隨著可編程控制器技術的不斷發展，其應用領域也在不斷的擴大。各種PLC 及其組態軟件也應運而生。但為了降低成本，對于在小型的對象上的運用，一般可以使用一些自編的通訊軟件和監控界面，實現對工藝對象的自動控制。文章以水處理中某段裝置的控制工藝為實例，敘述了通訊實現的編制過程。
關鍵詞：通信，PLC，自動控制，水處理，VB
Abstract: PLC technology, which has been adopted in more and more fields, has achieved increasing improvement, resulting in the appearance of various types of PLC and its team software. In order to reduce the cost, automatic control can be realized in small-sized technological designs by adopting some self-programmed communication software and monitoring screen By taking the water treatment control in some device in technological designs as example, the thesis relates the programming procedure through communication software.
Key words：communication；PLC；automatic control；water treatment；VB；