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.
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 system can implement the switch the image, record video and display thee-map function with alarm linkage.
系统可进行报警联动切换图像、报警联动录像、报警电子地图显示等功能。
The paper designs an automatic alarm with the time delay function which composed by the microwave launcher, 555 timers, the voltage comparator and the relay.
设计了一个由微波发射器、555定时器、电压比较器和继电器组成的具有延时功能的自动报警器。
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