KJ3003X1-EA1 12P0921X042 EMERSON

EMERSON KJ4001X1-CH1 12P1811X032
EMERSON KJ4001X1-CG1 12P1812X042
EMERSON KJ4001X1-CC1 12P0733X042
EMERSON KJ4001X1-CA1 12P0623X062

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这两个控制线路的控制功能完全一样,按下起动按钮,输出动作;按下停止按钮,输出断开;但它们的可靠性不一样。我们假设输出断开为安全状态,那么图3的可靠性要比图2的高。这是因为SB1SB2都有发生故障的可能,而最常见的现象是输入电路开路。当采用图3电路时

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