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，最后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。
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ABB 3HAB 2214-1/1 DSQC 315 Module Combination I/O
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NEW ABB PRESSURE TRANSMITTER 264H 2600T
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ABB TA25DU SERIES THERMAL OVERLOAD RELAYS (15)
3HAA0001-ADY/1 ABB ROBOTICS
3HAA-0001-YR ABB ROBOTICS AXIS 5 CABLE
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ABB DSQC 236C Drive Unit YB560103-CC
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ABB DSMC110 57330001-N/2 FLOPPY DISC CONTROL MODULE NEW
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Allen Bradley AC Servo Motor 1326ABB515E21K5 2.44kw
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ABB GME PC Board DSQC 236G YB560103-CD/24 56M009G
