By executing the loop quickly enough, the effect still seems like a simultaneous and immediate execution within the required time tolerance. But if the program is applied to PLCs, the rules are executed sequentially through software and in a continuous loop. Each "rung" in the ladder represents a rule, so when implemented to relays and various electromechanical devices, these rules execute simultaneously and immediately. Ladder logic is described as a rule-based language rather than a procedural or imperative one.
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