PROGRAMMABLE LOGIC CONTROLLER
Before the PLC, control, sequencing, and safety interlock logic for
manufacturing automobiles was mainly composed of relays, cam timers,
drum sequencers, and dedicated closed-loop controllers. Since these
could number in the hundreds or even thousands, the process for
updating such facilities for the yearly model change-over was very time
consuming and expensive, as electricians needed to individually rewire
relays to change the logic.
manufacturing automobiles was mainly composed of relays, cam timers,
drum sequencers, and dedicated closed-loop controllers. Since these
could number in the hundreds or even thousands, the process for
updating such facilities for the yearly model change-over was very time
consuming and expensive, as electricians needed to individually rewire
relays to change the logic.
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