What are block diagrams?
Block diagrams are used to represent the control system graphically. They are similar to a flowchart in that they represent the flow in an algorithm. Each block in the diagram represents a logical function in the system, including the controller, processes, actuators and sensors. All components are necessary, and a controller is essential in all block diagrams. • Rectangles enclose the controller and each process • Circles represent actuators and sensors • Arrows show the direction of the flow of data. Block diagrams should not look like a drawing of a series of toy cars on a road going in one way in linear fashion. It is a good idea to plan the drawing of a block diagram by first listing the components you have identified as necessary for the system you are describing. Draw the controller towards the centre of the page; arrange the processes around it, then place the sensors and actuators. When you joint the diagram with arrows in the direction of the flow of data, you will be checkin
