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andre_teprom posted a topic in Other PLCsHello, 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.