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 1000/1120 KVA 13200 V PAD MOUNTED TRANSFORMER NEW ABB 2000 KVA 13,200-480 V PAD MOUNTED TRANSFORMER, NEW ABB iRB Robot 6400 M97 Long Reach 2.8 S4C No Reserves ABB K-line K3000S power air circuit breaker ITE GOULD BBC ABB K3000 KA Air Breaker LS ABB IRB 6000 Robot Used ABB IRB 6400 Robot complete w/cables and teach WOW ABB RAYMOND SHOT PEEN BLAST SYSTEM PORTABLE ON WHEELS 1000 KVA ABB USED TRANSFORMER ABB Robot S4C IRBKG Mens Diamond Arctica Watch ARDC-D3-B2ABb 9.75ct NEW ABB DCS-400 DCS401.0900 3ADT218361R0013--NEW IN BOX ABB K-line K2000S power air circuit breaker Nachi Robot, ABB Robot, Fanuc Robot, Welding robot ABB 15 VHK-500 Vacuum Circuit Breaker 2000 Amp ABB, BBC, ITE Med. 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