PLC Ladder Diagrams for Electrical Engineers As an introduction to ladder diagrams, consider the simple wiring diagram for an electrical circuit in Figure 1a. The diagram shows the circuit for switching on or off an electric motor. We can redraw this diagram in a different way, using two vertical lines to represent the input power rails and stringing the rest of the circuit between them. Quiz & Worksheet - Electrical Schematic Symbols | Study About This Quiz & Worksheet. Use this quiz and worksheet to assess your understanding of electrical schematic symbols. To pass the assessment you have to be familiar with these symbols and other Electrical Final Exam ( Test and Homework ) Flashcards Start studying Electrical Final Exam ( Test and Homework ). Learn vocabulary, terms, and more with flashcards, games, and other study tools. Ladder diagrams and the PLC for electrical engineers Figure 2 – PLC implementation of Figure 1. As you will see later, each instruction is represented inside the PLC by a reference address, an alphanumeric value by which each device is known in the PLC program example, the push button PB1 is represented inside the PLC by the name PB1 (indicated on top of the instruction symbol) and likewise for the other devices shown in Figure 2.
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