Much of that is because the test program is set up in a way that is pretty modular—with a constructor and init() method—so you can easily reuse this code for your own purposes without lots of changes.

主要是因为该测试程序按照非常模块化的方法编写 — 使用构造函数 init() 方法 — 以便不需要很大修改就能用于您自己的程序。

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Data processing, exchanger, charge calculation, charge receiving computer and program modular.

处理数据的过程，交换机，计费、收费计算机和程序模块。

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Furthermore, this paper gives detailed discussions on the control system, hardware configuration and software design, and provides the PLC modular diagram and the program design flow chart.

对系统的控制功能、硬件配置和软件设计进行了讨论，提供了PLC模块配置图，给出了程序设计流程。

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