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According to output control signals and feedback input test signal, the traffic signal controller can realize self-diagnosable function. 信號(hào)控制機(jī)能根據(jù)輸出控制信號(hào)與反餽輸入檢測(cè)信號(hào)，實(shí)現(xiàn)信號(hào)控制機(jī)的自診斷功能。