SPC3调试工具内附VB源码程序，调试Profibus-DP总线的小软件，根据调试需要可以修改源码，完成所需功能。-SPC3 debugging tools included with VB source code program, debug Profibus-DP bus, a small software that can modify the source code under the debugger needs to complete the needed functionality

VB与西门子S7-200/300使用Profibus/ProfiNET通讯链接手册-VB and Siemens S7-200/300 use the Profibus/ProfiNET communication link manual