United States during his tenure. Struger played a leadership role in developing IEC 61131-3 PLC programming language standards. Allen-Bradley's PLC-5 family, preceded by the 1774-PLC (released in the 1980's, was the first modular design found in modern-day systems.

While Modicon was the most popular of the first full featured PLC's through the early 1980's, Allen Bradley overtook them in the mid-1980's and grew to own the largest market share of PLC hardware and software in North America.

Early methods of programming

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