季总，谢谢解答！我查了HELP，SMB31 writer control byte和SMW32  address of v area

You can save a value stored in V memory to permanent memory (EEPROM) under the control of your program. To do this, load the address of the location to be saved in SMW32. Then, load SMB31 with the command to save the value. Once you have loaded the command to save the value, you do not change the value in V memory until the CPU resets SM31.7, indicating that the save operation is complete. 
At the end of each scan, the CPU checks to see if a command to save a value to permanent memory was issued. If a command was issued, the specified value is saved to permanent memory.

Save_to_EEPROM SMB31 Setup save parameters for saving a value stored in V memory to permanent memory (EEPROM)
Save_to_EEPROM_7 SM31.7 User Request to execute permanent memory save operation (0=no request, 1=save)
The CPU resets this bit after every save operation
Save_Address SMW32 Stores the address of the V memory location to be saved

我的理解是：将SM31.7设定1，SMW32存储的V地址中的数据导入到EEPROM中，而且该地址的值不能改变，直到SM31.7reset

如果是HMI上使用的V区域变量（例如VW1000），如何将这些变量保存的EEPROM，当我再次上载的时候VW1000是否在DB BLOCK中，谢谢！