【正文】
有些較小的 PLC控制器從與 PLC控制器集成在一起的小電源為它們的輸入提供電壓源。不同的模塊使用不同的電流量。 電源是為中央處理單元提供電源的。注釋和標記甚至還可以準確地引用零件號,如果需要更換零件的話。 幾乎所有用于為 PLC控制器編程的程序都擁有各種不同的選項,例如系統(tǒng)輸入 /輸出( I/O線)的強制開關(guān),程序?qū)崟r跟蹤以及圖表驗證。這對于工業(yè)企業(yè)來說是非常重要的。例如,定時器值,或者記數(shù)器值存放在存儲器的這個部分。一部分存儲器用來存儲輸入和輸出狀態(tài)。 PLC控制器比快擦型存儲器使用得更早, EPROM存儲器比快擦型存儲器也更早,快擦型存儲器必須用紫外線( UV, UltraViolet Ray)燈擦除,并在編程器上進行編程。 CPU速度和內(nèi)存容量是 PLC的重要參數(shù),它們決定著 PLC的工作速度, IO數(shù)量及軟件容量等,因此限制著控制規(guī)模。 CPU的控制器控制 CPU工作,由它讀取指令、解釋指令及執(zhí)行指令。 提供 所譯外文資料附件(印刷類含封面、封底、目錄、翻譯部分的復(fù)印件等,網(wǎng)站類的請附網(wǎng)址及原文 】 英文節(jié)選原文: Central Processing Unit (CPU) is the brain of a PLC controller. CPU itself is usually one of the microcontrollers. Aforetime these were 8bit microcontrollers such as 8051, and now these are 16and 32bit 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 munication, interconnectedness among other parts of PLC controllers, program execution, memory operation, overseeing input and setting up of an output. PLC controllers have plex 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 checkups 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 erro