摘  要：本文利用VB软件开发虚拟控制对象，利用协议转换模块建立VB与PLC间 交互通信机制，从而实现PLC对虚拟控制对象的常规实验控制和程序验证，最终建立 一套完整虚拟仿真实验项目。 关键词：PLC  VB  虚拟控制对象 Abstract: Virtual control objects are designed by using the VB software in this paper. An interaction and communication mechanism between VB and PLC is established by using the protocol conversion module. The conventional experimental control and program verification c[登陆后可查看全文]