这儿有一些你需要理解的编辑一个控制启停顺序逻辑的程序设计基础。我将调用我的那些主控位，对于启动按钮我也会定义。那些主控位用于逻辑中的任何地方，来防止自动化过程的再次启动和他们已经完成时的监测
2限度地满足被控对象的控制要求。
TB1-AB28AB
XWT-ID16-1
自动启动时，按照逆煤流方向顺序启动设备；自动停机时，按照顺煤流方向延时停止设备；当某一设备出现事故跳闸时，由故障设备开始进行逆煤流跳闸（除铁器、电子皮带秤、取样器不参与跳闸）。并且本系统允许有多个流程在运行中，但不允许同时操作两个及以上流程启动或停机。当有两条流程在运行时，如果其中一条流程的某一设备出现故障造成此流程设备联跳时，不能影响另一条正在正常工作的流程。具体设备的位置和流程顺序参看系统总貌
可编程控制器技术主要是应用于自动化控制工程中，如何综合地运用前面学过知识点，根据实际工程要求合理组合成控制系统，在此介绍组成可编程控制器控制系统的一般方法。
在国内公司开展PLC业务的初几年，PLC产品线不完善，产品的品种较少，不利于全方位的市场开拓。
当向PLC基本单元供电时，基本单元表面上设置的［POWER］LED指示灯会亮。如果电源合上但［POWER］LED指示灯不亮，请确认电源接线。另外，若同一电源有驱动传感器等时，请确认有无负载短路或过电流。若不是上述原因，则可能是PLC内混入导电性异物或其他异常情况，使基本单元内的保险丝熔断，此时可通过更换保险丝来解决。
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