Designing Ladder Diagrams for Automotive Safety Systems
A ladder diagram is a type of graphical programming language used to develop control systems. It is often used in the field of automation and robotics to program a logic-based control system, such as a car door/safety belt system. In this case, the goal is to design a ladder diagram that will cause output Y to go HIGH when switch A and B are closed OR when switch C is closed. To do so, we must first start with the Boolean equation. This equation can be written as: Y = A*B + C (Ghahramani, 2019). The ladder diagram will consist of two input contacts (A and B) and one output contact (Y). When A and B are both closed, the current will flow from the input contact on the left side of the diagram to the output contact on the right (Salomon, 2020). This will cause output Y to go HIGH. In the same vein, when C is closed, current will flow from the input contact on the left side to the output contact on the right, causing Y to go HIGH. In the case of the new Ford truck door/safety belt system, the ladder diagram will be slightly more complex. The goal is to ensure that the truck will not start when the door is open and the seat belt is not clicked in. To accomplish this, the ladder diagram must contain two inputs (the door and the seat belt) and one output (the ignition). When the door is open and the seat belt is not clicked in, the current will not flow from the input contacts to the output contact, and the key will not start the ignition. However, if the door is closed and the seat belt is clicked in, current will flow from the. Cont…
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