QB1TFEE030
The working principle of PLC and some related basic content are very important in this learning process. Based on my personal learning experience, the next step in learning the program is to understand and understand its command function and application. According to the introduction and explanation in the book, the working principle of the internal circuit of PLC is similar to the working principle of hardware. There are counter CNTs and many soft relays or relay soft contact soft wiring inside the PLC, To drive a load, some sensors or switches are used to send signals to the PLC, and then the PLC receives the signals from the external hard circuit, which are received step by step through each stage of the program, and then output them! Not to mention the fixed programs, which are all made by the manufacturer using ROM storage unchanged programs! Generally speaking, lithium batteries are used as backup batteries, with a service life of 5 to 10 years. If they are frequently loaded, they usually take 2 to 5 years! There are three types of I/O point capacity for PLCs: small computers with 256 points or less, medium computers with 256 to 1024 points or more, and mainframe computers with 1024 points or more. The available resources provided to users are usually expressed in terms of K word KW, K byte BK, or K bits, with 1K=1024. Some PLCs are also directly expressed in terms of the amount of programs they can store. The address unit of programs stored in some PLCs is
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