Clear variable constants:Graphic symbols are equivalent to opcodes,specifying operation functions,and operands are filled by users,such as:K400,T120,etc.Variables and constants in PLC and their value ranges are
It is clearly stipulated that it is determined by the product model,and the product catalog manual can be consulted.
明确的变量常数：图形符相当于操作码，规定了运算功能，操作数由用户填人，如：K400，T120等。PLC中的变量和常数以及其取值范围有
明确规定，由产品型号决定，可查阅产品目录手册。
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