描述
用PLC实现对系统的控制是非常方便的。这是因为:首先PLC控制逻辑的建立是程序,用程序代替硬件接线。编程序比接线,更改程序比更改接线,当然要方便得多!
其次PLC的硬件是高度集成化的,已集成为种种小型化的模块。而且,这些模块是配套的,已实现了系列化与规格化。种种控制系统所需的模块,PLC厂家多有现货供应,市场上即可购得。所以,硬件系统配置与建造也非常方便。
正因如此,用可编程序控制器才有这个”可”字。对软件讲,它的程序可编,也不难编。对硬件讲,它的配置可变,而且也易于变。
具体地讲,PLC有五个方面的方便:
(1)配置方便:可接控制系统的需要确定要使用哪家的PLC,那种类型的,用什么模块,要多少模块,确定后,到市场上定货购买即可。
(2)安装方便:PLC硬件安装简单,组装容易。外部接线有接线器,接线简单,而且一次接好后,更换模块时,把接线器安装到新模块上即可,都不必再接线。内部什么线都不要接,只要作些必要的DIP开关设定或软件设定,以及编制好用户程序就可工作。
(3)编程方便:PLC内部虽然没有什么实际的继电器、时间继电器、计数器,但它通过程序(软件)与系统内存,这些器件却实实在在地存在着。其数量之多是继电器控制系统难以想象的。即使是小型的PLC,内部继电器数都可以千计,时间继电器、计数也以百计。而且,这些继电器的接点可无限次地使用。PLC内部逻辑器件之多,用户用起来已不感到有什么限制。唯一考虑的只是入出点。而这个内部入出点即使用得再多,也无关紧要。大型PLC的控制点数可达万点以上,哪有那么大的现实系统?若实在不够,还可联网进行控制,不受什么限制。PLC的指令系统也非常丰富,可毫不困难地实现种种开关量,以及模拟量的控制。PLC还有存储数据的内存区,可存储控制过程的所有要保存的信息。……总之,由于PLC功能之强,发挥其在控制系统的作用,所受的限制已不是PLC本身,而是人们的想象力,或与其配套的其它硬件设施了。
欧美品牌停产的,常用的“PLC”备品备件
我司产品应用于以下领域:
1,《发电厂DCS监控系统》
2,《智能平钢化炉系统制造》
3,《PLC可编程输送控制系统》
4,《DCS集散控制系统》
5,《智能型消防供水控制系统》
6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。
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