In the end of this paper, the writer probes into primary network control of PLC and design an industrial LAN, which suits for general little or medium sized enterprises. On the basis of the LAN. we can control several PLC through the network.

• 文末对PLC的网络控制进行了初步探讨，设计了一个适用于一般中小型企业的工业局域网络，并实现了对多台PLC的网络控制。