Two-out-of-three safety input circuit of signal equipment

The utility model discloses a two-out-of-three safety input circuit of signal equipment. The system comprises an FPGA1, an FPGA2, an FPGA3 and an FPGA4, and the FPGA1, the FPGA2 and the FPGA3 are connected with corresponding VME buses of three main boards respectively and used for receiving and sending related I/O states and control information; the FPGA 4 is respectively connected with the FPGA 1, the FPGA 2 and the FPGA 3 through independent data lines, input sampling information is transmitted to an external MPU through the FPGA 1, the FPGA 2 and the FPGA 3, and voting of the input information is completed through the three MPU boards. The hardware and software architecture of the utility model can be applied to a two-out-of-three output board. The input principle can be applied to other safety-related double 2-vote-2 architectures; the input circuit adopts a standard VME bus and has the advantages of the standard VME bus. 本实用新型公开了一种信号设备的三取二安全输入电路，包括FPGA1、FPGA2、FPGA3和FPGA4，所述FPGA1、FPGA2和FPGA3分别与三块主板相应的VME总