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1756-L61/B處理器模塊
輸入數(shù)據(jù)轉(zhuǎn)變輸入模塊對輸入模擬信號進(jìn)行模數(shù)轉(zhuǎn)換12位分辨率（即4096中的1部分）。這意味著輸出代碼對應(yīng)于略大于滿量程的0.024%。
下圖是用于繪制模擬輸入的粗粒度轉(zhuǎn)換圖以原始二進(jìn)制格式輸出到PC的等效數(shù)值。
這個所示示例顯示了1.25 V（5 V FSR的25%）的輸入電壓和通過455斜線投影的1024個數(shù)字（4200的25%）。使用以下比例方程計算精確值：其中，F(xiàn)SR是模擬輸入（包括雙極）的滿標(biāo)度范圍，F(xiàn)CR是滿標(biāo)度原始二進(jìn)制格式的計數(shù)范圍（4200）。
格式轉(zhuǎn)變該模塊能夠?qū)?shù)字化數(shù)據(jù)以任何一種原始二進(jìn)制形式呈現(xiàn)給PC（RB）或轉(zhuǎn)換的二進(jìn)制（CB）格式。每種情況下的位模式都不同。
這個格式是開關(guān)可選的，每組輸入電路的格式不必相同。
Modicon程序員將以三種不同的方式之一顯示任一類型的數(shù)據(jù)：二進(jìn)制、十六進(jìn)制或十進(jìn)制形式。
轉(zhuǎn)變精確該模塊的轉(zhuǎn)換線性為滿量程的0.05%–參考直線穿過測量滿標(biāo)度值和測量零點的線–超過模塊的工作溫度范圍。
原始二進(jìn)制（RB）格式輸入信號數(shù)字化后，輸入模塊顯示RB格式的數(shù)據(jù)。
在十進(jìn)制表示法中，RB格式的數(shù)據(jù)必須在0至4200范圍。通常，12位設(shè)備的數(shù)據(jù)上限為4095。
該模擬模塊具有允許輸入超過范圍2%的方法以相同的分辨率（即，原始二進(jìn)制中的計數(shù)可以達(dá)到4200）。
在RB格式中，無論電壓范圍如何，數(shù)據(jù)范圍都是相同的。
轉(zhuǎn)換二進(jìn)制（CB）格式CB通過轉(zhuǎn)換RB格式獲得在模塊中。當(dāng)PC或程序員以十進(jìn)制查看CB數(shù)據(jù)時模式下，它看起來像一個沒有符號或小數(shù)點的4位數(shù)字電壓表（DVM）。在CB格式中，上限和下限數(shù)據(jù)取決于電壓范圍。因為缺少符號，CB格式僅用于單極電壓范圍。
下圖顯示了原始二進(jìn)制輸出的示例。
當(dāng)5 V信號為通過設(shè)置為0至10V范圍的模塊進(jìn)行數(shù)字化，它生成一個轉(zhuǎn)換的二進(jìn)制代碼0800十六進(jìn)制或2048十進(jìn)制。
原始二進(jìn)制字格式
下圖顯示了轉(zhuǎn)換后的二進(jìn)制格式的條件1388十六進(jìn)制或5000十進(jìn)制。轉(zhuǎn)換的二進(jìn)制字格式
Input Data Conversion
The input module performs an analog-to-digital conversion of an input analog signal with 12 bit resolution (i.e., 1 part in 4096). This implies that the least significant bit of the output code corresponds to slightly more than 0.024% of full scale. The following illustration is a coarse grain conversion chart for plotting analog input against the equivalent numerical value output to the PC in raw binary format. The example illustrated shows an input voltage of 1.25 V (25% of 5 V FSR) and a numerical count of 1024 (25% of 4200) as projected through the 455 slope line. Calculate exact values using the following proportional equation: Where FSR is full scale range for analog input (including bipolar) and FCR is full count range (4200) in a raw binary format.
Format Conversion
The module is capable of presenting the digitized data to the PC in either raw binary (RB) or converted binary (CB) format. The bit pattern in each case is different. The format is switch selectable and need not be the same for each group of input circuits. A Modicon programmer will display either type of data in one of three different ways: binary, hexadecimal, or decimal form. Conversion Accuracy Conversion linearity for this module is 0.05% of full scale–referenced to a straight line drawn through the measured full-scale value and the measured zero point–over the module’s operating temperature range. Raw Binary (RB) Format After digitizing the input signal, the input module presents data in RB format. In decimal representation, data in RB format must be within the 0 to 4200 range. Normally, a 12--bit device would have an upper data limit of 4095.
This analog module
has the means of allowing the input to be up to 2% over-range at the same resolution (i.e., the count in raw binary may go up to 4200). In RB format, the data range is the same regardless of the voltage range. Converted Binary (CB) Format CB is obtained by transforming the RB format within the module. When CB data is viewed by the PC or programmer in decimal mode, it looks like a 4-digit voltmeter (DVM) with no sign or decimal point. In CB format, upper and lower data limits are voltage range dependent. Because of the missing sign, CB format is used only for unipolar voltage ranges. The following figure shows an example of raw binary output. When a 5 V signal is digitized by the module set for 0 to 10 V range, it produces a converted binary code 0800 hex or 2048 decimal. Raw Binary Word Format The following figure shows the conditions in converted binary format which produce 1388 hex or 5000 decimal. Converted Binary Word Format
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