Designed for industrial automatic control development of PLC programming language implementation process

PLC is designed for industrial automatic control and the development of the device, usually PLC controller used for process control, problem oriented programming 'natural language'. Different manufacturers products using programming language, these programming languages with ladder diagram, the statement table, flow chart of control system, etc. In order to enhance the operation function of PLC controller, PLC and equipped with BASIC language, and are exploring to programming with other high-level languages. Japan FANUC, standing stones, such as mitsubishi, Fuji, the production of PLC products, use the ladder diagram programming. In programmer input to the PLC program, the general and simple programmer code tables using input, large-scale programmer also can use ladder diagram input directly. In numerous PLC controller products, because the manufacturer is different, the instruction system of representation and statements in the table mnemonics are also different, but the principle is the same. In this book we use FANUC - PMC - L as an example, applicable to numerical control machine tool is introduced that the PLC instruction. In FANUC series PLC, specifications at the same time, not just the number of functional instruction is different, such as Beijing machine tool research institute cooperative development of FANUC - with FANUC company BESK PLC - B function instruction article 23, in addition to this, instruction system is exactly the same. In FANUC - PMC - L that there are two types of instructions: basic instructions and functions. When designing the order program, use the most is the basic instruction, a total of 12 basic instructions. Special function instruction for machine tool operation control programming, article 35 function instruction. In the basic in the execution of instructions and functions, with a stack register temporary logical operation of the intermediate results, the stack register nine ( As shown in figure 1) According to the advanced after the work, the principle of last in, first out. The current operating results trendy, stack to the original state of all left one; each Instead take out operation results stack all moves to the right one, the last pressure into the signal recovery read first. Figure 1 stack registers operating sequence
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