The main development direction of large scale PLC summary & have spent Why need large PLC

Large-scale PLC development direction mainly has the following several aspects: (1) function continuously strengthen: not only has the basic function such as logic operation, counting, timing, also has the numerical computing, simulation, adjustment, control, record, display, and the computer interface, communication, etc. Networking is an important feature in the development of PLC. All kinds of personal computer, graphics workstations, minicomputers, etc all can be used as a PLC monitoring host or workstation, the combination of these devices can provide the screen display, data acquisition, record keeping, circuit panel displays, etc. Lots of PLC networking and PLC controller compatibility of different manufacturer production increase, the distributed control and centralized management can easily implement. (2) application scope expands unceasingly, can not only general logic control, all kinds of interface module can interrupt control, intelligent control, process control, remote control, etc. Tend to be used in process control of PLC memory capacity and speed demand is higher, therefore, the development of the high-speed analog input module, a dedicated independent PID controller, multiplexer, etc. , makes the digital and analog technology be unified in the programmable controller. Adopt the method of combining software and hardware, programming and wiring with conventional instrument control is much more convenient than the past. (3) the performance improving: using high performance microprocessor, improve the processing speed, speed up the response time of the PLC; In order to enlarge the storage capacity, many companies have used magnetic bubble memory or hard disk; Using multiprocessor technology, to improve performance; Using redundant heat standby system or three choose two voting system, in order to improve system reliability. To further simplify system design and programming in the field of special control, special intelligent input/output module is more and more, such as the special intelligent PID controller, intelligent analog I/O module, intelligent position control module, language processing module, nc module, intelligent communication module, calculation module, the module of a feature is itself has a CPU, can work independently, they host parallel operation with PLC, whether in the speed, accuracy, adaptability and reliability aspects have carried on the very good supplement to the PLC. They bind to PLC and helps to overcome the limitation of PLC scan works, complete PLC controller itself cannot complete many functions. (4) the programming software of diversification and high-level, standardization, using a variety of programming languages, a sequential control oriented step sequence and process flow chart of the control system oriented languages, which is a function block oriented language, can represent dynamic variables and signals in the process of mutual coupling; There will be compatible with computer high-level language, such as BASIC, C and assembly language; In addition, a special high-level language, such as mitsubishi MELSAP adopt the method of compiling the statement into a ladder diagram program. Are also using Boolean logic language, the CPU can be executed directly AND, OR, XOR, NOT operation, the language fast, but NOT very intuitive. PLC will also have a database, and database sharing, which can realize the whole network will also be development of adaptive control and expert system. (5) constitute a form of diversification and distribution: PLC and I/O mouth dispersion, dispersion of each I/O port input and output points I can get a few points to 10, decentralized units can be dozens or hundreds, communication and network function gradually enhanced. Development as a branch of CIMS, CIPS, PLC itself can also be scattered, dispersed combination of PLC and the upper machine feeder system, scattered, it is easy to form multilayer distributed control, in order to realize the whole factory or automation control and management of the enterprise. Between different models of PLC controller, PLC and the computer can be easily connected to the Internet, realize the resource sharing, and powerful network monitoring software, forming large PLC control network system.
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