相同i/o點數(shù)的系統(tǒng)，用plc比用dcs，其成本要低一些(大約能省40%左右)。plc沒有專用操作站，它用 的軟件和硬件都是通用的，所以維護成本比dcs要低很多。如果被控對象主要是設(shè)備連鎖、回路相對很少，采用plc較為合適。如果主要是模擬量控制、并且函 數(shù)運算很多，最好采用dcs。dcs在控制器、i/o板、通訊網(wǎng)絡(luò)等的冗余方面，一些高級運算、行業(yè)的特殊要求方面都要比plc好的多。plc由于采用通 用監(jiān)控軟件，在設(shè)計企業(yè)的管理信息系統(tǒng)方面，要容易一些。

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