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P1: Describe the selection criteria and a practical application for a unitary, a modular and a rack-mounted programmable controller.

Centre No: 04943

Technical Education Centre for Online Learning

Assignment Brief (Learner to fill in all parts highlighted in yellow)

Programme Title:

BTEC Level 3 in Engineering (AME):

(Development Technical Knowledge) FD/Award/Certificate/Diploma

Programme No:

DLGV2, CYLG1C,

GSM3/4/5,

DCJM6/7, DKRT9

Unit Number and Title:

A19: Selection & Application of Programmable Logic Controllers

 

 

Coursework Title:

Selection & Programming

Coursework Number:

UA19A1

Date issued / downloaded

 

Duration

 4 weeks

Student Name

 

Assessor

G Tweed

Task No

Assessment criteria covered

Date Achieved

Feedback

 

1st

Attempt

2nd Attempt*

Comment

Attached?

 

Grading criteria: P1, P2, P3, M1, M2, D1, D2

 

1

P1: Describe the selection criteria and a practical application for a unitary, a modular and a rack-mounted programmable controller.

 

 

 

 

 

2

P2: Explain the system hardware and software requirements for a programmable controller application.

 

 

 

 

 

3

P3: Use a programmable technique to produce, store and present a program that demonstrates the full range of instruction types.

 

 

 

 

4a-b

M1: Explain the benefits and limitations of a programmable controller for a specific application.

 

 

 

 

 

4c-d

M2: Explain the programming technique used and the list of instruction types

 

 

 

 

5

D1: justify the choice of a specific programming technique and the methods used to produce, store and present the program

 

 

 

 

6

D2: compare the current capabilities and limitations of

a programmable controller and identify possible areas of future development.

 

 

 

 

Scenario: You are starting out as an apprentice technician where you need to understand a range of PLC programs. You have been asked to explain these and to use a PLC package such as LOGO to build and test different types of analogue and digital circuits.

 

Evidence you must produce for this assignment: Written report with appropriate diagrams. Also a copy of PLC files.

 

Sources of information:

Unit A19 course notes sections 1 and 2.

Programmable Logic Controllers 4th Edition (W Bolton)

PLC Siemens LOGO user manual

 

*Re-submission Conditions: Only one opportunity to re-submit work will be allowed for each task. All three of the conditions below must be met if this is to be allowed: These are that:

  • You have met the original ‘deadline’ date or agreed extension date. The normal extension on receipt of approved extenuating circumstances will be 5 days
  • Your tutor judges that you will be able to provide improved evidence without further guidance
  • Your tutor can be sure that the evidence submitted is your own work, and that you have signed a declaration of authenticity declaring that it is your own work.

A resubmission date will be set for 15 working days after the assessment has been returned to you.

 
           

 

 

Coursework

Internal Verifier : Sign

 (WWatson)

Date

(Revision)

26/3/21

(r2021a)

                                                                                        

Assessment Record Sheet 

1. Learner to fill in on first submission:

Task ref(s)

Evidence submitted

(e.g. written report, calculation, file name).

Task ref(s)

Evidence submitted

(e.g. written report, calculation, file name).

 

 

 

 

 

 

 

 

Additional learner comments to the assessor:

 

Learner Declaration on Submission

I certify that the evidence submitted for this assignment is my own. I have clearly referenced any sources used in the work. I understand that false declaration is a form of malpractice.

Learner Signature.

Date.

 

 

           

 2. Assessor to fill in on first submission:

Task ref(s)

Assessor comment on task(s)

Task ref(s)

Assessor comment on task(s)

 

 

 

 

 

 

 

 

General feedback from the Assessor:

 

Has an extension to the deadline been approved by the Assessor due to extenuating circumstances?

 

Assessor Declaration on Submission

I certify that the evidence submitted for this assignment is the learner’s own. If it is not their own work, then this is clearly explained and detailed in the feedback and comments above

Assessor Signature.

Date.

 

 

             


3. Learner to fill in on resubmission:

Task ref(s)

Evidence submitted

(e.g. written report, calculation, file name).

Task ref(s)

Evidence submitted

(e.g. written report, calculation, file name).

 

 

 

 

Additional learner comments to the assessor:

 

Learner Declaration on resubmission

I certify that the evidence submitted for this assignment is my own. I have clearly referenced any sources used in the work. I understand that false declaration is a form of malpractice.

Learner Signature.

Date.

 

 

           


4. Assessor to fill in on resubmission:

Task ref(s)

Assessor comment on task(s)

Task ref(s)

Assessor comment on task(s)

 

 

 

 

Resubmission feedback from the Assessor:

Does the learner need to attempt an assessment Retake? Y/N

 

Date of Retake:

 

Assessor Declaration on resubmission

I certify that the evidence submitted for this assignment is the learner’s own. If it is not their own work, then this is clearly explained and detailed in the feedback and comments above

Assessor Signature.

Date.

