英语翻译First PLC controllers were simple devices.They connected inputs such as switches,digital sensors,etc,and based on internal logic they turned output devices on or off.When they first came up,they were not quite suitable for complicated con

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英语翻译First PLC controllers were simple devices.They connected inputs such as switches,digital sensors,etc,and based on internal logic they turned output devices on or off.When they first came up,they were not quite suitable for complicated con
英语翻译
First PLC controllers were simple devices.They connected inputs such as switches,digital sensors,etc,and based on internal logic they turned output devices on or off.When they first came up,they were not quite suitable for complicated controls such as temperature,position,pressure,etc.However,throughout years,makers of PLC controllers added numerous features and improvements.Today’s PLC controller can handle highly complex tasks such as position control,various regulations and other complex applications.The speed of work and easiness of programming were also improved.Also,modules for special purposes were developed,like communication modules for connecting several PLC controllers to the net.Today it is difficult to imagine a task that could not be handled by a PLC.
Central Processing Unit (CPU) is the brain of a PLC controller.CPU itself is usually one of the microcontrollers.Aforetime these were 8-bit microcontrollers such as 8051,and now these are 16-and 32-bit microcontrollers.Unspoken rule is that you’ll find mostly Hitachi and Fujicu microcontrollers in PLC controllers by Japanese makers,Siemens in European controllers,and Motorola microcontrollers in American ones.CPU also takes care of communication,interconnectedness among other parts of PLC controllers,program execution,memory operation,overseeing input and setting up of an output.PLC controllers have complex routines for memory checkup in order to ensure that PLC memory was not damaged (memory checkup is done for safety reasons).Generally speaking,CPU unit makes a great number of check-ups of the PLC controller itself so eventual errors would be discovered early.You can simply look at any PLC controller and see that there are several indicators in the form.of light diodes for error signalization.
System memory (today mostly implemented in FLASH technology) is used by a PLC for a process control system.Aside form.this operating system it also contains a user program

英语翻译First PLC controllers were simple devices.They connected inputs such as switches,digital sensors,etc,and based on internal logic they turned output devices on or off.When they first came up,they were not quite suitable for complicated con
第一PLC的控制器简单的设备.他们连的投入,如开关,数字传感器等,基于内部的逻辑,他们把输出设备或关闭.当他们首先来到,他们都不太适合复杂的控制,如温度,位置,压力等,但在整个年,制造商的PLC控制器的补充,众多的功能和改进.今天的PLC控制器可以处理非常复杂的任务,如位置控制,各项规章制度和其他复杂的应用.速度的工作和易用性的节目也有改善.此外,模块特殊用途的开发,如通信模块连接几个PLC的控制网.今天,这是很难想象的任务,不能处理的一个PLC .
中央处理单元（ CPU ）是大脑中一个PLC控制器.CPU的本身通常是其中的微控制器.aforetime这些都是8位微控制器,如8051 ,而现在,这些都是16位和32位微控制器.潜规则是,你会发现大多是日立和fujicu微控制器在PLC控制器,由日本厂商,西门子在欧洲控制器,微控制器和摩托罗拉公司在美国的.的CPU也照顾沟通,相互关联,其中的其他部分的PLC控制器,执行程序,记忆体的运作,监督的投入和成立一个输出.PLC的控制器有复杂的例行检查记忆体,以确保PLC的记忆是没有损坏（内存检查,是为安全理由） .一般来说,CPU的单位作出了大量的检查身体的PLC控制器本身,使最终的错误会被发现的早期.您可以简单地看看在任何PLC控制器,并看到有几个指标的形式.光二极管的错误signalization .
系统记忆体（今日大多实施的Flash技术）是用一PLC的过程控制系统.除了形式.此作业系统,它也包含了用户程序

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第一个PLC控制器是简单设备。他们连接了输入例如开关、数字式传感器等等和基于内部逻辑他们转动输出设备开关。当他们首先过来，他们不相当适用于复杂的控制例如温度、位置、压力等等。然而，在几年期间， PLC控制器制造商增加了许多特点和改善。 Today’s PLC控制器可能处理高度复杂任务例如职位控制、各种各样的章程和其他复杂应用。和从容也改进了工作的编程的速度。并且，专用的模块被发展了，象连接的几个PLC控制器通信模块到网。今天想象不可能由PLC处理的任务是难的。
Central处理器(CPU)是PLC控制器的脑子。 CPU通常是其中一个微型控制器。早先这些是8位微型控制器例如8051，并且现在这些是16和32位微型控制器。未说出口的规则是you’ll发现在PLC控制器的主要日立和Fujicu微型控制器由日本制造商，在欧洲控制器和Motorola微型控制器的西门子在美国人一个。 CPU也采取通信关心，互联性在PLC控制器中的其他部分，程序执行，存储操作，监督输入和设定产品。 PLC控制器有记忆核对的复杂惯例为了保证未损坏PLC记忆(记忆核对因安全上的原因完成)。一般来说， CPU单位做很大数量的核对PLC控制器，因此及早将发现最后的错误。您能看所有PLC控制器和看到有几显示以形式。错误信号通知的轻的二极管。 (今天主要实施在一刹那技术) PLC使用System记忆为一个程序控制的系统。在旁边形式。这操作系统它也包含一个用户程序

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