User Account

All Pages

What is a programmable logic controller

Assignment Help Electrical Engineering
Reference no: EM131069457

1. What is a programmable logic controller (PLC)?

- Most widely used industrial process control technology.
- Is an industrial grade computer that is capable of being programmed to perform control functions.
- Is designed for multiple input and output arrangements.
- A digital computer designed for use in machine control.

2. Identify four tasks in addition to relay switching operations that PLCs are capable of performing.
- Timing, counting
- Calculating
- Comparing
- the processing of analog signals

3. List six distinct advantages that PLCs offer over conventional relay-based control systems.
- Lower cost
- Increased reliability
- Flexibility
- Communications capability
- Faster response
- Easier to troubleshoot
- Modify

4. Explain the differences between open and proprietary PLC architecture.
- An open architecture design allows the system to be connected easily to devices and programs made by other manufacturers. A system with a closed architecture is one whose design is proprietary, making it more difficult to connect to other systems.

5. State two ways in which I/O is incorporated into the PLC.
- Fixed
- Modular

6. Explain the main function of each of the following major components of a PLC:
- Processor module (CPU): The CPU controls all PLC activity and is designed so that the user can enter the desired program in relay ladder logic.
- I/O modules: The purpose of this interface is to condition the various signals received from or sent to external field devices
- Programming device: A programming device is used to enter the desired program into the memory of the processor.
- Power supply module: The power supply supplies DC power to other modules that plug into the rack.

7. What are the two most common types of PLC programming devices?
- Hand held
- PC

8. Explain the terms program and programming language as they apply to a PLC.
- A program is a user-developed series of instructions that directs the PLC to execute actions.
- A programming language provides rules for combining the instructions so that they produce the desired actions.

9. The programmable controller operates in real time. What does this mean?
- That an event taking place in the field will result in an operation or output taking place.

10. Compare the method by which the process control operation is changed in a relay-based system to the method used for a PLC-based system.

- If a relay system were used, it would require some re-wiring of the circuit to achieve the desired change. However, if a PLC system were used, no rewiring would be necessary. The inputs and outputs are still the same. All that is required is to change the PLC ladder logic program.

11. List four criteria by which PLCs are categorized.
- functionality
- number of inputs and outputs
- cost
- physical size

12. What is the memory capacity, expressed in bits, for a PLC that uses 16-bit words and has an 8 K word capacity?
- Memory capacity is maximum value of memory on PLC for stores data instruction, and control program. 16 * 8 * 1024 = 131072 bits

Reference no: EM131069457

Questions Cloud

Find the potentials at the internal grid nodes : If the potential inside the box follows a 2D Laplace equation, plot the 2D grid, and start from all zeros initial solution for internal nodes, then: Find the potentials at the internal grid nodes, using Standard Liebmann's Method (i.e. λ = ??), aft..
Primary negative consequence of not spreading : What is the primary negative consequence of not spreading the inoculum evenly over the agar surface?
Example of a digestive disorder : What is an example of a digestive disorder that is closely linked to a particular time or place?
Unopened plates affect the reliability : How does growth on the unopened plates affect the reliability (your interpretation) of the other plates?
What is a programmable logic controller : What is a programmable logic controller (PLC) - Identify four tasks in addition to relay switching operations that PLCs are capable of performing.
Discuss the process osha uses for a workplace inspection : Briefly outline and discuss the process OSHA uses for a workplace inspection from the beginning to the end of the site visit.
What from an industrial hygiene standpoint : Using the internet, look up the details about this disaster. In your own words describe the problem and what, from an Industrial Hygiene standpoint, contributed to the deaths of the workers.
Describe the difference between a twa and stel : Describe the difference between a Time-Weighted Average (TWA), Short-Term Exposure Limit (STEL) and a Ceiling limit (C). Provide examples of each to help demonstrate the difference between these OEL duration types.
Two organism in a mixture and organism : Suppose you have two organism in a mixture and organism A is 1000 times abundant than organism B. Will you ( without counting on good luck!) Be able to isolate organism Be using the spread plate technique? Explain your answer

Reviews

Write a Review

Electrical Engineering Questions & Answers

  Find the closest distance to the load plane

A 50 ohmlossless air transmission line is terminated in a load impedance ZL = 12.5 + j20 ohm. Find the following using a Smith Chart: the load admittance YL. the closest distance to the load plane where the normalized admittance on the line is 1 + j..

  Find the thevenin equivalent of the network with terminals

A Thevenin equivalent can also be determined from measurements made at the pair of terminals of interest. Assume the following measurements were made at the two external terminals a, b of a circuit.

  In how many ways can a class of 30 students select committe

In how many ways can a class of 30 students select a committe from the class that consists of a president, a vice president, a treasurer, and a secretary A. if any student may serve either of these roles but no student may serve in multiple roles ..

  What are some of the benefits of smart grid application

In the presentation, "IT and Smart Grid" the presenter, Dr. Peter Will, provided several definitions of "smart-grid". Provide your definition of smart-grid the way you understand it. What are some of the benefits of "smart grid" application

  Define digital signal processing problem

generated by a loud speaker is reflected at two different walls with reflection coefficients r1 and r2. the signal x(t) recorded by amicrophone close to the loud speaker, after sampling is

  Load flow study for a power system

The objectives of this project are to carry out the load flow study for a power system with at least 10 buses. The detailed steps are as follow:

  Determine the number of quantization levels

Work out the following problem: If the analog signal to be quantized is a sinusoidal waveform, that is, x(t) = 6 sin (6283t), and if the bipolar quantizer uses 8 bits, determine 1. Number of quantization levels; 2. Step size of the quantizer ; 3. ..

  Determine n-type body doping concentration na

Write an equation to help determine P-type body doping concentration Na for a required threshold voltage V (sub TN) for an N-channel Al-Sio(sub 2) -Si MOSFET.

  Compute the voltage gain input and output resistance

Consider the common-source amplier shown in Figure. The NMOS transistor has KP = 50 A/V2, L = 5 m, W = 500 m, Vto = 1 V, and rd = ∞. Determine the values of IDQ, VDSQ, and gm.

  Estimate the minimum charge needed to breakdown the air

A) A sheet of paper has a charge of 1 nC/m^2. Estimate the electric field on its surface and show it in a diagram. B) A copper plate has a radius of 10 cm. It has a total charge of 1 nC. Will the air around the plate break down.

  What instruction is used to change the opacity

In animation programs, special effects are achieved by changing the properties of objects. What instruction is used to change the opacity and color properties of objects in the Zeus example world?

  Determine the focal length necessary for the lens

Determine the FWHM diameter of the beam 50 mm from the second lens (ie. 100 mm from the first lens.) A third lens is placed at the point with a focal length off.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +1-415-670-9521

Phone: +1-415-670-9521

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd