Through the serial communication with PLC in VB, the computer read the fault data stored in the PLC and display in figure.
在VB环境下实现计算机与PLC的串行通讯，读取PLC中保存的故障数据并用图形显示出来。
The main description is on designs such as overall scheme, control program, communication interface between PLC and upper computer, data read program.
本文介绍了立体车库的PLC控制系统总体设计、控制程序设计、PLC与上位机接口的通信方案设计、计算机从PLC读取数据的程序设计等。
What is more, architecture and communication is analyzed and OPC client is designed to read data from OPC server local or remote.
分析了OPC的体系结构和通讯方式，设计了OPC客户端，使其能够读取本地或者远程的OPC服务器；
What is more, architecture and communication is analyzed and OPC client is designed to read data from OPC server local or remote.
分析了OPC的体系结构和通讯方式，设计了OPC客户端，使其能够读取本地或者远程的OPC服务器；
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