From the flow signal generated by orifice to the display on flow totalizer, the multiple conversions of signals are dissected directly perceived through four quadrants signal conversiondiagram.
Through tree structure, the editor links the ladder diagram and PLC instruction to realize the compiler conversion between them.
编译器以树结构为中介将梯形图和PLC指令联系起来，实现了从梯形图到PLC指令的转换。
3
Based on reaction kinetics, the process flow diagram of continuous esterification and reaction conditions were set. The conversion of phthalic anhydride was over 99.8%.