What is the purpose of DIODE across the interposing coils in PLC?

Last Answer : To dissipate the stored energy in magnetic field of the interposing coils (Free wheeling action). If it is not provided the stored energy will affect the PLC card circuit.

What is the difference between PLC and DCS?

Description : What is the difference between PLC and DCS?

Last Answer : Ans-PLC means Programmable Logic Controller, which can be used to control one particular control system such as a boiler or a injection system. but DCS is Distributed control syetem, which is used ... the total process plant. in DCS we have no of controllers connected to a single monitoring system.

What is the difference between DCS & PLC & SCADA ?

Description : What is the difference between DCS & PLC & SCADA ?

Last Answer : Ans-PLC stands for Programmable Logic ControllerDCS for Data control SystemSCADA for Supervisory Control And Data Acquisition SCADA involves supervision by a user in most cases the plant controller.Whereas PLC ... ystem already in it but for PLC sydtem addition all SCADA software must be provided.

Lewis PLC is breaking down and classifying costs to determine which are associated with specific marketing activities. Lewis is performing a A)marketing cost analysis. B)sales analysis. C)marketing audit. D)cost audit. E)variable cost analysis.

Description : Lewis PLC is breaking down and classifying costs to determine which are associated with specific marketing activities. Lewis is performing a A)marketing cost analysis. B)sales analysis. C)marketing audit. D)cost audit. E)variable cost analysis.

Last Answer : A)marketing cost analysis.

Electro PLC has centralised marketing operations with personnel who direct marketing research, distribution, sales, advertising, and so forth reporting directly to the marketing director. The marketing department is organised by A)product. B)region. C)types of customers. D)function.

Description : Electro PLC has centralised marketing operations with personnel who direct marketing research, distribution, sales, advertising, and so forth reporting directly to the marketing director. The marketing department is organised by A)product. B)region. C)types of customers. D)function.

Last Answer : D)function.

Historically, Knox PLC sold industrial clamps directly to firms using these items in their production process. Knox's Chairman believes that it may be time to start using an industrial distributor because of the ability of such firms to: A)provide Knox with market information. B)supply technical information to Knox. C)provide customers with more competitive pricing. D)carry a more complete line of Knox clamps. E)market the products to Knox specifications.

Description : Historically, Knox PLC sold industrial clamps directly to firms using these items in their production process. Knox's Chairman believes that it may be time to start using an industrial distributor because ... D)carry a more complete line of Knox clamps. E)market the products to Knox specifications.

Last Answer : A)provide Knox with market information.

If Roberts PLC finds that the average total cost of its radar detectors and the marginal cost of its radar detectors are both £85, then: A)its marginal costs are falling. B)average total cost is at its maximum. C)average total costs are rising. D)demand is elastic. E)average total cost is at its lowest level.

Description : If Roberts PLC finds that the average total cost of its radar detectors and the marginal cost of its radar detectors are both £85, then: A)its marginal costs are falling. B)average total cost is at ... average total costs are rising. D)demand is elastic. E)average total cost is at its lowest level.

Last Answer : E)average total cost is at its lowest level.

Roberts PLC notices that if it produces fifteen radar detectors, its costs are £1,500 and if it produces sixteen radar detectors, its costs are £1,590. In this instance, £90 is the firm's ________cost. A)average B)fixed C)variable D)marginal E)average variable

Description : Roberts PLC notices that if it produces fifteen radar detectors, its costs are £1,500 and if it produces sixteen radar detectors, its costs are £1,590. In this instance, £90 is the firm's ________cost. A)average B)fixed C)variable D)marginal E)average variable

Last Answer : D)marginal

Concerned about the impact on her firm's promotional messages, Karen Dickson of Magnum PLC., seeks an approach with immediate feedback. She is most likely to achieve this through. A)television advertising B)newspaper advertising C)publicity D)personal selling E)sales promotion

Description : Concerned about the impact on her firm's promotional messages, Karen Dickson of Magnum PLC., seeks an approach with immediate feedback. She is most likely to achieve this through. A)television advertising B)newspaper advertising C)publicity D)personal selling E)sales promotion

Last Answer : D)personal selling

How a PLC can be used to handle an analog input? Justify.

Description : How a PLC can be used to handle an analog input? Justify.

Last Answer : Diagram:-- Explanation: For analog operation, the level of a PLC input signal is sensed by an analog input module, like in a data acquisition system when input parameters may ... first converted into machine code and then the necessary control signals are generated to the output module. 

Drawthe PLC ladder diagram of ON-OFF control of lamp. Write the input and output devises.

Description : Drawthe PLC ladder diagram of ON-OFF control of lamp. Write the input and output devises.

Last Answer : Diagram:

Describe the working of PLC based automic car park barrier system with block diagram.

Description : Describe the working of PLC based automic car park barrier system with block diagram.

Last Answer : Diagram: Explanation: * Automatic car parking system allow to park maximum numbers of car in parking zone. * According to size of parking zone. In parking zone number of vehicle ... to available parking space then automated parking system does not allow enter next car in parking zone. 

Selection Criteria of PLC

Description : Selection Criteria of PLC

Last Answer : Selection criteria :- To select PLC for any particular application following points are to be considered. a) Type of PLC: Analog or Digital b) Number of inputs and outputs to PLC c) Operating voltage ... Type of memory of PLC g) Type of programming h) Reliability of PLC i) Flexibility of PLC

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. 

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.