This paper targets at the problem that the logic of the 64D semi-automatic block system of the departing station cannot be normally reset when the operator first mistakenly presses the block button and then presses the reset button after the train arriving at the receiving station that is equipped with the fully-electronic computer based interlocking and provided with the 64D semi-automatic block system for the inter-station section.It compares and analyses the logic of the 64D relay-based semi-automatic block circuit and the processing logic for semi-automatic block of the fully-electronic 64D module for semi-automatic block,to identify the cause of the problem.An optimized treatment scheme of the fully-electronic 64D module for semi-automatic block is proposed to deal with the case where the block button and reset button are pressed at the same time,which is intended to solve the problem that normal reset cannot be achieved at the departing station when both command buttons pressed at the receiving station,and the proposed scheme is tested and verified.The test results show that the proposed scheme achieves the desired effect.
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