将线圈供电接上上端控制输出。常开/常闭触点接下位阀门，开关。
接近开关--中间继电器--电磁阀接电：
常开的接法
24+， 接接近开关+，一路
24-， 接接近开关-，并继电器-（14），二路
接近开关控制线接继电器+ （13），三路
继电器常开并接触器13，14，4路

常闭的接法：
1，2，3路同上
继电器常闭串联在接触器13前面或14后面，4路

PS：其实，如果仅仅是控制一个电磁阀的话，建议直接旋钮控制吧

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