Since what year has the programmable logic control (PLC) been used in the industry?

The correct answer is that programmable logic controllers (PLCs) have been in use since 1968. PLCs were developed to replace relay-based control systems, offering greater flexibility, reliability, and ease of programming. The technology was particularly advantageous in manufacturing and industrial automation, where the need for rapid adjustments and reconfigurations of control systems was essential. The introduction of PLCs marked a significant advancement in control technology, enabling industries to improve efficiency and reduce downtime. This historical context helps underscore the impact PLCs have had in streamlining operations and enhancing productivity across various sectors.