By Hugh Jack

ISBN-10: 0557344255

ISBN-13: 9780557344253

A close exam of producing keep watch over structures utilizing established layout tools. subject matters contain ladder common sense and different IEC 61131 criteria, wiring, verbal exchange, analog IO, established programming, and communications.Allen Bradley PLCs are used broadly throughout the e-book, however the formal layout equipment are appropriate to so much different PLC brands.A complete model of the publication and different fabrics can be found online at

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Hence, we will discuss logical I/O and leave continuous I/O for later. Outputs to actuators allow a PLC to cause something to happen in a process. A short list of popular actuators is given below in order of relative popularity. Solenoid Valves - logical outputs that can switch a hydraulic or pneumatic flow. Lights - logical outputs that can often be powered directly from PLC output boards. Motor Starters - motors often draw a large amount of current when started, so they require motor starters, which are basically large relays.

Both of the switches are powered by the hot output of the 24Vac power supply - this is like the positive terminal on a DC supply. Power is supplied to the left side of both of the switches. When the switches are open there is no voltage passed to the input card. If either of the switches are closed power will be supplied to the input card. In this case inputs 1 and 3 are used - notice that the inputs start at 0. The input card compares these voltages to the common. If the input voltage is within a given tolerance range the inputs will switch on.

This becomes a major problem with large relays. On relays switching AC this problem can be overcome by opening the relay when the voltage goes to zero (while crossing between negative and positive). When switching DC loads this problem can be minimized by blowing pressurized gas across during opening to suppress the arc formation. AC coils - If a normal relay coil is driven by AC power the contacts will vibrate open and closed at the frequency of the AC power. This problem is overcome by adding a shading pole to the relay.

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Automating Manufacturing Systems with Plcs by Hugh Jack

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