Programmable controller processor with an intelligent functional module interface

摘要: A programmable controller has a rack that houses and electrically connects number of I/O modules processor module. The module includes external communication network interface, system memory, section which executes user-defined control program interface handles the exchange data with other modules. circuitry for pre-processing from defined input modules, thereby relieving processing certain tasks. shared memory contains information defining to obtain bits be examined specified logic level transitions. stored also designates frequency at is read how many occurrences transitions must take place before signals complete.