Download Automating manufacturing systems with PLCs by Hugh Jack PDF

By Hugh Jack

A close exam of producing keep watch over platforms utilizing based layout equipment. subject matters contain ladder good judgment and different IEC 61131 criteria, wiring, communique, analog IO, dependent programming, and communications. Allen Bradley PLCs are used widely in the course of the publication, however the formal layout tools are appropriate to such a lot different PLC manufacturers. an entire model of the booklet and different fabrics can be found online at

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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 and 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 below.

If the stop button is damaged, say by a wire falling off, the power will also be lost and the system will shut down - safely. If the stop button used was normally open and this happened the system would continue to operate while the stop button was unable to shut down the power. Now consider the start button. If the button was damaged, say a wire was disconnected, it would be unable to start the system, thus leaving the system unstarted and safe. In summary, all buttons that stop a system should be normally closed, while all buttons that start a system should be normally open.

Rack - A rack is often large (up to 18” by 30” by 10”) and can hold multiple cards. When necessary, multiple racks can be connected together. These tend to be the highest cost, but also the most flexible and easy to maintain. Mini - These are similar in function to PLC racks, but about half the size. Shoebox - A compact, all-in-one unit (about the size of a shoebox) that has limited expansion capabilities. Lower cost, and compactness make these ideal for small applications. Micro - These units can be as small as a deck of cards.

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