EI813F 3BDH000022R1 ABB

The design,construction and commissioning cycle is short-to complete a control project with relay-contactor control,you must first draw the electrical schematic diagram according to the process requirements,and then draw the layout and wiring diagram of the relay screen(cabinet)for installation and commissioning.,it is very inconvenient to modify it later.PLC control is used,because it is controlled by software,the hardware circuit is very simple,and it is a modular building block structure,and it has been commercialized,so it only needs to be assembled according to performance,capacity(input and output points,memory size),etc.A large number of specific programming work can also be carried out before the PLC arrives,thus shortening the design cycle,so that design and construction can be carried out at the same time.Because the software programming replaces the hard wiring to realize the control function,the heavy installation and wiring work is greatly reduced,and the construction period is shortened.PLC completes control tasks through programs,adopts user-friendly industrial programming language,and has the functions of forcing and simulation,so program design,modification and debugging are very convenient,which can shorten the design and commissioning cycle.

设计、施工、调试周期短——用继电器—接触器控制完成一项控制工程，必须首先按工艺要求画出电气原理图，然后画出继电器屏（柜）的布置和接线图等，进行安装调试，以后修改起来十分不便。而采用PLC控制，由于其靠软件实现控制，硬件线路非常简洁，并为模块化积木式结构，且已商品化，故仅需按性能、容量（输入输出点数、内存大小）等选用组装，而大量具体的程序编制工作也可在PLC到货前进行，因而缩短了设计周期，使设计和施工可同时进行。由于用软件编程取代了硬接线实现控制功能，**减轻了繁重的安装接线工作，缩短了施工周期。PLC是通过程序完成控制任务的，采用了方便用户的工业编程语言，且都具有强制和仿真的功能，故程序的设计、修改和调试都很方便，这样可**缩短设计和投运周期。