在PLC发展的初期，沿用了设计继电器电路图的方法来设计梯形图程序，即在已有的些典型梯形图的基础上，根据被控对象对控制的要求，不断地修改和完善梯形图。有时需要多次反复地调试和修改梯形图，不断地增加中间编程元件和触点，才能得到一个较为满意的结果。这种方法没有普遍的规律可以遵循，设计所用的时间、设计的质量与编程者的经验有很大的关系，所以有人把这种设计方法称为经验设计法。它可以用于逻辑关系较简单的梯形图程序设计。 用经验设计法设计PLC程序时大致可以按下面几步来进行：分析控制要求、选择控制原则；设计主令元件和检测元件，确定输入输出设备；设计执行元件的控制程序；检查修改和完善程序。 产品广泛应用领域： ●电力行业 ●电力-电厂输煤程控系统 ●电力-电气化水系统 ●电力-除灰除渣系统 ●化工-盐化厂 ●冶金-炼铁高炉系统 ●水利-水电厂监控系统 ●汽车制造行业 ●钢铁及锅炉行业 ●供水及水处理行业 ●造纸及印刷行业 ●玻璃生产及加工行业 ●电站及小水电控制行业 ●水泥制品及生产制造行业 ●铁路运输装卸行业 ●我们售出的产品都经过的测试和，且质保一年，15天内包退换，满意后付款!!! ●我们的宗旨是：“用服务与真诚来换取你的信任与支持， ●互惠互利，共创双赢！”我公司愿与国内外各界同仁志士 ●竭诚合作，共创未来！ ABB ACH550-VDR-08A8-4 ACH550 5HP VFD DRIVE NIB! ABB MODEL E-32215 APMXB03 CARD MODULE NEW ABB ACS HP, 460V drive, P/N ACS ABB Inverter DGV300FP03 NEW Free Ship ABBA 600V S7H CIRCUIT BREAKER K7TK. 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