Description
模拟量等输入信号的端口，其元器件质量的优劣、接线方式及是否牢靠也是影响控制系统可靠性的重要因素。以开关量输入为例，按钮、行程开关的触点接触要保持在良好状态，接线要牢固可靠。机械限位开关是容易产生故障的元件，设计时
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