GE DS3800NPRB1A1A
根据继电器电路图设计PLC的外部接线图和梯形图时应注意以下问题:
1) 应遵守梯形图语言中的语法规定。由于工作原理不同,梯形图不能照搬继电器电路中的某些处理方法。例如在继电器电路中,触点可以放在线圈的两侧,但是在梯形图中,线圈必须放在电路的最右边。
2) 适当的分离继电器电路图中的某些电路。设计继电器电路图时的一个基本原则是尽量减少图中使用的触点的个数,因为这意味着成本的节约,但是这往往会使某些线圈的控制电路交织在一起。在设计梯形图时首要的问题是设计的思路要清楚,设计出的梯形图容易阅读和理解,并不是告别在意是否多用几个触点,因为这不会增加硬作的成本,只是在输入程序时需要多花一点时间。
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