1拟定控制系统设计的技术条件。技术条件一般以设计任务书的形式来确定，它是整个设计的依据；
如果进行了全部的检查之后，［EPROR］LED的灯亮状态仍不能解除，，应考虑PLC内部发生了某种故障，请与厂商联系。
C2000-MR141-V2
6ES5-304-3UB11
这种编程形式在很多情况中可以见到。不过经常地，使用都略有不同。在某一场合中，一台机器可能被起动;在另一场合中，一个排气扇可能在循环与排气间转换。不同情况下，问题的初始表现并不能让人想起相同的解决方法。
软件设计包括系统初始化程序、主程序、子程序、中断程序、故障应急措施和辅助程序的设计，小型开关量控制一般只有主程序。首先应根据总体要求和控制系统的具体情况，确定程序的基本结构，画出控制流程图或功能流程图，简单的可以用经验法设计，复杂的系统一般用顺序控制设计法设计。
S7-200系列可编程控制器有直流24V输出接线端，该接线端可为输入传感器（如光电开关或接近开关）提供直流24V电源。
3.4逻辑完善
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