检测对程序或功能块局部变量的外部访问
理由：CODESYS 允许从外部读取程序或功能块的局部变量。这违背了数据封装（隐藏数据）原则，也不符合 IEC 61131-3 标准。
重要性：中型
示例
PROGRAM PLC_PRG VAR iCounter : INT; afb_Instance : AFB; bfb_Instance : BFB; END_VAR iCounter := A_PRG.iLocal; // SA0102 iCounter := bfb_Instance.iLocal; // SA0102 A_PRG(); FUNCTION_BLOCK AFB VAR_INPUT END_VAR VAR_OUTPUT END_VAR VAR iLocal: INT; END_VAR METHOD METH : INT VAR_INPUT END_VAR iLocal := iLocal + 1; FUNCTION_BLOCK BFB EXTENDS AFB VAR_INPUT END_VAR VAR_OUTPUT END_VAR VAR END_VAR METHOD METH : INT VAR_INPUT END_VAR iLocal := iLocal + 1; PROGRAM A_PRG VAR iLocal: INT; END_VAR iLocal := iLocal + 1; --> SA0102: Access to program/fb variable 'iLocal' from the outside