用VB实现的Client。实现S7—PLC和计算机通信。遵照OPC协议实现 -VB Client. Achieving S7-PLC and computer communications. OPC compliance with the agreement achieved

实现了opc通讯客户端与服务端的连接，经测试可以正常运行-The realization of the connection of OPC communication between the client and the server, the test can be normal operation