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PLC可編程控制器模塊，DCS卡件，ESD系統(tǒng)卡件，振動(dòng)監(jiān)測(cè)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(shì)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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89NU03A-E驅(qū)動(dòng)板
輸入選擇首先，找到模塊左側(cè)的四個(gè)檢修孔。這些孔允許訪(fǎng)問(wèn)三個(gè)四位和一個(gè)五位DIP開(kāi)關(guān)。
接下來(lái)，設(shè)置底部五位DIP開(kāi)關(guān)的開(kāi)關(guān)位置5（SW5模塊左側(cè)的檢修孔，用于選擇輸入范圍。此開(kāi)關(guān)必須對(duì)應(yīng)八位模塊配置DIP的開(kāi)關(guān)位置8（SW8轉(zhuǎn)換SW5和SW8設(shè)置必須相同。
注：對(duì)于開(kāi)關(guān)SW5，輸入范圍如下：z對(duì)于10 V（10 V或0-10 V），將SW5放置在左側(cè)。
z對(duì)于5 V（所有其他），將SW5放置在右側(cè)。有兩種方法可以配置模塊以接受當(dāng)前輸入。有8個(gè)差動(dòng)電流/電壓輸入模塊稱(chēng)為B875-111。有16個(gè)單端電流/電壓輸入模塊稱(chēng)為B877-111。B875-111現(xiàn)場(chǎng)連接為八個(gè)差動(dòng)電流輸入配置B875-111時(shí)，請(qǐng)注意將接收這些輸入的通道。通過(guò)放置正極電壓輸入和電流之間的磁場(chǎng)連接器上的跳線(xiàn)相應(yīng)通道的輸入端子。例如，如果通道2要接收電流輸入，必須在端子#7（CH2）和端子#6之間跳線(xiàn)電流輸入CH2），如下圖所示。
下圖顯示了B875的簡(jiǎn)化示意圖–111模塊。B875–111模擬輸入模塊
電流輸入數(shù)據(jù)示例圖注：
DIP開(kāi)關(guān)可訪(fǎng)問(wèn)性在差速模式和應(yīng)保留在出廠(chǎng)安裝的電壓輸入位置。
注：在以下情況下，可以同時(shí)存在電流和電壓輸入
條件：
z 1-5伏和4-20毫安
z 0-5 V和0-20 mA
z 5和20 mA將現(xiàn)場(chǎng)側(cè)接線(xiàn)連接至現(xiàn)場(chǎng)連接器上的適當(dāng)引腳。電壓輸入不需要現(xiàn)場(chǎng)連接器上的跳線(xiàn)。請(qǐng)參閱顯示典型現(xiàn)場(chǎng)電路連接，見(jiàn)下文。注意：開(kāi)路電壓輸入可能正或負(fù)漂移。如果需要開(kāi)路檢測(cè)，應(yīng)使用電流輸入。使用電壓時(shí)輸入，如果大值電阻器（2 MΩ或更大）放置在正極（+）和負(fù)極（-）輸入之間的現(xiàn)場(chǎng)連接器上。這個(gè)如果磁場(chǎng)連接斷開(kāi)。電流輸入通過(guò)設(shè)置可通過(guò)側(cè)面訪(fǎng)問(wèn)的DIP開(kāi)關(guān)進(jìn)行選擇用于接收輸入的每個(gè)通道的蓋子。DIP開(kāi)關(guān)的精度為250Ω正極輸入和模擬回路之間的電阻。
位于左側(cè)的開(kāi)關(guān)組4上的第五個(gè)開(kāi)關(guān)（SW5）選擇電壓范圍此開(kāi)關(guān)的位置必須與模塊配置的位置相同開(kāi)關(guān)SW8，位于模塊后部。請(qǐng)參閱左側(cè)的標(biāo)簽?zāi)K側(cè)面，以及下面顯示單端輸入（B877）的當(dāng)前設(shè)置的圖示。單端輸入的電流設(shè)置，圖（B877）
Input Selection
First, locate the four access holes on the left side of the module. These holes allow access to three four-position and one five-position DIP switch. Next, set switch position 5 (SW5) of the five-position DIP switch found in the bottom access hole on the left side of the module, to select the input range. This switch must correspond to switch position 8 (SW8) of the eight-position module configuration DIP switch. SW5 and SW8 settings must be identical. NOTE: For switch SW5, the input ranges are as follows: z For 10 V (10 V or 0—10 V) place SW5 to the left. z For 5 V (all others) place SW5 to the right.There are two ways to configure the module to accept current inputs. With eight differential current/voltage inputs the module is called the B875-111. With sixteen single-ended current/voltage inputs the module is called the B877-111.
Connect field-side wiring to proper pins on the field connector. Voltage inputs do not require a jumper on the field connector. Refer to the illustration showing the typical field circuit connections, below. NOTE: Open-circuit voltage inputs may drift either positive or negatively. If opencircuit detection is required, a current input should be used. When using voltage inputs, an open circuit can be detected if a large-value resistor (2 MΩ or greater) is placed at the field connector across the positive (+) and negative (-) inputs. The resistor clamps the channel to a small offset voltage (<100 mV) if the field connections are broken.
B875-111 field connections
When configuring the B875-111 for eight differential current inputs, note the channels that will receive these inputs. Current inputs are selected by placing a jumper on the field connector between the positive voltage input and the current input terminal for the appropriate channel. For example, if channel 2 is to receive a current input, a jumper must be made between terminal #7 (CH2) and terminal #6 current input CH2), as shown on the following illustration. The following illustration represents the simplified schematic diagram for the B875– 111 module. B875–111 analog input module, current input dxample drawing NOTE: DIP switch accessibility DIP switches accessible through the side cover are not used in differential mode and should be left in the factory-installed voltage input positions. NOTE: Simultaneous current and voltage inputs can exist under the following conditions: z 1—5 V and 4—20 mA z 0—5 V and 0—20 mA z 5 and 20 mA
