The three major development of PLC technology trend analysis

PLC has been nearly 40 years of development history, with the development of semiconductor technology, computer technology and communication technology, there have been great changes in the area of industrial control, PLC is also in constant development, is developing towards the new technology. One is the development of PLC network technology, there are two trends: on the one hand, the PLC network system is no longer a sui generis system is closed, but rapid development to the open system, in addition to develop their own brands PLC PLC network system with their own characteristics, equipment control task, also can connect with computer management system, realize the information exchange, as a part of the whole information management system; On the other hand, the widely used field bus technology, PLC and other installation in the field of intelligent devices, such as intelligent instruments, sensors, intelligent electromagnetic valve, intelligent drive actuators, etc. , through a transmission medium ( Such as twisted pair, coaxial cable, fiber optic cable) Link, and follow the same communication protocols transmit information to each other, thus constitute a field of industrial control network, the network compared with pure PLC remote network, the configuration is more flexible, more convenient expansion, lower cost, cost performance is better, more open. The second is the PLC to develop in the direction of high performance miniaturization. The function of PLC is more and more rich, and volume is smaller and smaller. Such as mitsubishi FX - 1 s series PLC, the smallest model, the volume is only 60 * 90 * 75 mm, the equivalent of a relay, but it has a high speed counter, slope, alternating output and 16 arithmetic ability, also has the adjustable potentiometer time setting function. Early PLC is no longer the only switch logic operations and products, but with more and more strong analog processing ability, and the other in the past only on the computer with advanced processing capabilities, such as floating-point arithmetic, PID control, temperature control, precise positioning, stepper drives, statistics report, etc. In this sense, PLC and DCS (distribute control system ( Distributed control system) The difference has been more and more small, can also constitute a process control system with PLC. 3 it is PLC to develop in the direction of easy operation. The PLC is one of the difficulty of the promotion complex programming enables users, and different manufacturers have different PLC programming language used, users often need to master a variety of programming languages, is difficult. PID control, network communication, high speed counter, position control, data record, formulation and text display is also the difficulty in the PLC program design, programming and application by the method of ordinary programming, they need to be familiar with the special significance of memory, when programming for their assignment, runtime by visiting them to realize the corresponding function. These programs are also related to interrupt the process of programming is tedious and error-prone, hampered the further popularization and application of the PLC. PLC controller inevitably in the operation should be direction of development, such as the use of programming guide to simplify the complicated task of programming, Siemens on this point as the forerunner, Siemens S7 - 200 programming software designed numerous programming guide, only need to input some parameters in the dialog, you can automatically generate the user program, including interrupt program, greatly facilitate the use of the user.
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