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PLC可編程控制器模塊，DCS卡件，ESD系統(tǒng)卡件，振動監(jiān)測系統(tǒng)卡件，汽輪機(jī)控制系統(tǒng)模塊，燃?xì)獍l(fā)電機(jī)備件等，優(yōu)勢品牌：Allen Bradley、BentlyNevada、ABB、Emerson Ovation、Honeywell DCS、Rockwell ICS Triplex、FOXBORO、Schneider PLC、GE Fanuc、Motorola、HIMA、TRICONEX、Prosoft等各種進(jìn)口工業(yè)零部件、歐美進(jìn)口模塊。
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382D719G06電源驅(qū)動器
I/O映射如果設(shè)置為8個差動輸入，則模塊類型為B875，需要8個連續(xù)3xxxx二進(jìn)制寄存器。如果設(shè)置為16個單端輸入，則模塊類型為B877，需要16個連續(xù)的3xxxx二進(jìn)制寄存器。
注：通電后，模塊的活動指示燈快速閃爍，顯示已建立與可編程控制器的通信，但返回的輸入數(shù)據(jù)無效。（4000十六進(jìn)制發(fā)送到控制器初始化期間）。模塊初始化完成且輸入有效時
當(dāng)數(shù)據(jù)正在傳輸時，指示燈或穩(wěn)定亮起，或緩慢閃爍任何輸入都超出范圍。導(dǎo)線輸入B875–111和B877–111需要高密度連接器，零件號AS–8535–000。請參閱模塊左側(cè)的引出線。請參閱以下內(nèi)容插圖0-10 V輸入示例。模塊檢查B875–111和B877–111將在輸入。模數(shù)轉(zhuǎn)換的分辨率取決于輸入使用配置開關(guān)組選擇的范圍和輸出格式。
使用程序員調(diào)用I/O映射中指定的相應(yīng)寄存器。
變化輸入信號，并檢查寄存器內(nèi)容是否正確變化。
快速啟動示例請參閱下表。應(yīng)用在許多應(yīng)用中，模擬信號以單位（點(diǎn)、加侖/秒、攝氏度、英尺/分鐘等）監(jiān)視或報告打印輸出。模擬輸入可以縮放為工程單位。
為了演示該技術(shù)，假設(shè)快速啟動示例中的0-10 V信號
表示-40-+140°F的溫度。請參閱下圖顯示信號與溫度的關(guān)系。
信號與溫度關(guān)系圖
z工程單位范圍是多少？在本例中，它是140-（-40）=180
z用計算器將這個數(shù)字除以7500。180/7500 = .024
z將此數(shù)字乘以10000，得到乘法塊常數(shù)240。
z將模擬輸入乘以240。高階結(jié)果寄存器將包含范圍z加上或減去Y截距（本例中為-40）以獲得答案。
I/O Mapping
If setup for 8 differential inputs, the module type will be a B875 and requires 8 consecutive 3xxxx binary registers. If setup for 16 single ended inputs, the module type will be a B877 and require 16 consecutive 3xxxx binary registers. NOTE: Upon power-up the module’ s active indicator flashes rapidly showing that communication with the programmable controller has been established but, that the input data being returned is not valid. (4000 Hexadecimal is sent to the controller during the initialization time). When module initialization is complete, and valid input data is being transferred, the indicator is either steady on, or flashing slowly when any input is out-of-range. Wire Inputs The B875–111 and B877–111 require a high-density connector, part number AS– 8535–000. Refer to the left side of the module for pinouts. Refer to the following illustration. 0—10 V input example.
Module Checkout
The B875–111 and B877–111 will perform an analog to digital conversion on the inputs. The resolution of the analog to digital conversion is dependent upon the input range and output format selected with the configuration switch bank. Using a programmer, call up the appropriate registers assigned in the I/O Map. Vary the input signal and check that the register content varies correctly. Refer to the following table for the quick-start example.
Application
In many applications, analog signals are provided to operators in units (points, gallons per second, degrees C, feet per minute, etc.) via LED displays, CRT monitors or report printouts. An analog input can be scaled to engineering units. To illustrate the technique, assume that the0—10 V signal in the quick-start example represents a temperature from -40—+140°F. Refer to the following illustration showing the signal to temperature relationship. Signal to temperature relationship diagram z What is the engineering unit range? In this example it is 140 - (-40) =180 z Divide this number by 7500 using a calculator. 180/7500 = .024 z Multiply this number by 10,000 to obtain the multiply block constant of 240. z Multiply the analog input by 240. The high-order result register will contain the range. z Add or subtract the Y intercept (-40 in this example) to obtain the answer.
