PCL编程（国外英文资料）.doc

PCL编程（国外英文资料） LC easy? Some people say its easy to learn, but more people say its hard to learn. My view is that it is easy to get started and difficult to study. There is always a way to get started. A lot of people have bought books on PLC, and if you look at it from the beginning, I dont think it will be possible. Because abstract and hollow occupy whole brain, a sentence faint! Learn this thing to have programmable controller and simple programmer is good, if have no, say, learn not. Because you cant verify the right and the wrong. How to learn, my approach is to go straight to the topic. Practice is as follows: The difference between the idea of a trapezoidal diagram and the principle of relay1 control: Relay control principle diagram of the element symbol, a normally open contact, normally closed contact and coil, in order to distinguish them, the symbol on the edge of the label such as KM, KA, KT in different devices, but the number of the contact is limited. In the PLC ladder diagram, there are also regular open, often closed contact points, which can also be marked on the side by the different soft devices of X, Y, M, S, T, and C. Its greatest advantage is that the same marked contact can be repeated over and over again at different levels. Relays fail to do so. The coils are used in the same way that different coils can only occur once. 2, the classification of programming components: programming element is divided into eight categories, X for input relay, Y for the output relay, M for state relay for auxiliary relay, S, T for counter for timer, C, D for the data register, and pointer (P, I, N). The function of various kinds of components, the various kinds of PLC books are introduced, so it is not introduced here, but it is important to understand the functions of various components. The instructions for the programming elements consist of two parts: the LD (the functional implications) X000 (the component address), the LD X000, LDI Y000... It is. Familia