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EXAMPLE LOGIC CIRCUITS - 2 | |
V. Ryan © 2003 - 2009 | |
PDF FILE - CLICK HERE FOR PRINTABLE VERSION OF EXERCISE BELOW |
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In manufacturing industry safe use of machines is very important. All machines should be set up in such a way that it is impossible for the machine operator to have an accident.
Machine ‘A’ is unsafe because it can be turned on and used when the guard is out of position, especially if it is operated by a machinist such as Ed the Handyman (website cartoon character). This means that the operator’s hands could be seriously injured by the dangerous blade as it cuts the material. |
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The animation below shows what happens when the
micro-switch has been switched 'ON' as the guard is in the correct
position. This means that the logic states of both inputs are
1 (true,
on, high,
up), consequently the output logic state is
1 (true,
on, high,
up) and the machine works. |
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QUESTION: Draw a series of logic circuits that clearly show the logic states of inputs and outputs as the guard is put in the correct position and the 'ON' switch pressed. |
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