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S7200的PLC对接近开关的控制问题

2025-04-08 07:41:10

推荐回答（2个）

回答1：

PLC一组端口中只有一个公共端，要么同为高电平有效，要么同为低电平有效。
而NPN开关输出的是低电平。PNP输出的是高电平。正好相反。
你接NPN为主时，PNP加下拉电阻。
你接PNP为主时，NPN加上拉电阻。

回答2：

你是说多个接近开关并联在一个输入点上么？

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