P0400ZB IPM2，P0400ZB IPM2，P0400ZB IPM2
數(shù)據(jù)在存儲器中存取的方式
1．位、字節(jié)、字和雙字
二進(jìn)制數(shù)的1位（bit）只有0和1兩種不同的取值，可用來表示開關(guān)量（或稱數(shù)字量）的兩種不同的狀態(tài)，如觸點的斷開和接通，線圈的通電和斷電等。如果該位為1，則表示梯形圖中對應(yīng)的編程元件的線圈“得電”，其常開觸點閉合、常閉觸點斷開，以后稱該編程元件為1狀態(tài)，或稱該編程元件ON。反之亦反。
8位二進(jìn)制數(shù)組成1個字節(jié)（Byte），其中的第0位為最低位（LSB），第7位為最高位（MSB）。兩個字節(jié)組成1個字（Word），兩個字組成1個雙字。
2．?dāng)?shù)據(jù)的存取方式
（1）“位”存取方式：位存儲單元的地址由字節(jié)地址和位地址組成，如I3.2，其中的區(qū)域標(biāo)識符“I”表示輸入（Input），字節(jié)地址為3，位地址為2。如圖：
這種存取方式稱為“字節(jié)·位”尋址方式。
（2）“字節(jié)”存取方式：輸入字節(jié)IB3（Byte）由I3.0~I3.7這8位組成。
（3）“字”存取方式：相鄰的兩個字節(jié)組成一個字，一個字中的兩個字節(jié)的地址必須連續(xù)，且低位字節(jié)在一個字中應(yīng)該是高8位，高位字節(jié)在一個字中應(yīng)該是低8位。IW14表示由IB14和IB15組成的1個字，IW14中的I為區(qū)域標(biāo)識符，W表示字（Word），14為起始字節(jié)的地址。IW14中的IB14應(yīng)該是高8位，IB15應(yīng)該是低8位。
（4）“雙字”存取方式：相鄰的四個字節(jié)表示一個雙字，四個字節(jié)的地址必須連續(xù)。最低位字節(jié)在一個雙字中應(yīng)該是最高8位。ID12表示由IB12~IB15組成的雙字，I為區(qū)域標(biāo)識符，D表示存取雙字（Double Word），12為起始字節(jié)的地址。ID12中的IB12應(yīng)該是最高8位
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