FCS現場總線卡 ，FCS現場總線卡 ，FCS現場總線卡
S7-200PLC的數據區
（一）數字量輸入和輸出映象區
1．輸入映象寄存器（數字量輸入映象區）（I）
數字量輸入映象區是S7-200CPU為輸入端信號狀態開辟的一個存儲區。輸入映像寄存器的標識符為I，在每個掃描周期的開始，CPU對輸入點進行采樣，并將采樣值存于輸入映像寄存器中。
輸入映像寄存器是PLC接收外部輸入的開關量信號的窗口。
可以按位、字節、字、雙字四種方式來存取。
（1）按“位”方式：從I0.0~I15.7，共有128點
（2）按“字節”方式：從IB0~IB15，共有16個字節
（3）按“字”方式：從IW0~IW14，共有8個字
（4）按“雙字”方式：從ID0~ID12，共有4個雙字
2．輸出映像寄存器（Q）
數字量輸出映象區是S7-200CPU為輸出端信號狀態開辟的一個存儲區。輸出映像寄存器的標識符為Q（從Q0.0~Q15.7，共有128點），在每個掃描周期的末尾，CPU將輸出映像寄存器的數據傳送給輸出模塊，再由后者驅動外部負載。
可以按位、字節、字、雙字四種方式來存取。
（1）按“位”方式：從Q0.0~I15.7，共有128點
（2）按“字節”方式：從QB0~QB15，共有16個字節
（3）按“字”方式：從QW0~QW14，共有8個字
（4）按“雙字”方式：從QD0~QD12，共有4個雙字
說明：實際沒有使用的輸入端和輸出端的映象區的存儲單元可以作中間繼電器用。
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