您可以将在一个会话中生成的图形以及所采取的步骤都保存下来以备后用，这对于重新获得上次退出时的工作环境(每一个项目的)来说尤其实用。
You can save both the generated graphics and the steps taken during a session for later use, which is especially useful in picking up working environments, per project, where you last left off.
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。
Through the serial communication with PLC in VB, the computer read the fault data stored in the PLC and display in figure.
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