By J. E. Rubio

ISBN-10: 0719018412

ISBN-13: 9780719018411

Publication by way of Rubio, J. E.

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Additional resources for Control and Optimization: The Linear Treatment of Nonlinear Problems

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DC voltages can be connected to larger variety of electrical systems. • AC signals are more immune to noise than DC, so they are suited to long distances, and noisy (magnetic) environments. • AC power is easier and less expensive to supply to equipment. • AC signals are very common in many existing automation devices. ASIDE: PLC inputs must convert a variety of logic levels to the 5Vdc logic levels used on the data bus. This can be done with circuits similar to those shown below. Basically the circuits condition the input to drive an optocoupler.

We can also use relay outputs to switch the outputs. 7 for relay output. ) When an output is activated the output switches on and power is delivered to the output devices. 5. When using relay outputs it is possible to have each output isolated from the next. A relay output card could have AC and DC outputs beside each other. 3 RELAYS Although relays are rarely used for control logic, they are still essential for switching large power loads. Some important terminology for relays is given below. Contactor - Special relays for switching large current loads.

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. 5 PRACTICE PROBLEM SOLUTIONS 1. To control a conveyor system 2. For simple designs 3.

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Control and Optimization: The Linear Treatment of Nonlinear Problems by J. E. Rubio

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