In recent years, significant development trend of PLC technology in function

PLC technology developing rapidly in recent years, many new products every year. According to incomplete statistics, the United States, Japan, Germany and other production PLC controller has reached more than 150 manufacturers, there are hundreds of different products. The function of PLC is growing, mainly displays in: 1) Control scale, a single PLC can control thousands or even tens of thousands of points, many sets of PLC can be controlled with a link in tens of thousands of points. 2) Instruction system enhancements, can carry out logic operations, timing, counting and arithmetic operations, PID arithmetic and system transformation, processing of ASC Ⅱ yards. High-grade PLC can also handle the interrupt, call subroutine, etc. Allows the PLC controller to realize logic control, analog control, numerical control and other process monitoring, and can replace the small computer control in some way. 3) Improve the processing speed, the average processing time of each point increased from about 10 mu s to within 1 mu s. 4) Programming capacity increase, from a few K bytes increases to dozens of K, or even hundreds of K bytes. 5) Programming language diversity, most use ladder diagram language and statement table, some still can use flowcharts or high-level language. 6) Increase the communication and networking, more between the PLC can communicate with each other, exchange data, PLC controller can also communicate with computer, computer command, and tell the computer will execute the results. Communication interface use RS - more 422 / RS - 232 c and other standard interface, in order to realize multi-stage distributed control. At present, in order to meet different needs, to further enlarge the range of application of PLC in the field of industrial automation, PLC is developing towards the following two directions. One is a low-grade PLC to develop in the direction of small, simple, cheap, make it widely replaced relay control; The second is to large, medium and top grade PLC high-speed, multi-function direction, make it can replace part of the industrial microcomputer control function, comprehensive automatic control for large-scale complex system. PLC instead of relay control on CNC machine, the nc machine tool structure is more compact, more feature-rich, greatly improve the response speed and reliability. In the numerical control machine tools, machining centers and other high degree of automation of processing equipment and manufacturing system, is indispensable in the PLC control device.
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