西门子模块6ES7315-2EH14-0AB0

6ES7315-2EH14-0AB0

该梯形图中停车信号X0使用的是常开触点串联在控制线路中，这是因为外部停车设备选取按钮常闭触点所致，不操作该按钮，则输出Y0正常接通，若按下该按钮，输出Y0断电。

若希望编制出符合我们平时阅读习惯的梯形图程序，则在选用外部停车设备时需使用按钮SB0的常开触点与X0相连。

梯形图程序更加符合我们的阅读习惯，也更易分析其逻辑控制功能，因此在PLC构成控制系统中，外部开关、按钮无论用于起动还是停车，一般都选用常开型，这是一个在使用PLC时需要格外注意的问题。

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