61C22B 控制装置

型号:61C22B

品牌:Reliance Electric

生产国家/地区:美国

61C22B Reliance Electric

桌面操作系统与RTOS相比，另一个差别就是对于稳定、可靠方面的设计思路。一方面，桌面操作系统比较庞大、复杂，而RTOS比较小巧、简捷，而'越简单、越可靠，越复杂、故障概率越大这又是一个常理。另一方面，重要的是:桌面操作环境与嵌入式环境在设计思路上有一个重大的不同——桌面环境定应用软件与操作系统相比而言可以是不可靠的，而嵌入式环境定应用软件与操作系统—样可靠。

运行于嵌入式环境中的RTOS要求应用软件具有与操作系统同样的可靠，这种设计思路对应用开发提出了高的要求，同时也要求操作系统自身足够开放。

可编程控制器(PROGRAMMABLE CONTROLLER，简称PC)。与个人计算机的PC相区别，用PLC表示。

PLC是在传统的顺序控制器的基础上引入了微电子技术、计算机技术、自动控制技术和通讯技术而形成的一代新型工业控制装置，目的是用来取代继电器、执行逻菜记时、计数等顺序控制功能，建立柔的程控系统。电工委员会(IEC)颁布了对PLC的规定:可编程控制器是一种数字运算操作的电子系统，专为在工业环境下应用而设计。它采用可编程序的存贮器，用来在其内部存贮执行逻辑运算、顺序控制、定时、计数和算术运算等操作的指令，并通过数字的、模拟的输入和输出，控制各种类型的机械或生产过程。可编程序控制器及其有关设备，都应按易于与工业控制系统形成一个整体，易于扩充其功能的原则设计。

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61C22B 控制装置

 On the one hand, the desktop operating system is relatively large and complex, while the RTOS is relatively small and simple, and 'the simpler and more reliable, the more complex, the greater the probability of failure is a common sense. On the other hand, it is important to note that there is a major difference in design thinking between the desktop operating environment and the embedded environment - the desktop application software can be unreliable compared to the operating system, while the embedded application software is as reliable as the operating system.

RTOS running in embedded environment requires the application software to have the same reliability as the operating system, this design idea puts forward high requirements for application development, but also requires the operating system itself to be open enough.

PROGRAMMABLE CONTROLLER (PC). Different from the PC of the personal computer, expressed by PLC.

PLC is in the traditional sequence controller based on the introduction of microelectronics technology, computer technology, automatic control technology and communication technology to form a new generation of industrial control devices, the purpose is to replace the relay, the implementation of logic timing, counting and other sequence control functions, to establish a flexible program control system. The Electrotechnical Commission (IEC) has issued regulations for PLCS: A programmable controller is an electronic system operated by digital arithmetic, designed for use in industrial environments. It uses a programmable memory to store instructions for performing operations such as logic operations, sequence control, timing, counting and arithmetic operations, and to control various types of machinery or production processes through digital and analog inputs and outputs. The programmable controller and its related equipment should be designed according to the principle that it is easy to form a whole with the industrial control system and easy to expand its functions.

CPU is the core of PLc, plays the role of the nerve center, each PLC has at least one CPU, it receives and stores the program and data according to the function given by the PLC system program, collects the status or data sent by the field input device by scanning, and stores it in the specified register, at the same time, Diagnose the working status of power supply and LC internal circuits and syntax errors during programming. After entering the operation, the instructions are read from the user program memory one by one, and the corresponding control signals are generated according to the tasks specified in the instructions after analysis to command the relevant control circuits.

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