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IC693ALG391

IC693ALG391

大型PLC的應用領域多為產值高的產業(yè)，這些產業(yè)對于產線設備的風險控管嚴格，雖然PLC發(fā)展已有30余年，技術已經相當成熟，因此價格已經穩(wěn)定偏低，即使如AB、西門子等大廠牌，縱使市場報價較一般廠商高出一截，但就整體自動化設備而言，其成本比例仍不算高，而另一方面當這些大廠再為其產線投保時，若使用非知名品牌的PLC，保險公司在風險考量下，也會調高保費，兩相考量下，這些產業(yè)業(yè)者在成本支出不多的考量下，仍傾向採用高知名度品牌的PLC，臺灣廠商要切入大型PLC市場，在企業(yè)規(guī)模無法與外商抗衡下，臺灣廠商切入不易。

除了應用產業(yè)外，在相關技術上，中、大型PLC也正在逐步蠶食較不復雜的DCS與SCADA的應用，擴大了整個市場的大餅，對于大型工業(yè)用戶而言，以PLC為基礎的自動化方案愈來愈受歡迎，一來因為PLC的穩(wěn)定可靠與現(xiàn)成可用性確實眾所周知，二來有經驗的PLC專業(yè)人才確實比較容易找到。

至于幾年前一度來勢洶洶的PC-based控制器，現(xiàn)在看來則似乎不容易再對PLC的地位構成威脅，吳順裕認為有兩個塬因，首先是，PLC廠商其實已經把PC-based技術融入PLC當中，用來提供更多新的功能，這樣一來，PC-based控制器當然很難切入PLC既有的市場，另一個塬因則是基礎的架構不同，PLC一開始就是為了自動化控制而設計，因此其架構會特別貼近自動化底層設備，如馬達、變頻器等，但PCBased則是從PC而來，自動化控制只是后來所加上去的功能，因此在與上述的這些底層設備的溝通介面，設計的并不理想，在大型PLC上面，雖然PCBased控制器對上層架構溝通較佳，但這些溝通介面，現(xiàn)在PLC都已可做到，再加上PLC塬有的穩(wěn)定優(yōu)勢，更是讓PCBased難以跨入大型自動化架構。

最后再從PLC廠商來看，從記者採訪過程中，各自動化產業(yè)工程師認知度最高的PLC品牌，包括了日本叁菱、歐姆龍、德商西門子及美商洛克威爾(AB)，此外法國施耐德、美國GEFanuc、日本的富士、松下、臺灣的永宏、豐煒、臺達等品牌也有相當的支持度，雖然樣本有限，以上的結果僅能供作參考，未必完全符合業(yè)界的真實狀況，但似乎也可反映出部分工程師對市場的一般印象。

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