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

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Solution 1: Develop the state diagram

Solution 1: Develop the state diagram - Ladder Logic Tutorial

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

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Solution 1: Develop the state diagram

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- [Teacher] Let's develop the state diagram together. The first state is where everything is off. Now, in order to get out of the state we need to press on the start push button to start the conveyor. This will be the path to move from state zero to state one. Think about it this way, as an input in order to move to the next state, and for state one notice here I have one output that needs to be on. In state one only the conveyor is on. Now when the part reaches the middle of the conveyor a sensor detects a part, then the conveyor turns off, and a paint valve is turned on for three seconds. So I know that the sensor is the input that leads to the next state. In state two the outputs that are currently on are the paint valve and the timer for three seconds. Paint and timer are placed inside the circle as they are the outputs to be on during that state. No other output is on. The conveyor is off and hence we don't have it…

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