產(chǎn)品內(nèi)容介紹
1756-A7/B機(jī)架
PC輪詢模塊并將值放入輸入寄存器（30XXX）由程序員指定。每次模塊通電時(shí)，它都會(huì)執(zhí)行診斷測(cè)試，重置輸入鎖存器，并且對(duì)于每個(gè)信道，向控制器呈現(xiàn)值0000。價(jià)值通電后約三秒鐘。然后模塊將啟動(dòng)根據(jù)B873-002和B875-002中的計(jì)劃轉(zhuǎn)換輸入吞吐量，第163頁(yè)。模塊后部有一個(gè)DIP開關(guān)。開關(guān)1和2不習(xí)慣于開關(guān)3可以設(shè)置為模塊復(fù)位或模塊運(yùn)行。
它必須設(shè)置為模塊運(yùn)行位置，用于模塊操作。開關(guān)4用于設(shè)置哪些數(shù)據(jù)模塊將生成的值范圍。
選擇正常范圍或升高范圍在將模塊插入住房有關(guān)設(shè)置DIP開關(guān)的鍵，請(qǐng)參閱下圖。
安裝單元從盒子中取出模塊并檢查是否損壞。如果發(fā)現(xiàn)損壞，請(qǐng)聯(lián)系您的銷售人員或分銷商了解正確的退貨程序。
將開關(guān)3設(shè)置為模塊運(yùn)行位置，將開關(guān)4設(shè)置為數(shù)據(jù)范圍在將模塊插入住房（參考開關(guān)設(shè)置，第155頁(yè)）。模塊中包括一個(gè)模擬連接器組件（B873的部件號(hào)AS-8533-001-002和B875-002的零件號(hào)AS-8533-002）。
連接器套件包括兩個(gè)安裝螺釘、一個(gè)導(dǎo)線管和其中一個(gè)（B873-002）或兩個(gè)（B875-002）現(xiàn)場(chǎng)接線連接器。每個(gè)連接器有18個(gè)嵌入式開槽螺釘端子，可接受各種線規(guī)，但16至20建議現(xiàn)場(chǎng)接線使用儀表。如果超范圍或欠范圍檢測(cè)對(duì)您的流程很重要，并且檢測(cè)導(dǎo)致未使用通道的吞吐量問(wèn)題（因?yàn)樗鼈兏?dòng)或峰值超出范圍）
現(xiàn)場(chǎng)連接器應(yīng)并聯(lián)至有效的輸入通道。
只要有效通道保持在范圍內(nèi)，綁定通道也將保持在范圍之內(nèi)。
對(duì)于電流，4至20ma操作，有效輸入是唯一需要250電路中的歐姆電阻器。
當(dāng)H8XX殼體連接到接地時(shí)，殼體接地有效。
屏蔽兩端不能連接到設(shè)備和模塊。這個(gè)例外情況是設(shè)備屏蔽是設(shè)備輸入電路的一部分內(nèi)部未連接到設(shè)備外殼接地。B873-012和B875-012是模擬輸入模塊，可與984一起使用可編程控制器。這兩個(gè)模塊之間的唯一區(qū)別是B873-012有四個(gè)輸入通道，B875-012有八個(gè)輸入通道。
兩個(gè)模塊都接受-10至+10伏模擬信號(hào)的輸入。輸入已轉(zhuǎn)換到一個(gè)數(shù)值，范圍從0001到8191。0000或8192表示無(wú)效數(shù)據(jù)。（參考數(shù)據(jù)值參考圖）該值直接與輸入信號(hào)成比例。例如，-5V的輸入電壓會(huì)導(dǎo)致模塊發(fā)送值2048。如果輸入信號(hào)變?yōu)?V，模塊發(fā)送值6144。（請(qǐng)參閱輸入到輸出數(shù)據(jù)轉(zhuǎn)換表。）
The PC polls the module and places
the values into input registers (30XXX) designated by the programmer. Each time the module is powered up, it performs diagnostic tests, resets the input latches, and, for each channel, presents a value of 0000 to the controller. The value is present for approximately three seconds after power up. The module will then start converting the inputs according to the schedule found in the B873-002 & B875-002 Throughput Rate, p. 163.
There is a DIP switch located at the rear of the module. Switches 1 and 2 are not used. Switch 3 can be set to either Module Reset or Module Run. It must set to the Module Run position for the module to operate. Switch 4 is used to set which data value range the module will produce. Select either Normal Range or Elevated Range. Make sure you set Switch 3 and 4 before inserting the module into the housing. Refer to the figure below for a key to setting the DIP switch.
Installing the Module
Remove the module from the box and check for damage. If damage is found, contact your salesman or distributor for correct return procedure. Set switch three to the Module Run position, and Switch four to the data range selected for input - either Standard or Elevated - before inserting the module into the housing. (Refer to Switch Settings, p. 155).Included with the module is an Analog Connector Set (Part# AS-8533-001 for B873- 002 and Part# AS-8533-002 for B875-002). The Connector Set consists of two mounting screws, a wire duct, and either one (B873-002) or two (B875-002) field wiring connectors. Each connector has eighteen recessed slotted screw terminals and can accept various wire gauges, but 16 to 20 gauge is recommended for the field side wiring.If Over-range or Under-range detection is important to your process, and this detection is causing throughput problems with the unused channels (because they float or spike outside the range), then the unused voltage or current channels at the field connector, should be connected in parallel, to a valid Input channel. As long as the valid channel stays within range, the tied channels will also stay within range. For Current, 4 to 20ma operation, the valid Input is the only Input requiring the 250 Ohm resistor to be in the circuit. Case ground is effective when the H8XX housing is connected to earth ground. The shield cannot be connected, both ends, to the device and the module. The exception to this is where the device shield is part of the device input circuit, and is not connected internally to device case ground.
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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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