型号：3HAC9710-1
品牌：ABB
随着我国工业技术以及计算机编程技术的不断进步,二者融合得更加频繁,并且,取得的效果也是更加理想。可编程控制器作为计算编程技术的重要成果,目前，已经在工业领域得到了广泛的应用。现今的PLC已经不再是简单的可编程控制器,其功能和作用都已经更加广泛。本文重点探索其在电力系统中的主要应用,并探索其未来的发展趋势。
一)PLC工作流程。PLC的工作流程主要包括三个阶段,第一个阶段是采样阶段。PLC利用扫描方式,对数据以及状态进行读取,进而存贮到相应的硬盘以及I/0影像区对应的单元当中。当输入工作结束之后,便开始进入到用户的程序执行阶段,此时,PLC按照由上到下的顺序进行用户程序扫描,如果遇到的是梯形图,则遵循从左至右的原则,或者是自.上而下顺序原则并进行逻辑运算,进而按照逻辑运算结果对逻辑线圈的对应状态进行刷新。最后一个阶段则是输出阶段,此时,CPU会对输出锁存电路进行刷新,并将电路驱动的相关外围设备进行输出。
With the continuous progress of industrial technology and computer programming technology, the two merge more frequently, and the effect is more ideal. As an important achievement of computational programming technology, PLC has been widely used in the industrial field. Today’s PLC is no longer a simple programmable controller, its functions and roles have been more extensive. This paper focuses on its application in power system and its future development trend.
1)PLC work flow. PLC workflow mainly includes three stages, the first stage is the sampling stage. PLC uses scanning mode, to read the data and state, and then stored to the corresponding hard disk and I/0 image area corresponding unit. When the input work is over, it begins to enter into the user’s program execution stage, at this time,PLC in accordance with the order of the user program scan, if the encounter is ladder diagram, it follows the principle from left to right, or from. The principle of top-down sequence is followed by logical operations, and the corresponding state of the logical coil is refreshed according to the results of logical operations. The last stage is the output stage. At this stage, the CPU will refresh the output latch circuit and output the related peripheral devices driven by the circuit.
