PLC系统可靠性与其硬件和软件的可靠性相关。实践表明,本文措施能够在硬件配置上提高系统对外界环境的抗干扰能力,在软件设计上提高对不同的工艺、设备情况做出准确及合理判断的能力,使产品具备较多的适用范围和竞争力。 PLC system reliability is related to the reliability of its hardware and software. Practice shows that the measures in this paper can improve the anti-interference ability of the system to the external environment on the hardware configuration and improve the ability to make accurate and reasonable judgment on different process and equipment conditions in the software design so that the product has more applicable scopes and Competitiveness.