Mr. Chow

In addition to the basic instructions for switch control, timing, and counting, there are also a large number of application instructions, some with hundreds of application instructions. For application instructions, beginners are very confused. They don’t know which instructions are important, which instructions are commonly used, and how to learn them. These instructions can be divided into the following types
. It belongs to instructions that are common in almost all computer languages, such as data transfer, comparison, shift, loop, mathematical operations, word logic operations, data type conversion and other instructions.
This type of instructions is very important. They are related to the basic knowledge of computers (such as number system, data type, addressing mode, etc.). The basic functions of these instructions should be understood through examples and experiments. Once you learn this type of instructions for one model, it will be easy to learn other similar instructions.
． Instructions related to sequence control programs. Among this type of instructions, the instructions are the best designed. There is a clear correspondence between the ladder diagram designed with instructions and the sequential function chart, so it is easy to understand and use. The designed program is shorter than that designed by other methods, which can save a lot of time. Design time.
The r (sequential control relay) instruction and Omron's step instruction are also used to write sequence control programs.
It is recommended that before learning such instructions, you first learn the sequential function chart (see the textbook written by the author).
． Instructions related to advanced applications, such as instructions related to d control, motion control, high-speed input/high-speed output, and communication, are also important. Some instructions require learning relevant expertise in order to understand and use them correctly.
． Instructions related to specific hardware and software, such as instructions for reading and writing special modules and analog potentiometers, instructions for reading the length and number of data blocks, etc.
． Instructions related to certain engineering applications. For example, cam sequence control instructions and rotary table control instructions.
When learning application instructions, you can first browse the application instructions you have learned according to the instruction classification and what they are used for, so that you can find the instructions in the manual or help when needed. When you first learn, there is no need to spend a lot of time understanding the detailed usage of application instructions, and there is no need to memorize them by rote. The focus is on understanding the basic functionality of the directive.
You can adopt the method of learning what you need, focusing on learning the instructions that you encounter and need to use when reading and programming programs, and ignore the unused instructions for the time being. If you encounter uncommon instructions when reading or writing a program, you can learn their detailed usage through the programming manual.
If the programming software has online help for the instruction, select an instruction in the instruction list or program and press a key to see a large number of details of the instruction, such as the data type of each parameter of the instruction and the available storage areas. , the meaning of parameters, the function and application examples of instructions, the impact of instruction execution on status words or related flag bits, etc.
Just like learning a foreign language cannot just rely on memorizing words, but should mainly be learned through reading and conversation, learning applied instructions well requires practice. Be sure to learn the application instructions in the process of reading and programming.
Some instructions are actually rarely used. They are dormant instructions and you can ignore them when learning. If you encounter them while reading the program, you can learn about them through the online help of the instructions or by consulting the manual.
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