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...Iec dr tarek a tutunji introduction the international electrotechnical commission committee developed standard in an effort to standardize programmable controllers later added number new standards not followed yet one of s objectives was create common set plc instructions that could be used all plcs for consists five parts general information equipment and test requirements programming languages user guidelines messaging services communications language is referred as defines two graphical text based flow chart use ladder diagrams ld function block diagram fbd instruction list il structured st sequential sfc...