產(chǎn)品內(nèi)容介紹
1756-PA72/C交流電源模塊
設(shè)置輸入平均投資可以補(bǔ)償雜散噪聲和其他形式的振幅通過制作最新輸入樣本來通過模擬輸入濾波器的調(diào)制移動(dòng)平均值的一部分&數(shù)字濾波的一種形式。這種移動(dòng)平均技術(shù)對(duì)更新間隔沒有影響。
下表顯示了用于在七個(gè)輸入平均值中進(jìn)行選擇的Sw–B設(shè)置8和4電路配置的采樣周期。
除平均采樣外，Sw–B還具有其他功能；開關(guān)B7設(shè)置為ON對(duì)于二進(jìn)制代碼輸出或?qū)τ贏組的十進(jìn)制代碼輸出為OFF（輸入1-48電路模式和4電路模式中的輸入1-2）。開關(guān)B8的作用相同對(duì)于B組，由于模塊在出廠時(shí)經(jīng)過校準(zhǔn)，設(shè)計(jì)者的意圖是10 V參考電壓調(diào)整將有效一年。它應(yīng)該是此后每年重新校準(zhǔn)。
需要以下工具來調(diào)整模塊的參考電壓：精度為0.0001 V、電壓為10 V的精密數(shù)字讀數(shù)伏特計(jì)
刻度：6-1/2位，保證4位計(jì)數(shù)精度。
一把1/8英寸的薄刃螺絲刀。
一把小頭十字螺絲刀。用粘合劑（如Loctite或Glyptol）固定微調(diào)電位器調(diào)整螺釘注意：在重新校準(zhǔn)過程中，現(xiàn)場(chǎng)接線可能會(huì)保持連接，因?yàn)槟K的工作狀態(tài)和參考電壓調(diào)整不相互影響。
模塊不需要預(yù)熱即可達(dá)到溫度。使用下表安裝模塊。
步驟操作
1從裝運(yùn)箱中取出模塊并檢查是否損壞。如果發(fā)現(xiàn)損壞，請(qǐng)聯(lián)系分銷商（或銷售人員）正確的返回程序。
2確保從外殼上斷開電源。
3按如下方式配置開關(guān)組A：A-1至A-6適用于預(yù)期八或四電路配置的預(yù)期輸入電壓范圍A7選擇八路或四路輸入模式。A8至ON，用于正常操作。
4按如下方式配置交換機(jī)組B：B-1至B-6，適用于八或四電路配置的所需輸入平均樣本數(shù)上面指定的。B7選擇輸出代碼格式
5如果使用鍵銷（隨外殼裝運(yùn)提供），則將其安裝在為此選擇的外殼槽的上方和下方模塊的安裝。
6打開手柄，將模塊插入外殼，將邊緣連接器牢牢固定在底板上。
7使用模塊前面板頂部和底部的固定安裝螺釘固定模塊。
8參考下面的現(xiàn)場(chǎng)連接器/輸入電路引腳分配圖。將現(xiàn)場(chǎng)側(cè)接線連接到雙現(xiàn)場(chǎng)連接器（位于（位于左側(cè)、前緣），根據(jù)需要鋪設(shè)成扇形的電纜。注：使用現(xiàn)場(chǎng)連接器接線尺寸AWG-20（含）（實(shí)心或絞合）。
9如果正在使用電流檢測(cè)輸入電路，將現(xiàn)場(chǎng)連接器上的相應(yīng)電流檢測(cè)端子跨接至相應(yīng)的熱輸入（+），如下面的現(xiàn)場(chǎng)連接器/輸入電路引腳分配圖所示。
注：應(yīng)終止未使用的輸入，以減少因浮動(dòng)輸入而產(chǎn)生的電氣噪聲和其他干擾線將未使用的電壓和電流端子（包括屏蔽）跨接至外殼接地。外殼接地僅為如果H8XX外殼接地，則有效。屏蔽的兩端不能連接到設(shè)備和模塊，除非設(shè)備屏蔽是設(shè)備輸入電路的一部分，并且未在內(nèi)部連接到設(shè)備外殼接地。
注意：
如果需要超范圍和欠范圍檢測(cè)，并且此檢測(cè)會(huì)導(dǎo)致吞吐量問題未使用的通道（因?yàn)樗鼈兏?dòng)或峰值超出范圍），然后未使用的電壓或電流通道現(xiàn)場(chǎng)連接器應(yīng)與有效輸入通道并聯(lián)。只要有效通道保持在范圍內(nèi)，綁定頻道也將保持在范圍內(nèi)。
注：對(duì)于4-20 mA范圍內(nèi)的電流，只有有效輸入需要包含250? 電阻器。
10參考下面的現(xiàn)場(chǎng)連接器安裝圖。用針腳1將兩個(gè)有線現(xiàn)場(chǎng)連接器安裝在模擬模塊上位于頂部，現(xiàn)場(chǎng)接線位于左側(cè)。
11關(guān)閉模塊手柄。
12如果需要，打開殼體電源。
注：如果在電壓模式下操作時(shí)出現(xiàn)斷路，輸入可能需要幾秒鐘才能衰減至零，由于前端RC網(wǎng)絡(luò)。如果需要開路檢測(cè)，模塊應(yīng)在當(dāng)前模式。添加250? 電阻器迫使RC網(wǎng)絡(luò)快速放電
Setting Input Averaging
It is possible to compensate for spurious noise and other forms of amplitude modulation coming through the analog input filter by making the latest input sample part of a moving average–a form of digital filtering. This moving average technique has no affect upon the update interval. The following tables show Sw–B setting for selecting among seven input average sample periods for both 8 and 4 circuit configurations. Sw–B has other functions in addition to average sampling; Switch B7 is set to ON for binary code output or OFF for decimal code output for Group A (inputs 1-4 in the 8 circuit mode and inputs 1-2 in the 4 circuit mode). Switch B8 does the same for Group B.Since the module is shipped factory-calibrated, it is the designer’s intention that the 10 V reference voltage adjustment will be good for one year. It should be recalibrated annually thereafter. The following tools are needed to adjust the module’s reference voltage: A precision digital readout voltmeter with an accuracy of 0.0001 V on a 10 V scale: 6-1/2 digits, to guarantee 4 bit count accuracy. A 1/8-inch bit, thin-blade screwdriver. A small-bit Phillips-head screwdriver. An adhesive (such as Loctite or Glyptol) to secure trim-pot adjustment screws Note: Field wiring may remain connected during the recalibration procedure, as the module’s working state is not interactive with the reference voltage adjustment. Also, the module does not require warmup to attain temperature.
