The hardware software and the work Principle of PLC contrl system of electrically heated air-dryer are introduced. The practice showed that the PLC control system is more effective and reliable.

• 介绍了电加热再生式气体干燥装置的PLC控制系统的软硬件组成和工作原理，实践表明用PLC控制可显著提高系统工作可靠性。