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1、PLC CharacteristicPLC English full title Programmable Logic Controller, Chinese full title as the programmable logical controller, the definition is: One kind of digital operation operations electronic system, for designs specially in the industry environment application. It uses a kind of programma
2、ble memory, uses in its internally stored program, the actuating logic operation, the sequential control, fixed time, counting and arithmetic operation and so on face users instruction, and through digital either simulation type input/output control each type machinery or production process. PLC cha
3、racteristic: 2.1 reliability is high, antijamming ability. depending on the nature is the electric control equipments essential performance. Because PLC uses the modern large scale integrated circuit technology, used the strict technique of production manufacture, the internal circuit has adopted th
4、e advanced antijamming technology, had the very high reliability. For example the Mitsubishi Corporation produces F series PLC mean time between failure reaches as high as for 300,000 hours. Some use redundancy CPU PLC average trouble-free operating time is longer. From the PLC outside the aircraft
5、electric circuit, uses the PLC constitution control system, compares with the same level scale following the electrical pick-off system, the electrical wiring and the switch contact reduced to several hundreds even several thousands 1, the breakdown also greatly reduces. In addition, PLC has the har
6、dware fault self-measuring ability, presents when the breakdown may send out the warning information promptly. In the application software, the application may also enroll the periphery components breakdown from the diagnostic program, causes in the system also obtains the breakdown besides the PLC
7、electric circuit and the equipment from the diagnosis protection. Thus, the overall system has the extremely high reliability also not to feel strange.2.2 necessary complete, the function is perfect, serviceable. PLC develops today, had already formed the large, medium and small each scale serialize
8、d product. May use in each scale the industrial control situation. Besides the logical processing function, modern PLC mostly has the consummation data operation ability, may use in each kind of numerical control domain. In recent years the PLC function unit emerged massively, causes PLC to seep the
9、 position control, the temperature control, CNC and so on each industrial control. In addition the PLC traffic capacitys enhancement and the man-machine contact surface technologys development, uses PLC to compose each kind of control system becomes very easy. 2.3 easy to study easily to use, the de
10、pth is welcome the engineers and technicians. PLC takes the general industrial control computer, is faces Industrial and mining establishments labor to control the equipment. Its connection is easy, the programming language accepts easy for the engineers and technicians. The trapezoidal chart langua
11、ges graphics symbol and the turn of expression and the relay circuit diagram is quite close, only uses PLC the few switch quantity logical control instruction to be possible to realize the relay electric circuits function conveniently. For not the familiar electronic circuit, did not understand the
12、computer principle and the assembly language person uses the computer to be engaged in the industrial control to open gate of the convenience. the 2.4 systems design, the construction work load are small, maintain conveniently, easy to transform. PLC replaces the wiring logic with the stored logic,
13、reduced the control device exterior wiring greatly, causes control system design and the construction cycle is the reduction greatly, simultaneously maintains also becomes easy. Causes the identical equipment possibly to become more importantly after the alter procedure change production process. Th
14、is very suitable multi-varieties, small batch production situation. the 2.5 volume is small, the weight is light, the energy consumption is low. Take subminiature PLC as the example, recently produced the variety base size is smaller than 100mm, the weight is smaller than 150g, the power loss only c
15、ounts the tile. Because the volume small very easy to load in the machinery, realizes the integration of machinery ideal control device. Since long, PLC is in the industrial automation control domain throughout the main battlefield, has provided the very reliable control application for various auto
16、mation control device. It can provide safe reliable and the quite perfect solution for the automated control application, suits in the current Industrial enterprise to the automated need. Since the 1980s, as a result of the computer technology and microelectronic technologys rapidly expand, the enormous impetus PLC development, the PLC function which caused strengthened day by day. If PLC may carry on the simulation quantity control, the position control and the PID con