Use the following table to install the module.
Step Action 1 Remove module from shipping box and check for damage. If damage found, contact distributor (or sales person) for correct return procedure. 2 Ensure that power is removed from housing. 3 Configure switch bank A as follows: A-1 through A-6 for desired input voltage ranges appropriate to the intended eight- or four-circuit configuration A7 to select eight- or four-circuit input mode. A8 to ON for normal operation. 4 Configure switch bank B as follows: B-1 through B-6 for desired number of input averaging samples appropriate to eight- or four-circuit configuration designated above. B7 to select output code format 5 If using key pins (provided with housing shipment), install them above and below housing slot selected for this module’s installation. 6 Open handle and insert module into housing, firmly seating edge connector in backplane. 7 Secure module using captive mounting screws at top and bottom of module’s front panel. 8 Refer to field connector/input circuit pinout diagram, below. Connect field side wiring to double field connector (located on left side, front edge), laying in cable fan-out as desired.
NOTE:
Use field connector wiring sizes AWG—20 inclusive (solid or stranded). 9 If current sense input circuit(s) is being used, jumper appropriate current sense terminal on field connector to corresponding hot input (+) as shown in field connector/input circuit pinout diagram, below. NOTE: Unused inputs should be terminated to reduce electrical noise and other interference due to floating input lines. Jumper unused voltage and current terminals (including shields) to case ground. Case ground will only be effective if H8XX housing is connected to earth ground. Both ends of the shield cannot be connected to the device and module, unless the device shield is part of the device input circuit, and is not connected internally to the device case ground. NOTE: If over-range and under-range detection is required, 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. NOTE: For currents within the range of 4—20 mA, only the valid input requires the inclusion of the 250 ? resistor. 10 Refer to field connector mounting drawing, below. Mount two wired field connectors on analog module with pin 1 positioned at top and field wiring to left. 11 Close module handle. 12 Turn on power to housing if desired. NOTE: If an open circuit occurs when operating in the voltage mode, the input may take several seconds to decay to zero, due to the front-end RC network. If open-circuit detection is required, the module should be operated in the current mode. The addition of the 250 ? resistor forces the RC network to discharge rapidly
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