產品內容介紹
1756-A7/B機架
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，它都會執(zhí)行診斷測試，重置輸入鎖存器，并且對于每個信道，向控制器呈現(xiàn)值0000。價值通電后約三秒鐘。然后模塊將啟動根據(jù)B873-002和B875-002中的計劃轉換輸入吞吐量，第163頁。模塊后部有一個DIP開關。開關1和2不習慣于開關3可以設置為模塊復位或模塊運行。
它必須設置為模塊運行位置，用于模塊操作。開關4用于設置哪些數(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設置DIP開關的鍵，請參閱下圖。
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3設置為模塊運行位置，將開關4設置為數(shù)據(jù)范圍在將模塊插入住房（參考開關設置，第155頁）。模塊中包括一個模擬連接器組件（B873的部件號AS-8533-001-002和B875-002的零件號AS-8533-002）。
連接器套件包括兩個安裝螺釘、一個導線管和其中一個（B873-002）或兩個（B875-002）現(xiàn)場接線連接器。每個連接器有18個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)場接線使用儀表。如果超范圍或欠范圍檢測對您的流程很重要，并且檢測導致未使用通道的吞吐量問題（因為它們浮動或峰值超出范圍）
現(xiàn)場連接器應并聯(lián)至有效的輸入通道。
只要有效通道保持在范圍內，綁定通道也將保持在范圍之內。
對于電流，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H8XX殼體連接到接地時，殼體接地有效。
屏蔽兩端不能連接到設備和模塊。這個例外情況是設備屏蔽是設備輸入電路的一部分內部未連接到設備外殼接地。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。這兩個模塊之間的唯一區(qū)別是B873-012有四個輸入通道，B875-012有八個輸入通道。
兩個模塊都接受-10至+10伏模擬信號的輸入。輸入已轉換到一個數(shù)值，范圍從0001到8191。0000或8192表示無效數(shù)據(jù)。（參考數(shù)據(jù)值參考圖）該值直接與輸入信號成比例。例如，-5V的輸入電壓會導致模塊發(fā)送值2048。如果輸入信號變?yōu)?V，模塊發(fā)送值6144。（請參閱輸入到輸出數(shù)據(jù)轉換表。）
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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