介绍了PLC内部数据寄存器和辅助继电器的分配，给出了部分程序指令。

The distribution of the data registers and auxiliary relays in the PLC is introduced, then some part of instructions are given.

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介绍了PLC在继电器控制系统改造中的应用，给出了I/O分配图及部分程序。

This paper introduces the application of PLC in reconstructing the relay control system and gives I/O distribution diagram and some of programs.

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对该系统接线及性能指标、数据构成与分配及内部辅助继电器分配进行了分析，并用这种模块组成一个数控系统，结果证明该系统能够满足预定的动。

Based on the analysis of system wiring criterion, data composition and assignment internal auxiliary relay assignment, a new NC system was made up by utilizing this model.

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