本文以Quantum 系列PLC 為研究對象，研究了其支持的通信協(xié)議。并且以Modbus 協(xié)議為應(yīng)用層協(xié)議，TCP 協(xié)議為傳輸層協(xié)議，IEEE802.3 為介質(zhì)訪問控制協(xié)議，結(jié)合VC++6.0 里的Winsock 網(wǎng)絡(luò)編程控件，編制了Modbus/TCP 通信程序，實現(xiàn)了Quantum 系列PLC 與監(jiān)控制站之間的以太網(wǎng)通信。該程序具有通信速度快，可靠性高的特點。
關(guān)鍵詞: 協(xié)議；Modbus 協(xié)議；TCP 協(xié)議；套接字； PLC
Abstract: This article introduces a kind of communication based on the Quantum series PLC. Using protocol of Modbus as protocol of application layer、 TCP as protocol of transport layer 、IEEE802.3 as protocol of MAC, through Winsock of VC++6.0 ,realize the Ethernet communication between Quantum PLC and monitor platform. The system that has this control system can become more speediness、economic and reliable in communication.
Keyword：protocol；Modbus protocol；TCP protocol；Socket；PLC