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，**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**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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Weiss Instruments Pressure Gauge, 3.9" Diameter, 0-100PSI, 1/4"NPT
Weiss Instruments Pressure Gauge, 3.9" Diameter, 0-100PSI, 1/4"NPT
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Westinghouse 1F2190 Transformer 230/460P 115/230S 0.5kVA Type MTA
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Westinghouse 308P614 AC Motor, 1/4HP, 1725HP, 115V, 3.*mp, 60Hz, 1 Phase
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資訊來源：福州卓凱電子科技有限公司
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