![]() ![]() The else statements are omitted on the second diagram, but they are implied. If the system is in the lights on state and 1 hour has passed, or an off pushbutton is pushed then the system will go to the lights off state. If motion is detected or an on push button is pushed the system will go to the lights on state. When the power is turned on the system will go into the lights off state. As shown in the figure this state diagram could be used for an automatic light controller. Likewise if the system is in state 2, and B happens the system will return to state 1. If the system is in state 1 and A happens the system will then go into state 2, otherwise it will remain in State 1. The diagram has two states, State 1 and State 2. The general sequence of states might be idle, scan card, get secret number, select transaction type, ask for amount of cash, count cash, deliver cash/return card, then idle.Ī State based system can be described with system states, and the transitions between those states. Implement the PLC program for this machine by using ladder diagram language. Consider a bank machine that will go through very carefully selected states. ![]()
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