底部是物理设备，提供了对网络的连接能力(串口或诸如以太网之类的高速网络)。
At the bottom are the physical devices that provide connectivity to the networks (serial or high-speed networks such as Ethernet).
然而，对于一些高速网络，如千兆位的以太网和万兆位的以太网，预期的往返时间(因此重新传输超时)要低得多。
However, with high-speed networks, such as Gigabit Ethernet and 10 Gigabit Ethernet, the round-trip time (hence retransmission timeout) is expected to be much lower.
该文介绍了如何通过以太网实现主机与PLC的高速网络通信，并给出在VC环境下具有报警功能的监控程序。
The paper introduces fast communication between the host and PLC by the Ethernet, and presents an application program with the function of alarm in the VC.
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