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Enginerring

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Challenging Minds Inspiring Success

Module/Unit title: PROGRAMMABLE LOGIC CONTROLLERS (Level 4)
Module/Unit Code: UNIT 22 A/601/1625
Module Lecturer: C Maton
Assignment title: 2 – Information and communication techniques.
| |Date issued: |
|Ass 1 |10th Oct 2015 |
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|Ass 3 |Date for submission: |
|Ass 4 |06th Nov 2015 |
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|P1.1 |Date submitted: |
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| |Assessor: |
| |Carl Maton |
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|P1.2 |Resubmission date if applicable |
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| |Word count : |
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|P1.3 |Internal Verifier: |
| |Peter Baker |
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|Date Due: | |
|9th Oct 2015 | |
|6th Nov 2015 | |
|04th Dec 2015 | |
|08th Jan 2016 | |
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In submitting this assignment I make the following declaration:

I understand that the piece of work submitted will be considered as the final and complete version of my assignment of which I am the sole author. I understand both the meaning and consequences of plagiarism and that my work has been appropriately attributed unless otherwise stated. I have not knowingly allowed another to copy my work.
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Assessment of Learning Outcomes
The following Learning Outcomes* are assessed in this assignment:-
|Learning Outcome 2 |Assessment Criteria for Pass |
| | |
| |To achieve each outcome a learner must demonstrate the ability to: |
|Understand programmable logic controller |Evaluate the different forms of signal used in programmable logic control. |
|information and communication techniques |Describe the resolution and relationship between analogue inputs and outputs and word length. |
| |Express numbers using different number systems. |
| |Describe typical protocols used in signal communication and evaluate networking methods and |
| |networking standards. |

*The Learning Outcomes for the module are specified in the BTEC Unit specifications.
Assignment Instructions

To achieve a pass you must: • Evaluate two types of signal used by PLCs (e.g. analogue (0-10 v dc, 4-20mA), digital). • Describe the resolution and relationship between analogue inputs and outputs and word length e.g. a digital shaft encoder needs to be accurate to at least 1 degree in 360. How many binary digits are required to achieve this? What is the ultimate accuracy? Digital shaft encoders use Gray codes rather than pure binary. Why is this necessary? Give a tabulated example of 3-bit Gray codes.

• Showing your working, express the following Hexadecimal numbers in Binary, Denary and Binary Coded Decimal: FA, F001, C2B, C7D. What can BCD numbers do that pure Binary or Hexadecimal numbers cannot?

• a) Describe typical protocols used in signal communication (e.g. Ethernet/IP, DeviceNet ). b) Evaluate networking methods and networking standards (e.g. master to slave; peer to peer; ISO; IEE; MAP).

For Merits M2 & M3:
M2 - a range of methods and techniques have been applied.
M3 - coherent, logical development of principles/concepts for the intended audience. Extend your answer to the pass criteria by explaining the terms quantisation, quantisation error and aliasing.

For Distinctions D2 & D3:
D2- autonomy/independence has been demonstrated.
D3- problems have been solved. Write a ladder logic program to control the temperature of the washing machine using an analogue temperature feedback signal from the machine that is to be compared with a desired analogue temperature signal from a variable adjustable control. The maximum signal is 10V dc and you may assume that 1V is equivalent to 10(C. Your program should include thorough comments/documentation throughout.…...

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