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A programmable logic controller (PLC) or programmable controller is an industrial computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, machines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis.
Twibrigh RONJA — a 10 Mbit/s full duplex FSO wireless optical network adapter from 2001 [2] System76 Thelio Io — System76 Thelio desktops use an open-source daughterboard to control thermals and other functions. This is a step toward building a fully open-source computer and give users full control over their hardware. [3]
A building automation system (BAS) is an example of a distributed control system. Home automation – control system of a home. Office automation – the varied computer machinery and software used to digitally create, collect, store, manipulate, and relay office information needed for accomplishing basic tasks such as business process ...
A feedback control loop is directly controlled by the RTU or PLC, but the SCADA software monitors the overall performance of the loop. For example, a PLC may control the flow of cooling water through part of an industrial process to a set point level, but the SCADA system software will allow operators to change the set points for the flow.
Xilinx produced the first commercially viable field-programmable gate array in 1985 [3] – the XC2064. [5] The XC2064 had programmable gates and programmable interconnects between gates, the beginnings of a new technology and market. [6] The XC2064 had 64 configurable logic blocks (CLBs), with two three-input lookup tables (LUTs). [7]
The idea of "digital manufacturing" became prominent in the early 1970s, with the release of Dr. Joseph Harrington's book, Computer Integrated Manufacturing. [5] However, it was not until 1984 when computer-integrated manufacturing began to be developed and promoted by machine tool manufacturers and the Computer and Automated Systems Association and Society of Manufacturing Engineers (CASA/SME).
Ladder diagrams were once the only way to record programmable controller programs, but today, other forms are standardized in IEC 61131-3. For example, instead of the graphical ladder logic form, there is a language called Structured text , which is similar to C, within the IEC 61131-3 standard.
SIMATIC is a series of programmable logic controller and automation systems, developed by Siemens.Introduced in 1958, the series has gone through four major generations, the latest being the SIMATIC S7 generation.