描述
PLC硬件和軟件的進展
PLC硬件和軟件的進展，從系統(tǒng)上講是實現(xiàn)小型化、高速化，以及將信息技術(shù)滲入PLC；從硬件上講是，采用32位RISC的MPU、專用的LSI和多CPU；從軟件上講則是，采用與國際標準IEC 61131-3相對應的日本工業(yè)標準JIS B 3503。小型化 由于日本電子工業(yè)尤以器件、電路板等硬件見長，所以在PLC系統(tǒng)上實現(xiàn)小型化，可以說最早就是起源于日本，又由他們來推動，并一直樂此不疲、貫徹至今的。小型化的好處是：節(jié)省空間、安裝靈活、降低成本。現(xiàn)今日本主要PLC廠商生產(chǎn)的模塊式中、大型PLC，其典型的外形尺寸要比他們在前一代的同類產(chǎn)品的安裝空間要小50-60%。例如三菱電機的小Q系列就比AnS系列的安裝空間減少60%。要做到這一點，首先需要開發(fā)大規(guī)模的專用集成電路芯片（ASIC）來減少芯片的個數(shù)，并采用球柵陣列（BGA）以保證在同樣封裝尺寸下能提供足夠多的針腳數(shù)。例如，某CPU模塊原來用了約700個元器件，通過開發(fā)了12種大規(guī)模的ASIC（采用BG352的針腳封裝）和調(diào)整功能，減少了顯示用的LED和開關(guān)等措施，使元器件減少了一半左右。其次，為減少接插件在印刷電路板上所占的空間，要求接插件的針腳間隔足夠小。再次，隨著微細加工技術(shù)的發(fā)展，印刷電路板上的接線布局可實現(xiàn)高密度化、多層化和薄型化，大大提高了元器件的安裝率。例如某CPU模塊采用了1毫米厚的基板制成8層電路板。由于采取了以上這些措施，使CPU模塊由3塊印刷電路板變?yōu)?塊，體積減少了70%，小型化得以較完美地實現(xiàn)。隨著小型化又產(chǎn)生了如何解決小空間的散熱設計問題：一是要根據(jù)熱分析仿真來確定元器件的布置安排；二是主要元器件的電源電壓采用3.3V，達到低功耗的目的；三是考慮了通過安裝模塊的基板，使模塊所產(chǎn)生的熱量能得到良好散熱的機械結(jié)構(gòu)。高速化 所謂高速化應該包括：運算速度的高速化；與外部設備的數(shù)據(jù)交換速度高速化，如I/O刷新和網(wǎng)絡刷新等；編程設備服務處理的高速化；外部設備的高速響應。
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