TRICONEX 2000417

Description

TRICONEX 2000417
PLC is a device specially developed for industrial automatic control. Usually, PLC uses “natural language” programming oriented to control process and problems. The products of different manufacturers use different programming languages, such as ladder diagram, statement table, control system flow chart, etc. In order to enhance the various operation functions of PLC, some PLCs are also equipped with BASIC language, and are exploring the use of other high-level languages for programming.

The PLC products produced by FANUC, Lishi, Mitsubishi and Fuji in Japan all adopt ladder diagram programming. When a programmer is used to input a program to the PLC, the general simple programmer uses the code table for input, and the large programmer can also use the ladder diagram for direct input. In many PLC products, due to different manufacturers, the representation method of the instruction system and the mnemonic in the statement table are also different, but the principle is completely the same. In this book, we take FANUC-PMC-L as an example to introduce the PLC instructions applicable to the control of CNC machine tools. In FANUC series PLC, the specifications and models are different, but the number of functional instructions is different. For example, there are 23 FANUC-BESK PLC-B functional instructions developed jointly by Beijing Machine Tool Research Institute and FANUC Company. In addition, the instruction system is completely the same.

There are two kinds of instructions in FANUC-PMC-L: basic instructions and functional instructions. When designing sequential programs, basic instructions are used most, with 12 basic instructions in total. The function command is convenient for programming the special operation control of the machine tool. There are 35 function commands.

During the execution of basic and functional instructions, a stack register is used to temporarily store the intermediate results of logical operations. The stack register has 9 bits (as shown in Figure 1), and works according to the principle of FIFO and LIFO. When the current operation result is pushed in, all the original states of the stack are moved to the left by one bit; On the contrary, when the operation result is taken out, the stack is all shifted one bit to the right, and the last pressed signal is first restored to read.
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