From the course: Learning PLC Ladder Logic: 2 Diving Deeper

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Introduction to state diagrams

Introduction to state diagrams - Ladder Logic Tutorial

From the course: Learning PLC Ladder Logic: 2 Diving Deeper

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Introduction to state diagrams

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- [Instructor] A state diagram is a standardized method to visualize the sequence and defining sequential logic problems. Simply, where each step in a sequential process can be thought of as a state. Now, the way the state diagram is created is by having the states drawn as circles, and lines with arrows show the path from a state to another. Now, depending on how many states you have defined, the state diagram changes. In our example, we had four states, then we will have four circles, each representing a state. Most sequential processes repeat and hence we go back to the beginning state, where state diagrams usually have a defined starting point for each sequence. Now for numbering the sequence, there are two kinds of approaches. One, is to start with zero, the other one is start numbering from one, either one works. And we usually keep or reserve the first state to be the when where all outputs are off, a null state.…

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