Electrical ladder drawings are still one of the common and reliable ... A key question to always ask yourself is: “What does it take to energize the output?” Here's a simple example to analyze. In Fig ...

A simple add instruction is shown in Rung 4 of the Fig. 1 ladder diagram program. Another group of arithmetic ... and as people in the electrical industry become more comfortable with computer ...

Many times there are also small numbers printed next to each of the electrical components on the diagram. In our example, we have colored these numbers blue. These smaller numbers represent the ...