電感式接近開關的線不夠長你可以參考以下方法來解決： 
1，直接用同類型，同材質，同線徑的導線對接。 
2，使用中間端子對接，延長出線端電線長度。 
3，電感式接近開關一般是開關量信號，可以在中間加一個小的中間繼電器作為信號傳遞的“中轉站”。 

以上方法就可以解決你的問題，下面簡單普及一下關于電感式接近開關的幾點常識： 
1，電感式接近開關應用。 
一般電感式接近開關主要應用于對精度要求嚴格，響應速度快，靈敏度高的自動控制設備中，主要做限位，復位，自動保護，計數等作用。 
2，電感式接近開關的原理。 

3，電感式接近開關的工作方式。

四，電感式接近開關的使用注意事項： 
1，電感式接近開關一般只對金屬介質檢測，對非金屬多采用電容式接近開關。 
2，電感式接近開關一般輸出開關量信號，不輸出模擬量信號！ 
3，電感式接近開關直流輸出一般有二線制，三線制，四線制等，交流輸出主要為二線制，接線時要分清楚。

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