This Start Stop Ladder Diagram depicts the start-stop circuit in ladder logic programming. This pattern is similar to the State Coil and is an extension of the Sealed in a Coil pattern. Start/Stop control stations are the most practical way to provide simple local control for various applications. When incorporated into a control scheme, they provide a local interface that can easily control machinery. Motor controllers, as depicted in this Start Stop Ladder Diagram, are devices that regulate the speed of an electric motor. Motor controllers are devices that work with switchboards or variable frequency drives to control the prime mover process in artificial lift applications.