IC693CPU331W IC693CPU331W
在低檔PLC中,用Z80A做CPU較為廣泛,Z80A用于PLC有如下長處: Z80(或Z80A)CPU及其配套的芯片便宜、遍及、通用,用這套芯片制成的PC,給維修及推廣遍及帶來方便。Z80有獨立的輸入/輸出指令,并且指令款式較短,實行時間也較短,如許有利于掃描周期的收縮。Z80輸入/輸出指令款式較短,相應的輸入/輸出設置裝備擺設編碼也較短,以是相應的譯碼硬件器較簡樸。由于Z80的信息是接納輸入/輸出映射方法,因而計劃流步伐時,對輸入/輸出與存儲器尋址容易區別。
②用單片機作CPU
自從1974年出現單片機以來,已有不少產品接納單片機做可編步伐控制器。日本三菱F系列PLC就接納美PLCINTEL公司MES-48系列的單片機8049和8039做處置處罰器,8039單片機在一塊電影上集成了8位的CPU,1288的數據存儲器。27條輸入/輸出線,T0、T1、INT測試線及8位定時器/計數器,時鐘振蕩電路等。
自80年月以來,出現了集成度更高。功效更強,并帶有“布爾機”而又便于作數據通訊的MCS-51系列單片機以及功效更高的16位單片機,大有代替MCS-48系列之勢。日本三菱的F2系列PLC即接納CPU8031。MCS-51系列單片機是美PLCINTEL公司在MCS-48單片機底子上,于80年月初推出的產品,具有高集成度、高可靠性、高功效、高速率、低代價等特點。它有三個代表產品:8051、8751和8031,它們分別有差別的應用特性。8051因此4K字節EPR0M代替4K字節的R0M的8051; 8031是內部無R0M8051。必須外接EPR0M;INTEL公司的96系列的單片機,字長為16,運算速率比51系列更高,這必將為高等次的PLC開辟和應用帶來優美的遠景。用單片機制成的PLC有以下明顯特點:為機電設置裝備擺設一體化創造了條件,由于由單片機制成PLC,體積更小。同時PLC邏輯功效很強,并且具有數值運算和通訊接口。
③用位片衰落處置處罰器作CPU
位片衰落處置處罰器的重要特點是:速率快、機動性強、服從高等特點。可以舉行“級聯”,易于“流水線”操縱。
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黃華新
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注:聯系我時,請說是在“傲立機床網”上看到的,謝謝!