最近发现step7 软件突然 不能访问背景数据块的内容了,如下图所示
点击帮助 如下:Help on Message 34:4487
Description of Error:
You are using symbolic data block access. In the symbol table, the data block being used is declared as an instance data block for an FB or an SFB. In the available Compile Option, such "cross access" is not permitted because the (S)FB considers the data to be its own local data.
To Correct or Avoid Error:
Change your access or turn off the option that forbids cross access in instance data blocks.
提示到是清除,但是turn off the option that forbids cross access in instance data blocks.如何操作呢 ? 大家多指教啊