Download e-book for iPad: Automating manufacturing systems with PLCs by Hugh Jack

By Hugh Jack

ISBN-10: 0557344255

ISBN-13: 9780557344253

A detailed exam of producing regulate platforms utilizing established layout equipment. themes contain ladder common sense and different IEC 61131 criteria, wiring, conversation, analog IO, established programming, and communications. Allen Bradley PLCs are used commonly during the ebook, however the formal layout tools are appropriate to such a lot different PLC manufacturers. a whole model of the e-book and different fabrics can be found online at

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Extra resources for Automating manufacturing systems with PLCs

Example text

When an L output is energized the output will turn on indefinitely, even when the output coil is deenergized. The output can only be turned off using a U output. The last instruction is the IOT (Immediate OutpuT) that will allow outputs to be updated without having to wait for the ladder logic scan to be completed. When power is applied (on) the output x is activated for the left output, but turned off for the output on the right. 13 When the L coil is energized, x will be toggled on, it will stay on until the U coil is energized.

4 PRACTICE 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 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?

There is normally a loss of a couple of volts across the transistor. A triac is like two SCRs (or imagine transistors) connected together so that current can flow in both directions, which is good for AC current. One major difference for a triac is that if it has been switched on so that current flows, and then switched off, it will not turn off until the current stops flowing. This is fine with AC current because the current stops and reverses every 1/2 cycle, but this does not happen with DC current, and so the triac will remain on.

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Automating manufacturing systems with PLCs by Hugh Jack

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