The design method and realization of measurement scale control system used to match material in chemical production was introduced. The configuration and LAD programming were based on the S7-300 PLC.

介绍在化工生产中加料用的计量秤控制系统的设计方法及在S7 - 300 PLC上进行组态、编程的实现过程。

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In order to control the pest, producers will have a variety of large-scale use of pesticides, especially the irrational use of chemical pesticides, greatly reducing the safety of vegetable products.

为控制病虫害，生产者将不得不大量使用各种农药，特别是化学农药的不合理使用，降低了蔬菜产品的安全性。

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The outcome from the workshop should help ensure consistently comparable quality control of selected chemical data collected on a global scale and over time.

UNESCO: NATURAL SCIENCES