The first introduction of PLC is in 1960. PLC has built for decrease lost pay for changing the control system that using relay. MODICON (Modular Digital Controller) 084 is the first PLC for commercial.
Based on increasing necessity in production processing is causing the system must changing in some period. If the system that used is mechanic relay, it will make big problem. In 1970, the great of PLC technology is sequencer and CPU using bit-slice.
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