HONEYWELL 51305072-300 CLCN-B 工作原理 From the late 1980s to the mid-1990s, with the popularization and application of computer and network technology, the rapid development of VLSI, gate array and application-specific integrated circuits, the CPU of the programmable controller has been developed into a 16-bit or 32-bit microcomputer. The processor is composed, the processing speed has been greatly improved, and the functions of high-speed counting, interrupt, PID, motion control and other functions have been introduced into the programmable controller. The programmable logic controller can meet various fields of the industrial production process. The programmable logic controller has completely replaced the traditional logic control device, analog instrument control device and DDC (direct digital control) control device with a small computer as the core. . Due to the enhanced networking capability, it can be connected to the host computer, and can also be connected to FLEX I/O or remote I/O, so that it is no longer difficult to form a distributed control system (DCS). Ladder diagram language and statement list language are fully mature and basically standardized, SFC (sequential function chart) language is gradually popularized, special programmers have been replaced by personal computers and corresponding programming software, and human-machine interface devices are becoming more and more perfect. The monitoring and management of the entire plant, and the development of redundant technology, greatly enhance the reliability.
In the 21st century, programmable logic controllers still maintain a strong development momentum, and continue to expand their application fields, such as configuring flexible manufacturing systems (FMS) and computer integrated manufacturing systems (CIMS) for users. At present, programmable logic controllers are mainly expanded in two directions: one is the integrated control system, which has broken through the original concept of programmable logic controllers, closely combining factory production process control with information management systems, and even upward The technical foundation is prepared for MES and ERP system. This development trend will make the difficult ERP system have a solid technical foundation, which will bring about a revolution in industrial control and realize an electronic information factory in the true sense; The second is the emergence of micro-programmable controllers, the size of which is the size of a palm, the functions can cover the control functions of a single device and the entire workshop, and have networking functions. This miniaturized programmable controller enables the control system to extend its reach. to every corner of the factory. With the acceleration of the process of world economic integration, developed countries have paid more attention to the protection of the intellectual property rights of programmable logic controllers at the same time as technology development, and large international programmable logic controller manufacturers have joined the programmable logic controller The International Organization for Standardization, they use many technical standards to establish technical protection barriers that are in their economic interests.
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