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  • Comparison of PLCs and Ladder Logic with Opto 22 Hardware and Software
    to be literally. re-wired. Ranks of relays in semi-automated factories,. notably automobile plants in the late 1960s. The. programming method that most PLCs use is called. ladder logic. Ladder logic is a software representation. of the wiring diagrams used in the old days of discrete. relays and timers (see