PLC Programmable Controller Symbols
PLC，即Programmable Logic Controller，是可编程逻辑控制器的缩写。它是一种数字计算机，用于控制、监测和管理工业系统。PLC的主要符号包括：1. AI：人工智能，2. AND：与，3. AO：模拟输出，4. BI：二进制输入，5. BNC：带缓冲的数控，6. BO：二进制输出，7. BTO：批量传输，8. BYP：旁路，9. CMD：命令，10. COE：计数器使能，11. CUR：当前位置，12. DATA：数据，13. DBR：数据块，14. DINT：双字整数，15. DO：数据输出，16. ESTOP：紧急停止，17. EV：事件，18. FB：功能块，19. FC：流程图，20. FM：频率模块，21. GET：获取，22. GOTO：转到，23. IN：输入，24. INT：中断，25. INTPEND：中断待处理，26. IO：输入输出，27. IP：接口点，28. KBK：钥匙开关，29. LATCH：锁存器，30. LED：发光二极管显示，31. LIMIT：极限，32. LWR：低电平复位，33. MEDIATOR：媒介物，34. MIN：最小值，35. MIO：多输入输出，36. MLD：多层描述，37. NBR：编号范围，38. NEGATION：非（逻辑），39. OFS：输出故障状态指示，40. ON-OFF CONTROL：开关控制，41. OR：或（逻辑），42. OUTPUTS：输出值列表，43. PARAMETER：参数，44. PATHNAME：路径名，45. PEND：待处理（信号），46. PFITZER TERM（PFT）：拟合项（复数），47. PLC-RUN：（程序）运行（信号），48. PLC-TERM：（程序）终止（信号），49. POWER-OFF：（电源）关闭（信号），50. POWER-ON：（电源）开启（信号）
PLC, which stands for Programmable Logic Controller, is a crucial piece of equipment in various industrial applications. PLCs are designed to store, process, and implement digital logic instructions, providing efficient control of machinery or processes. They are typically used in automation systems to monitor and manage operations such as temperature, pressure, and flow rates. In this article, we will explore the symbols commonly associated with PLCs and their role in industrial automation.
Symbol Recognition in PLC Programming
When programming PLCs, it is essential to recognize and understand the various symbols used to represent different functions and operations. These symbols, often referred to as opcodes or instruction codes, are specific to the PLC model and manufacturer being used. They provide a standardized way for programmers to quickly identify and implement common tasks within the PLC environment.
Common PLC Symbols
1、Input Symbol: Typically represented by a circle with a line extending from it, the input symbol identifies the point at which signals are received from external sources, such as sensors or buttons.
2、Output Symbol: The output symbol, often a square with a line extending from it, indicates where signals are transmitted to external devices, such as motors or relays.
3、Timer Symbol: The timer symbol, usually a clock or watch symbol, represents the ability of the PLC to delay or time-based functions. It allows for precise control of events, such as the activation of a pump after a specific time period.
4、Counter Symbol: The counter symbol, often a tally or bar chart, indicates the ability of the PLC to count events or pulses from sensors. This symbol is commonly used in applications where the number of events needs to be tracked or controlled.
5、Relay Symbol: The relay symbol, usually a small rectangle with a circle on top, represents an electrical relay within the PLC system. Relays are used to switch large currents or voltages when triggered by a smaller current or voltage from the PLC output.
6、Fuse Symbol: The fuse symbol, often a small rectangle with a line extending from it, indicates a fuse within the PLC system. Fuses are used to protect against excessive current or voltage that could damage the PLC or connected devices.
Symbol Interpretation and Application
When programming PLCs, it is essential to interpret and apply these symbols correctly to ensure accurate and reliable operation of the system. Each symbol has a specific meaning and function within the PLC environment, and it is important to understand how they interact with each other and with the rest of the system. By carefully analyzing and implementing these symbols, programmers can create complex and powerful PLC applications that meet the specific needs of their industrial environment.
In conclusion, PLC symbols are crucial to understanding and implementing effective industrial automation solutions using programmable logic controllers. By mastering these symbols and their associated functions, programmers can create robust and reliable systems that streamline operations and improve efficiency in industrial settings.
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