![]() ![]() The process control modules of a DCS often implement discrete logic, but their discrete I/O capabilities and slow scan rates rarely match that of a PLC. Scan rates much faster than 100 msec are common. The manufacturers of PLCs provide robust, cost-effective discrete I/O modules that can scan discrete data points (sensors) very rapidly. They can be programmed using the same ladder logic diagrams or other textual and graphical programming languages to represent logic and are an excellent tool to implement discrete logic. ![]() Programmable logic controllers (PLCs) were developed in the 1970s in order to replace hard-wired relay logic. Edgar, in Encyclopedia of Physical Science and Technology (Third Edition), 2003 VII.C Programmable Logic Controllers
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