In the form of case said PLC programming language

The two most commonly used programming language, one is the ladder diagram, the second is mnemonic language table. USES the ladder diagram programming, because it is intuitive and easy to understand, but you need a personal computer and the corresponding programming software; The mnemonic form facilitate experiment, because it only need a simple programmer, rather than having to use expensive graphics programmer or computer programming. Although some advanced PLC and computer compatible C also has special, BASIC, high-level language ( Such as Siemens GRAPH5, mitsubishi MELSAP) And cloth, logic language and general computer compatible assembly language, etc. The programming language, however, each manufacturer can only apply to products of our factory. PLC programming instructions: instructions are told what to do, and how to do the code or a symbol. In essence, instruction is just some binary code, this PLC is identical with the ordinary computer. PLC controller has compiled system at the same time, it can compile some text symbol or graphic symbol into machine code, so the user sees the PLC instruction general writing code rather than machine code, or graphic symbols. Commonly used mnemonic statement in English language ( Available multinational text) Abbreviations and number represents the corresponding instructions. Common graphic symbol or ladder diagram, it is similar to the electrical schematic diagram symbols, easily accepted by electrical workers. Command system: a PLC with the instructions of all referred to as the PLC system. It contains the instructions of how many, each instruction can do something, represents the PLC function and performance. Generally speaking, the PLC function is strong, good performance, its instruction system will be rich, what do it. We must make clear before programming the PLC program of instruction system: an ordered set of PLC instruction, PLC run it, can undertake the corresponding work, of course, here refers to the user program of PLC program. User programs generally designed by the user, PLC affiliate does not provide or manufacturer. Language expression program is not intuitive, readability is poor, especially the more complex procedures, more difficult to read, so most programs use ladder diagram to express. PLC ladder diagram, ladder diagram is through the attachment to the instructions of ladder diagram symbols together is the connected graph, used to express the use of PLC instruction and its sequence, it is similar with the electrical schematic diagram. Its attachment there are two: one for the bus, the other for internal relation line. The internal relation line puts ladder diagram symbol instructions together as a group, the instruction set is of general loading ( LD) Instruction, if necessary after again (with a number of input command LD instructions included) To establish logical condition. Finally for the output class instruction, realize the output control, or for the data control, process control, communication processing and monitoring work instruction, for the corresponding work. Bus is used to connect the instruction set. Below is the most simple of mitsubishi FX2N series products of trapezoidal legend: it has two groups, the first group to start, stop, control. A second group of only one END directives, to the END of the program. Ladder diagram and mnemonic corresponding relation: mnemonic instructions and ladder diagram with strict corresponding relation, and the connection to the ladder diagram and the sequence of instructions. Generally speaking, after the order is: the first input, output, Contain other processing) ; First, after; First left, then right. A ladder diagram can be translated into mnemonic program. Above the mnemonic programs for: 0000 ldx000 0001 orx010 0002 address instruction variables andnotx001 & amp; 国家统计局p; 0003 outy000 0004 end whereas according to mnemonics, also can draw the corresponding ladder diagram. Ladder diagram and schematic diagram of the electrical relations: if only considering the logical control, ladder diagram and electrical schematic diagram can also be set up certain corresponding relationship. Such as the output of the ladder diagram ( ) Instructions, corresponding to the relay coil, and input instructions ( E. g. , LD, AND, OR) Corresponding to the contact, interlock instructions ( IL、ILC） Can be as a master switch, and so on. In this way, the original relay control logic, the conversion can become a ladder diagram, further transformations, can become a statement table procedures. With this correspondence with the PLC program on behalf of relay logic is easy. This is also the PLC technology to the traditional relay control technology of inheritance.
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[拓展名称] include a great variety of devices with a wide range of complexity: from simple plc controller price used since prehistoric times to the complex of modern mechanized programmable control systems.