By Hugh Jack

A close exam of producing keep an eye on structures utilizing established layout equipment. themes comprise ladder good judgment and different IEC 61131 criteria, wiring, verbal exchange, analog IO, dependent programming, and communications. Allen Bradley PLCs are used commonly during the publication, however the formal layout tools are appropriate to so much different PLC manufacturers. an entire model of the e-book and different fabrics can be found online at

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Programming can be done with ladder logic, mnemonics, SFCs, and structured text. • There are multiple ways to write a PLC program. 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?

In a full PLC implementation there will be many circuits that must each be complete. A second important concept is the common. Here the neutral on the power supply is the common, or reference voltage. In effect we have chosen this to be our 0V reference, and all other voltages are measured relative to it. If we had a second power supply, we would also need to connect the neutral so that both neutrals would be connected to the same common. Often common and ground will be confused. The common is a reference, or datum voltage that is used for 0V, but the ground is used to prevent shocks and damage to equipment.

For electrical engineers) Explain the operation of AC input and output conditioning circuits. 9. What will happen if a DC output is switched by an AC output. 10. Explain why a stop button must be normally closed and a start button must be normally open. 11. For the circuit shown in the figure below, list the input and output addresses for the PLC. 22 program. 200 201 A 100 202 101 203 204 solenoid valve 205 206 207 com 102 103 104 + 24VDC B C 105 106 107 + 12VDC com 12. We have a PLC rack with a 24 VDC input card in slot 3, and a 120VAC output card in slot 2.

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