Description
PLC却认为闭合了多次，虽然硬件加了滤波电路，软件增加微分指令，但由于PLC扫描周期太短，仍可能在计数、累加、移位等指令中出错，出现错误控制结果；3)现场变送器，机械开关自身出故障，如触点接触不良，变送器反映现场
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