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  1. Hello, The program I'm working on, which was written by another professional who does not work in the company anymore. My doubts lie in the programming language itself, namely IEC-61131-3 (ST). In a section of the program (PRG) code, a BOOL variable appears without any assignment or evaluation, only itself followed by a semicolon, as this: PLC_Ok; I did not understand what the purpose of this, could anyone give an insight ? Thanks in advance.