Indicator lamps, solenoid valves, and motor starters (assemblies consisting of contactors and overload protection devices) are all examples of discrete control devices. In a manner similar to discrete inputs, a PLC connects to any number of different discrete final control devices through a discrete...
We will use switches and a light bulb to give simple examples of an application interfacing to those PLC Inputs and Outputs. And we will introduce symbols that denote common examples of those PLC instructions.Understanding a Basic Switch, a Light Bulb and Digital I/O Let’s first consider ...
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Examples of discrete output devices are lights, relays and motor starters. From our dishwasher example inPart 1, some of the discrete inputs would the start button, the door switch and the water level switch. Some of the discrete outputs would be the water fill valve, the water drain ...
Using only digital signals, the PLC has two digital inputs from float switches (tank empty and tank full). The PLC uses a digital output to open and close the inlet valve into the tank. When the water level drops enough so that the tank empty float switch is off (down), the PLC ...
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PLC Multiple Outputs Configuration PLC Program Examples Equivalent Logic Gates & PLC Ladder Diagrams PLC Input/Output Cards Learn about the PLC hardware components and their related theory. PLC Input/Output Modules PLC Digital Input and Output Modules ...
What precautions are important when wiring inputs and outputs to a PLC? Key wiring precautions include: Separating AC power wires from DC I/O wiring Properly grounding the PLC and field devices Using shielded, twisted pair cables for analog signals ...
22、esehavebetween8and12digitalinputs,4and8digitaloutputs,andupto2analoginputs.Sizeisusuallyabout4"wide,3"high,and3"deep.MostsuchdevicesincludeatinypostagestampsizedLCDscreenforviewingsimplifiedladderlogic(onlyaverysmallportionoftheprogrambeingvisibleatagiventime)andstatusofI/Opoints,andt 23、ypicallythese...
It is useful when there are a large number of inputs and outputs. We can add more input and outputs by adding the modules in the PLC. It also has more memory and capability to store information. The example includes control processing lines in the manufacturing industry. Let's have a ...