In this edition of the newsletter that we will learn some basics, and hopefully introduce PLC shed light on some dark areas.
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Start with the good old days and how it was before. If you look at the drawing below shows the left side of a circuit wired to turn off a lamp on or off. What you see is the classic “Start / Stop Station. The lamp lights up when the START button is pressed and will continue until the STOP button is pressed.
Drawing on the right side is exactly the same as drawing on the left side, but it is drawn as a ladder. The scale drawing style was years ago many standards, because it is much easier to understand.
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Required in the good old days, many miles and miles of son and several relays to control all devices in an industrial plant. You can also see the tangle of cables. A few years ago (okay, 35), was invented by Modicon engineers a “machine” to eliminate all the necessary relays and associated wiring. The “machine” has been the PLC. (Allen Bradley PLC-5 shown here.)
How Does It Work
The PLC is like your home computer, but it has some extra parts.
The PLC has modules for input devices such as switches and output devices such as lamps are connected.A program written in a format scale is stored in the controller. This program contains instructions on what to do with output devices, what with the basic input.
Let us not in the program at this time. Everything you need to know is that the program just like the old style drawings of the head, “good old days” like.
How Its Done Now
We take the switch and the light of our original “good old days” in connection circuit for the invite to the API. Take a look below to see how connections are made.
Seems simple enough? The scale on the right is saved the program written in memory of the controller.
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Time To Compare
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Say that the two circuits side by side so you can compare. If both parties are the same?
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You’ve probably noticed that the relay “C” has been eliminated in the PLC configuration. It is not clear from the drawing, but a lot of money has also been eliminated.
Tag: plc