 

 

               

 

Sample Type:

(First or resubmission)

 

Samples IV Signature:

 

Date:

 


Assessment Tasks

Assessment grading instructions:

Tasks 1 to 3 are required for PASS (P) grade and must be attempted

Tasks 4 and 5 are also required for MERIT (M) grade (optional)

Work for Merit/Dist grades should also be supported by fully referenced evidence

Please carefully read your assessment instructions and add all your written work below the tasks. Remember to sign (not typed) the learner section of assessment record sheet above

TECOL uses a PLAGiaRISM Checker, so it is Important All answers must be your own worK

Tasks for Assessment 1

Task 1. (Criteria: P1)

  1. With the aid of block diagrams, and appropriate PLC applications, provide details of their specific requirements and why you selected ta specific PLC for the following
    1. A unitary PLC in a building
    2. A modular PLC in a factory
    3. A rack-mounted PLC in a factory

Checklist of evidence required: T1 – 600-800 word (total)  written report with appropriate diagrams. Note for 1b the PLC block diagrams must match the specific applications stated in 1a, so you need to draw these showing the types of I/Os required for each app.

Task 2. (Criteria: P2)

Explain, with the aid of diagrams and commercial examples, the architecture of a modern PLC system. Include in your answer reference to:

a) system hardware,

b) two software options (i.e. languages),

c) input / output interface including digital/analogue, range of voltage/current used,

d) field devices including examples popular devices

e) communication links including a commercial example.

Checklist of evidence required: T2 - 500 word written report with appropriate diagrams and examples

Task 3. (Criteria: P3)

The application above illustrates a simple stirring application in a lemonade factory.

a) Use LOGO to design and build the above system, using function block or ladder logic, which will control the operation as follows:

  • When the Start ‘push to make’ (not toggle) switch (I1) is pressed/released, and gets latched on (B1: RS latch), the start ‘fill’ pump (Q1) will be energized and the tank will start to fill.
  • The pulses generated by flow meter 1 (B5: pulse generator) should be used to increment the counter (B6: Up/down). Tank level full is when the counter function on = 10 and tank low level is when counter off = 1. These values can be used as feedback to control the pumps (instead of the high/low level sensors shown above) and can be called the ‘tank high/low level count indicator’ (Q5 or use a flag M1)
  • When the full liquid level in the tank is sensed by the tank high/low level count indicator (Q5), the fill pump will be shut-off and the FULL light (Q2) on the control panel is to be energized.
  • When the tank is full, start the mixer (Q3) and run for 10 seconds (B8: off-delay timer).
  • When the 10 seconds has expired, stop the mixer (Q3) and start ‘empty’ pump P3 (Q4).
  • Pump 3 (Q4) will be required to run until the tank is empty.
  • The pulses generated by flow meter 3 (B15) should be used to decrement the counter (B6: Up/down).  Tank empty can be detected by the high/low level count indicator (Q5 or use a flag M1) to switch off the pump
  • When the stop button (I2) is operated, the process must stop immediately (Q1, Q3, Q4).

b) Test your LOGO build and comment on your testing using LOGO simulation mode. This requires at least 3 print-screens of testing the system using the LOGO simulator below at the filling, mixing and emptying stages

c) Save your program and email a copy of your program along with your assessment.

Guidance: Clearly snip/print-screen and explain your build and test work. Use input/output (I/Q) numbers shown. Function numbers (B) can be your own choice, and you are also likely to need some basic logic functions (e.g. And/Or/Not) for the various conditions given in 3a.

Checklist of evidence required: T3 – (Snip) Image of program layout and test evidence, and a copy of PLC LOGO program file

Optional Merit/Distinction tasks are as follows:

Task 4 (Criteria: M1& M2)

A steel company requires a single custom built machine (see below) to do the following:

  • Batches of flat bars are to be trimmed to length and stacked
  • The bar comes along a roller track and hits an end stop.
  • The bar is clamped tightly.
  • An acetylene cutter moves to the cutting position for the batch.
  • The cutter cuts the length in a controlled manner and retracts.
  • The cut bar must be ejected and the process repeated.
  • All the actuators are hydraulic and controlled by electric solenoid valves, and they are fitted with position sensors to signal their movements.

You are to:

a) Draw a block diagram of your PLC interface to the machine in order to better understand the system

b) Select an appropriate PLC device and explain its benefits and limitations for this application

c) Select either the LLD or FBD program, and design a suitable program for the system

d) Explain your choice of program and each of the instructions/functions used.                                                                                                                   

Checklist of evidence required: 800 word written report with PLC input/output block diagrams, and (Snip) of appropriate supporting information/images

Task 5 (Criteria: D1)

Produce a report for the following:

According to IEC 61131-3 international standard, there are 5 programming languages to choose from when writing PLC control programs, two of which are textual and the other three are graphical: justifying your specific programming technique against the others. Include

i. Popularity and availability of users

ii. Program organisation and maintainability 

iii. Range of functions and complex applications

Guidance: This work may benefit from comparison tables where you can more easily discuss the advantage, disadvantages and how they compare.

Checklist of evidence required: T5 – 600 word written report with appropriate supporting illustrations and references

Task 6 (Criteria: D2)

Produce a report for the following:

For the industrial PLC applications in Task 4, create a table comparing the current capabilities and limitations of 2 commercial PLCs, from different suppliers, that could have been used including:

i. as processor power,

ii. memory capacity,

iii. I/Os available

iv. Future trends of PLCs from both suppliers

Guidance: This work may benefit from comparison tables where you can more easily discuss the advantage, disadvantages and how they compare.

Checklist of evidence required: T5 – 800 word written report with appropriate supporting illustrations and references

The END of Assessment brief


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