11/30/2023 0 Comments A plc ladder logic program consists of a number of rungs with each rung controlling an inputIn reality, the circuit looks something like this: ![]() ![]() The actual transformer or generator supplying power to this circuit is omitted for simplicity. These designations have nothing to do with inductors, just to make things confusing. L 1 is the "hot" conductor, and L 2 is the grounded ("neutral") conductor. The "L 1" and "L 2" designations refer to the two poles of a 120 VAC supply, unless otherwise noted. If we wanted to draw a simple ladder diagram showing a lamp that is controlled by a hand switch, it would look like this: They are called "ladder" diagrams because they resemble a ladder, with two vertical rails (supply power) and as many "rungs" (horizontal lines) as there are control circuits to represent. ![]() Ladder diagrams are specialized schematics commonly used to document industrial control logic systems. Lessons In Electric Circuits - Volume IV Chapter 6 LADDER LOGIC Lessons In Electric Circuits - Volume IV (Digital) - Chapter 6
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