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By Hugh Jack

A detailed exam of producing keep watch over platforms utilizing established layout tools. issues contain ladder good judgment and different IEC 61131 criteria, wiring, verbal exchange, analog IO, dependent programming, and communications. Allen Bradley PLCs are used broadly throughout the ebook, however the formal layout equipment are appropriate to so much different PLC manufacturers. an entire model of the publication and different fabrics can be found online at

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A common choice when purchasing output cards is relays, transistors or triacs. Relays are the most flexible output devices. They are capable of switching both AC and DC outputs. But, they are slower (about 10ms switching is typical), they are bulkier, they cost more, and they will wear out after millions of cycles. Relay outputs are often called dry contacts. Transistors are limited to DC outputs, and Triacs are limited to AC outputs. Transistor and triac outputs are called switched outputs. - Dry contacts - a separate relay is dedicated to each output.

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. A PLC is a computer based controller that uses inputs to monitor a process, and uses outputs to control a processusing a program. 16 4. Less expensive for complex processes, debugging tools, reliable, flexible, easy to expend, etc.

If a NO start button is damaged the machine will not be able to start. 11. 25 12. 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 com + 24VDC - 7 com 13. + 24VDC - 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 com + 24Vdc - hot 220Vac neut. hot 120Vac neut. 26 14. 1 + com 24Vdc - 2 com 3 com 4 com 5 com 15. hot V 00 01 02 03 04 05 06 07 Load 1 Load 2 Load 3 120Vac neut. 27 16. relay output card + 00 power supply 24Vdc - 01 02 hot 03 power supply 120Vac neut. 9 ASSIGNMENT PROBLEMS 1. Describe what could happen if a normally closed start button was used on a system, and the wires to the button were cut.

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