PLC HOMEWORK PROBLEMS BB-3(1).docx (Protected View) - Word Layout References Mai

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PLC HOMEWORK PROBLEMS BB-3(1).docx (Protected View) - Word Layout References Mailings Review View ell me what you want to do he Internet can contain viruses. Unless you need to edit, it's safer to stay in Protected View. Enable Editing A. PLC introduction HOMEWORK PROBLEMS 1. Give an example of where a PLC could be used. 2. Why would relays be used in place of PLCs? 3. Give a concise description of a PLC. 4. List the advantages of a PLC over relays 5. A PLC can effectively replace a number of components. Give examples and discuss some good bad applications of PLCs 6. Explain why ladder logic outputs are coils? 7. In the figure below, will the power for the output on the first rung normally be on or off? Would the output on the second rung normally be on or off? 8. Write the mnemonic program for the Ladder Logic belowr

Explanation / Answer

1) PLC can be used in bottle packing industry. Where when bottle comes to the desired place and get filled and then moved and then packed.

2) Relays can be used for simple design like On & OFF of machine(i.e, switching operation).

3) PLC stands for Programmable Logic Controller is a computer device used for controlling industrial operations. They are used in industries like oil refineries, conveyor etc.

4) Advantages of PLC over relays are

i) It can be interfaced with computer

ii) It is highly reliable

iii) It can work in extremely harsh conditions

iv) It's programming is very simple.

v) It's size is small.

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