TU810V1 3BSE013230R1 ABB

For a system with the same number of i/o points,the cost of using plc is lower than that of dcs(about 40%can be saved).PLC does not have a dedicated operating station,and the software and hardware it uses are common,so the maintenance cost is much lower than that of dcs.If the controlled object is mainly equipment chain and relatively few loops,it is more appropriate to use PLC.

If it is mainly analog control and there are many function operations,it is best to use dcs.dcs is much better than plc in terms of redundancy of controllers,i/o boards,communication networks,etc.,some advanced operations,and special requirements of the industry.Because plc adopts general monitoring software,it is easier to design the management information system of the enterprise.

相同i/o点数的系统，用plc比用dcs，其成本要低一些（大约能省40%左右）。plc没有专用操作站，它用的软件和硬件都是通用的，所以维护成本比dcs要低很多。如果被控对象主要是设备连锁、回路相对很少，采用plc较为合适。

如果主要是模拟量控制、并且函数运算很多，最好采用dcs。dcs在控制器、i/o板、通讯网络等的冗余方面，一些高级运算、行业的特殊要求方面都要比plc好的多。plc由于采用通用监控软件，在设计企业的管理信息系统方面，要容易一些。