描述
PLC对模拟量信号的识别是通过PLC的模拟量输入输出模块来完成的。模拟量输入输出模块采用A/D转换原理,输入端接收来自传感器或变送器的模拟信号,输出端输出的模拟信号作用于PLC的控制对象。PLC诊断模拟量故障的过程,实质就是将在相应A/D通道读到的监测信号的模拟量的实际值与系统允许的极限值相比较的过程。如果比较的结果是实际值远离极限值,则表明轧钢生产设备对应的受监控部位处于正常状态,如果实际值接近或达到极限值,则为不正常状态。判断故障发生与否的极限值根据实际系统相应的参数变化范围确定,利用PLC上的模拟量设定开关可精确设置该极限值。
当模拟量的实际值达到模拟量设定开关的设定值,PLC还能按照一定的逻辑关系启动开关量模块上的输出位,或者从PLC的通讯口主动发起通讯,从而输出故障诊断的结果,并据此实现对轧钢生产设备的控制。
2.3基于中断方式的故障诊断
PLC的中断方式有:
(1)输入中断;
(2)间隔定时器中断;
(3)高速计数器中断。其中,输入中断特别适合于轧钢生产设备的故障诊断。它对应于工业操作站的硬中断,属于外部中断,但PLC的输入中断可用PLC的外部指令来屏蔽。将轧钢生产设备的故障信号作为PLC的输入中断源,一旦出现故障信号,CPU立即响应,停止正在执行的程序,转到中断子程序中去,即可方便地对故障进行处理。它与直接利用PLC的内部逻辑完成故障诊断的不同之处在于:采用输入中断处理故障时,可停止PLC主程序的执行过程,而直接利用PLC的输入和内部逻辑处理故障时,PLC的主程序仍处于运行状态。因此,要根据故障对轧钢生产设备的影响程度选择合适的故障诊断方式。PLC的输入中断方式对后果严重的突发故障的处理特别有用。3PLC在故障诊断系统中的作用
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