The OP010 Siemens Membrane Keypad is designed to be used with Siemens operator panels, such as the OP7, OP17, and MP277, and is commonly used in a range of industrial applications. This consists of a thin, flexible membrane that is printed with symbols or letters and is mounted on a rigid backing board. When a key is pressed, the OP010 Siemens Membrane Keypad flexes, making contact with a conductive pad on the backing board, which sends a signal to the operator panel.