设计梯形图时以线圈为单位，分别考虑继电器电路图中每个线圈受到那些触点和电路的控制，然后画出相应的等效梯形图电路。
目前市场上的软PLC价格对于用户来说，性价比极高。这归根是2个主要优点
如今，许多过程自动化系统（包括许多安装在新工厂的系统）采用了大量的定制，并且饱受项目延误和成本超支带来的影响。他们与工厂**、生产计划管理等许多MOM应用的集成性也很差。其中的许多系统也受到人为阻碍，无法为有需要的人员和应用程序提供开放式的信息流。CPAS探讨了许多原则，如果遵循这些原则将有助于消除这些阻碍。
在上述几个部分中，通讯服务和程序扫描过程是PLC工作的主要部分，其工作周期称为扫描周期。可以看出扫描周期直接影响控制信号的实时性和正确性，为了确保控制能正确实时地进行，在每个扫描周期中，通讯任务的作业时间必须被控制在一定范围内。PLC运行正常时，程序扫描周期的长短与CPU的运算速度、与I/O点的情况、与用户应用程序的长短及编程情况等有关。通常用PLC执行lKB指令所需时间来说明其扫描速度，一般为零点几ms到上百ms。值得注意的是，不同指令其执行时间是不同的，从零点几μs到上百μs不等，故选用不同指令所用的扫描时间将会不同。而对于一些需要高速处理的信号，则需要特殊的软、硬件措施来处理。
系统技术文件包括说明书、电气原理图、电器布置图、电气元件明细表、PLC梯形图。
3．写入器的选择
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本公司专业销售全球**品牌备品备件
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