DCS is advanced version of PLC and DCS works in real time frame while PLC not.
There is no monitoring devices in PLC like DCS.
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PLC differences between timer and counter
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PLC or programmable logic controller is a digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly line, amusement rides, or lighting fixtures.
PLC stands for "programmable logic controller". PLC's are usually used to control machinery in automated processes such as manufacturing. PLC programmers usually complete a trade school certificate before starting their careers.
PLC stands for Programmable Logic Controller. Depending on the type of PLC, you can implement arbitrary logic, including sequential state generation if need be, by simply programming the PLC.