P0961EF CP30B
P0961EF CP30B
P0961EF CP30B
在实际应用之中，工具情况还以延长采样的次数，以达到较好的效果。提高读入PLC现场信号的可靠性还可利用控制系统自身特点，利用信号之间关系来判断信号的可信程度。如进行液位控制，由于储罐的尺寸是已知的，进液或出液的阀门开度和压力是已知的，在一定时间里罐内液体变化高度大约在什么范围是知道的，如果这时液位计送给PLC的数据和估算液位高度相差较大，判断可能是液位计故障，通过故障报警系统通知操作人员检查该液位计。
又如各储罐有上下液位极限保护，当开关动作时发出信号给PLC，这个信号是否真实可靠，在程序设计时我们将这信号和该罐液位计信号对比，如果液位计读数也在极限位置，说明该信号是真实的；如果液位计读数不在极限位置，判断可能是液位极限开关故障或传送信号线路故障，同样通过报警系统通知操作人员处理该故障。由于在程序设计时采用了上述方法，大大提高了输入信号的可靠。
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