Download PDF by Hugh Jack: Automating manufacturing systems with PLCs

By Hugh Jack

A detailed exam of producing keep an eye on structures utilizing dependent layout equipment. themes contain ladder common sense and different IEC 61131 criteria, wiring, communique, analog IO, based programming, and communications. Allen Bradley PLCs are used commonly in the course of the e-book, however the formal layout tools are appropriate to so much different PLC manufacturers. an entire model of the booklet and different fabrics can be found online at http://engineeronadisk.com

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Extra info for Automating manufacturing systems with PLCs

Example text

2 INPUTS AND OUTPUTS Inputs to, and outputs from, a PLC are necessary to monitor and control a process. Both inputs and outputs can be categorized into two basic types: logical or continuous. Consider the example of a light bulb. If it can only be turned on or off, it is logical control. If the light can be dimmed to different levels, it is continuous. Continuous values seem more intuitive, but logical values are preferred because they allow more certainty, and simplify control. As a result most controls applications (and PLCs) use logical inputs and outputs for most applications.

1. 1 An Example of Switched Sensors In the figure a NO contact switch is connected to input 01. A sensor with a relay output is also shown. The sensor must be powered separately, therefore the V+ and V- terminals are connected to the power supply. The output of the sensor will become active when a phenomenon has been detected. This means the internal switch (probably a relay) will be closed allowing current to flow and the positive voltage will be applied to input 06.

With this type of output card only one power supply can be used. 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.

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