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The input and output equipments of metro signaling system is a interface between logic equipments and field equipments. They require four high requirements (high safety, high reliability, high maintainability ,high availability ) Traditionally signaling factory design all signal system, With the development of computer technology, Now logic parts may adopts COTS products, but input and output parts are designed by signaling factory themselves. So it is a development direction for design a general input and output products for metro.In order to meets above requirements .This discourse is based on real application, The signal products will open and transparent, Design a general intelligent I/O for metro based on ARM, It is convenience interface to field equipments.We adopts redundancy design in hardware, adopt ARM is main processor, no single hardware fault, Input parts adopts dynamic XOR design, drive parts adopts safety design.Safety intelligent I/O based on ARM for metro meets European standards for railway, so the products will have high safety, high reliability, high maintainability, high availability.The discourse mainly introduce safety intelligent I/O based on ARM, include design, realize, design idea, hardware and software and so on.
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