MDD090C-030-N2M-110PAO國內(nèi)PLC生產(chǎn)廠約三十家，但沒有形成頗具規(guī)模的生產(chǎn)能力和名牌產(chǎn)品，還有一部分是以仿制、來件組裝或“貼牌”方式生產(chǎn)，因此可以說PLC在我國未形成制造產(chǎn)業(yè)。作為原理、技術(shù)和工藝均無尖端技術(shù)難度的產(chǎn)品，只要努力，是能形成制造產(chǎn)業(yè)的。
PLC的市場的潛力是巨大的，不僅在我國，即使在工業(yè)發(fā)達(dá)的日本也有調(diào)查表明，PLC配套的機(jī)電一體化產(chǎn)品的比例占42%，采用繼電器、接觸器控制尚有24%。所以說，需要應(yīng)用PLC的場合還很多，在我國就更是如此了。
MDD090C-030-N2M-110PAO從技術(shù)創(chuàng)新的角度看，我國大中型企業(yè)還要大力發(fā)展CIMS，在機(jī)械制造廠要形成FMS柔性制造系統(tǒng)，PLC是基礎(chǔ)，所以PLC市場是廣闊的。
PLC具有穩(wěn)定可靠、價(jià)格便宜、功能齊全、應(yīng)用靈活方便、操作維護(hù)方便的優(yōu)點(diǎn)，這是它能持久的占有市場的根本原因，我們下面重點(diǎn)闡述幾個(gè)問題，并研究其發(fā)展趨勢。
PLC的硬件和軟件
PLC在90年代已經(jīng)形成微、小、中、大、巨型多種PLC。按I/O點(diǎn)數(shù)分，可分為：
微型PLC： 32 I/O
小型PLC： 256 I/O
中型PLC：1024 I/O
大型PLC：4096 I/O
巨型PLC：8195 I/O
(注：近年來有單機(jī)支持300回路和65000點(diǎn)I/O的大型系統(tǒng))
MDD090C-030-N2M-110PAO對應(yīng)中型PLC以上，均采用16位~32位CPU，微、小型PLC原采用8位CPU，現(xiàn)在根據(jù)通訊等方面要求，有的也改用16位~32位CPU。由于I/O 64點(diǎn)以下PLC銷售額占整個(gè)PLC的47%，64點(diǎn)~256點(diǎn)的占31%，合計(jì)位整個(gè)PLC銷售額的78%，所以對微、小型PLC應(yīng)多加研究。
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