產(chǎn)品內(nèi)容介紹
PM864AK01 3BSE018161R1控制處理器
B872-100 4通道模擬（D/A）輸出模塊轉(zhuǎn)換數(shù)字數(shù)據(jù)
范圍從0000到4095，電流范圍從4到20 mA（12位分辨率）。該模塊設(shè)計為允許您控制每個輸出通道的狀態(tài)當可編程控制器復位或停止時。
通道的輸出可以保持最后一個值（HOLD）或轉(zhuǎn)到0.0 mA（返回默認值：零：RTZ）。
您可以使用四個位置為四個隔離輸出中的每一個選擇此選項DIP開關(guān)。開關(guān)與每個輸出關(guān)聯(lián)（開關(guān)1用于輸出1，等等）。
這個HOLD或RTZ功能由您選擇，以滿足您的特定應(yīng)用。
RTZ功能允許您將輸出歸零作為一項安全功能。
HOLD公司函數(shù)允許您在OURBUS丟失后保持最后一個有效輸出值表達該模塊有四個獨立的模擬輸出，并且能夠更新所有四個通道每1毫秒。12位分辨率和絕對精度為+/-0.1%25°C可精確控制您的應(yīng)用。
下圖顯示了B872-100模塊的簡化示意圖。B872接受0000到4095之間的數(shù)據(jù)值并將其轉(zhuǎn)換輸出電流為4至20 mA。輸出電流與數(shù)據(jù)值加上4 mA。有關(guān)要輸出的數(shù)據(jù)值，請參閱下圖轉(zhuǎn)換圖表。
交換機位置和位置四位DIP開關(guān)位于模塊后部。此開關(guān)控制系統(tǒng)復位或停止時每個通道的狀態(tài)。
輸出通道可以保持最后一個值（保持）或轉(zhuǎn)到0.0 mA歸零（RTZ）。
在安裝模塊之前，將開關(guān)設(shè)置為保持或RTZ。
每個四個開關(guān)控制其相關(guān)輸出的操作模式（即開關(guān)1輸出1等）。
開關(guān)設(shè)置下圖顯示了B872-100模塊的DIP開關(guān)設(shè)置。
而且請參閱模塊左側(cè)的標簽。模擬輸出模塊在出廠前進行校準。
為了確保為了保證模塊的精度，您應(yīng)該定期校準每個輸出的微調(diào)罐。
對于25-45°C之間的操作，建議每隔12個月進行一次校準以及0-60°C之間的6個月間隔。
校準模擬輸出模塊需要以下工具：
1） 編程面板
2） 精密電壓表，精度為+/-0.0001伏，10伏刻度
3） 一把1/4英寸十字螺絲刀
4） 一把1/8英寸標準螺絲刀
The B872-100 4-Channel Analog (D/A) Output Module
converts numerical data ranging from 0000 to 4095 into current ranging from 4 to 20 mA (12-bit resolution). The module is designed to allow you to control the state of each output channel when the programmable controller is reset or stopped. The output of the channel can either remain at the last value (HOLD) or go to 0.0 mA (return to default: zero: RTZ). You can select this option for each of the four isolated outputs using a four-position DIP switch. A switch is associated with each output (switch 1 for output 1, etc.). The HOLD or RTZ function is selected by you to meet your specific application. The RTZ function allows you to bring the outputs to zero as a safety feature. The HOLD function allows you to maintain the last valid output value after the loss of OURBUS communication. The module has four isolated analog outputs, and is capable of updates to all four channels every 1 mS. The 12-bit resolution and the absolute accuracy of +/-0.1% at 25 °C provides precise control of your application. The following figure shows the simplified schematic of the B872-100 module.The B872 accepts data values ranging from 0000 to 4095 and converts them into output currents of 4 to 20 mA. The output current is directly proportional to the data value plus 4 mA. Refer to the figure below for a data value to output conversion chart.
Switch location and position
The four position DIP-switch is located on the rear of the module. This switch controls the state of each channel when the system is reset or stopped. The output to the channel can either remain at the last value (Hold) or go to 0.0 mA Return-ToZero (RTZ). Set the switch for either hold or RTZ prior to installation of the module. Each of the four switches control the mode of operation for its associated output (i.e., switch 1 for output 1, etc.). Switch Settings The following figure presents DIP switch settings for the B872-100 module. Also, refer to the label located on the left side of the module itself.The Analog Output module is calibrated at the factory prior to shipment. To ensure the module's accuracy you should calibrate the trim-pots for each output regularly. Calibration is recommended at 12 month intervals for operation between 25-45 °C and at 6 month intervals between 0-60 °C.
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