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Historical Overview The numerically controlled (NC) machine tool became to be controlled by computers and the robot was developed in this period.
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In the meantime, programmable logic controller (PLC) was developed and it replaced the conventional, relay-based controller, having relatively limited control functions. In the 1960s, the application of a minicomputer was still a fairly expensive solution for many control problems. The term direct digital control (DDC) was used to emphasize that the computer directly controls the process. Historical Overview At the beginning of 1960, a digital computer was for the first time really applied as a digital controller. These technologies are still very common. The pneumatic control technology made it possible to control remote systems by a centralized control system. After the period, the pneumatic control technology and the hydraulic power were introduced.
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Historical Overview In the early 20th century, the process control systems and the manufacturing systems were designed based primarily on the mechanical technology and with analogue devices. References Hoàng Minh Sơn - Mạng truyền thông công nghiệp – Nhà xuất bản khoa học và kỹ thuật, 2007 Các tài liệu kỹ thuật thiết bị điều khiển công nghiệp của SIEMENS, ROCKWELL Trương Đình Nhơn Bộ môn Tự động Điều khiển Email: Ĭontent § Basic industrial network § Profibus § DeviceNet § ControlNet § ASi § Ethernet