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PLC編程是一種數字運算操作的電子系統，專為在工業環境下應用而設計。
它采用可編程序的存儲器，用來在其內部存儲執行邏輯運算、順序控制、定時、計數和算術運算等操作的指令，并通過數字式、模擬式的輸入和輸出，控制各種類型的機械或生產過程。
PLC的發展適應了工業生產過程控制的要求。在初創 期，產品的目標是按10項招標技術指標開發的。
PLC類別
一.整體式結構
它的特點是結構緊湊，體積小，成本低，安裝方便，
缺點是輸入/輸出點數是固定的，不一定能適合具體的 控制現場的需要。這類產品有OMRON公司的C20P、 C40P、C60P，三菱公司的Fl系列，東芝公司的EX20/40系列 列等。
二.模塊式結構
這種結構形式的特點是把PLC的每個工作單元都制成獨立 的模塊，如CPU模塊、輸入模塊、輸出模塊、電源模塊、通 新模塊等。
PLC的特點是系統構成非常靈活，安裝、擴展 展、維修都很方便，缺點是體積比較大。常見產品有 OMRON公司的C200H、C1000H、C2000H，西門子公司的 S5-115U、S7-300、S7-400系列等。
PLC基本功能
- 邏輯控制功能
- 定時控制功能
- 計數控制功能
- 步進控制功能
- 數據處理功能
- 回路控制功能
- 通訊聯網功能
- 監控功能
- 停電記憶功能
- 故障診斷功能
翻譯成英文：
Introduction to PLC
PLC definition
PLC programming is an electronic system for digital operation, designed for application in an industrial environment.
It uses programmable memory to store instructions for performing logic operations, sequence control, timing, counting and arithmetic operations, and control various types of machinery through digital and analog input and output. Or the production process.
The development of PLC has adapted to the requirements of industrial production process control. In the initial stage, the target of the product was developed according to 10 bidding technical indicators.
PLC category
1. Integral structure
It is characterized by compact structure, small size, low cost and easy installation.
The disadvantage is that the number of input/output points is fixed, which may not be suitable for specific control site needs. Such products include OMRON's C20P, C40P, C60P, Mitsubishi's Fl series, and Toshiba's EX20/40 series.
2. Modular structure
The characteristic of this structure is that each working unit of the PLC is made into an independent module, such as CPU module, input module, output module, power supply module, communication module and so on.
The characteristic of PLC is that the system configuration is very flexible, installation, expansion, and maintenance are very convenient. The disadvantage is that it is relatively large. Common products include OMRON's C200H, C1000H, C2000H, Siemens' S5-115U, S7-300, and S7-400 series.
PLC basic functions
- Logic control function
- Timing control function
- Counting control function
- Step control function
- Data processing function
- Loop control function
- Communication network function
- Monitoring function
- Power failure memory function
- Fail diagnosis function
