In programming, the programmable control module is that complete a function to require the program or subroutine, or an independent program unit that can be handled by the compiler and assembler and so on, or is a part of the large software system.
The plc communication module is also known as one of components for industrial automation that can be named separately and perform certain functions independently. There are two basic features: external features and internal features. External characteristics refer to the interface between the module and the external environment (it is the way that other modules or programs routine call this module, including input and output the parameters, referenced global variables) and the function of the module.
Internal characteristics refer to the characteristics of the internal environment of the module (the module's local data and program code). Modules have various types, such as the unit operation module, the calculation method module and the physical and chemical properties module and cheap programmable logic controller module and so on, and the plc module price also various and competitive.
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