Aim at the distinctness of design alteration procedure in current code and standard, put forward some opinion.

针对当前的法规、规章和规范中关于设计变更程序的不同之处提出一些看法。

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Explanation: Our company is being reserved the right to improve the product described in this handbook (specifications). And the alteration of its function design will not be notified later.

说明：本公司保留对本手册(说明书)中所描述的产品进行改进的权利，功能设计若变更，恕不另行通知。

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Based on the background of alteration to a large flowmeter calibrator in a certain factory, the design and realization of PLC control system were introduced.

基于对某厂大型流量校验器进行改造的背景，介绍了PLC控制系统的设计与实现。

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