They are:
Two State (On/Off): It can only be in one of two states - on or off and nothing in between. An example of this is a domestic heating system. The boiler is either on or off depending on the room temperature.
Continuous: Is constantly monitoring the inputs and constantly controlling the outputs. A change in the input leads directly to a change in the output. An example is a burglar alarm which is constantly sensing for motion.
Sequential: Carries out a series of events in order, one after the other. The end of one event signals the start of the next event. The outputs are being controlled constantly. An example of this is a car manufacturing plant - conveyor belt assembly.
No comments:
Post a Comment