施耐德系统TSXP572823M

施耐德系统TSXP572823M

施耐德系统TSXP572823M从考虑，重大部分不接入 PLC 的输入端，而做硬件处理。例如，紧急停车按钮、互锁触点、紧急限位开关、热继电器控制触点等，接至 PLC 的输出端子上，直接对输出负载(KM1、KM2)进行控制，以保证 PLC 故障时不损坏设备，不造成重大事故。

应保证有效输入信号的电平保持时间。要保证输入信号有效，输入信号的电平保持时间大于 PLC 一个扫描周期。除非对开关量输入信号设置允许脉冲捕捉功能，这样就允许 PLC 捕捉到持续时间很短的脉冲。

PLC 指令的执行条件有信号电平有效和跳变有效的区别，编程时应加以注意。

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