PC-A984-141
PC-A984-141
PC-A984-141
信息保护和恢复：当偶发性故障条件出现时，不破坏plc内部的信息，一旦故障条件消失，就可以恢复正常继续原来的工作。所以，plc在检测故障条件时，立即把现状态存入存储器，软件配合对存储器进行封闭，禁止对存储器的任何操作，以防存储器信息被冲掉，一旦检测到外界环境正常后，便可恢复到故障发生前的状态，继续原来的程序工作。
设置警戒时钟wdt：机械设备的动作时间一般是不变的，可以以这些时间为参考，当plc发出控制信号，相应的执行机械动作，同时启动一个定时器，定时器的设定值比正常情况下机械设备的动作时间长20%，若时间到，plc还没有收到执行机构动作结束信号，则启动报警。
提高输入信号的可靠性：由于电磁干扰、噪声、模拟信号误差等因素的影响，会引起输入信号的错误，引起程序判断失误，造成事故，例如按纽的抖动、继电器触点的瞬间跳动都会引起系统误动作，可以采用软件延时去抖。对于模拟信号误差的影响可采取对模拟信号连续采样三次，采样间隔根据a/d转换时间和该信号的变化频率而定，三个数据先后存放在不同的数据寄存器中，经比较后取中间值或平均值作为当前输入值。
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厦门泰尼电气有限公司
【产品质量】原装进口
【检测标准】按原厂标准
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