Patent ID: 6639782
Filing Date: 2003-10-28
Classification: G05B,H01L

Abstract:
A protecting circuit adaptable to an automatic transport apparatus having a standardized mechanical interface, said protecting circuit comprising:a first output terminal for providing a first signal from a semiconductor process apparatus, indicating that at least a semiconductor object is placed on a supporting device of the semiconductor process apparatus; a second output terminal for providing a second signal from the semiconductor process apparatus, indicating that the supporting device is in a predefined fit position; a first sub-circuit coupled to receive said first signal and said second signal for generating a first output signal only when said first signal and said second signal are both inactive, wherein said generated first output signal is connected to the standardized mechanical interface, thereby denoting a status during which a loading is performed by the automatic transport apparatus; and a second sub-circuit coupled to receive said first signal and said second signal for generating a second output signal only when said first signal is active and said second signal is inactive, wherein said generated second output signal is connected to the standardized mechanical interface, thereby denoting a status during which an unloading is performed by the automatic transport apparatus.