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3BUR001455R1數(shù)字輸出模塊
模塊可以接線以接受以下類型的包：電流輸入類型；電壓輸入類型；RTD輸入類型；線性熱電偶輸入類型；應(yīng)變計/載荷單元格輸入類型。下面討論這些輸入類型及其連接。參考下圖顯示了電流輸入的典型現(xiàn)場電路連接。電流輸入的典型現(xiàn)場電路連接，如圖A所示，每個電流輸入中必須安裝精度為20Ω的可熔電阻器頻道易熔電阻器隨每個4-20 mA或0-20 mA輸入包提供。B875-200可安裝在下沉或源配置中。每個通道都是浮動的。如果你需要場地，你可以在場地的一邊打平手接線至底盤接地或使用屏蔽線，屏蔽線與底盤接地相連。參考注意低帶寬電流輸入（AS-5B32）
選擇要用于當(dāng)前輸入包的通道。選擇電流輸入通過將輸入組件與組件旁邊的熔斷電阻器一起插入適當(dāng)?shù)那?。電流輸入?yún)⒖嫉湫偷默F(xiàn)場電路連接將現(xiàn)場側(cè)接線連接到現(xiàn)場適當(dāng)?shù)牟迥_時，如上圖所示連接器。注：所有輸入包提供從總線到現(xiàn)場接線的1500 Vac/2500 Vdc隔離。由于任何浮動輸入可能會暴露于高達(dá)15 kV的靜電荷，直接或通過電阻范圍為1kW-10MW。在端子1、2、39處使用底盤接地或40.如果與輸入一起使用的信號源具有到機箱接地的直流信號路徑，
現(xiàn)場接線的B875端不需要額外的路徑。
注：通道獨立設(shè)置。上述任何包裝類型均可混雜在一起。低帶寬和寬帶電壓輸入注意接收電壓輸入的通道。電壓輸入由選插入相應(yīng)通道的輸入包。參考下圖，并將現(xiàn)場側(cè)接線連接至現(xiàn)場連接器上的適當(dāng)引腳。
電壓輸入的典型現(xiàn)場電路連接圖
注：電壓寬帶寬輸入包對噪聲更加敏感
在輸入行上。建議將低帶寬包用于通用輸入電壓使用。
注：建議使用所示的屏蔽類型。信號源的一側(cè)可能使用雙絞線時，應(yīng)連接至底盤接地。
注：通道獨立設(shè)置。電流、電壓、RTD、線性的任何混合物熱電偶或應(yīng)變計/稱重傳感器可用作輸入。注意指定接收RTD輸入的通道。RTD輸入由選擇插入相應(yīng)通道的輸入包。請參閱下圖和將現(xiàn)場側(cè)接線連接到現(xiàn)場連接器上的適當(dāng)引腳。
RTD輸入的典型現(xiàn)場電路連接圖
Low and Wide Bandwidths Voltage Inputs
The module may be wired to accept the following types of packs: current input type; voltage input type; RTD input type; linear thermocouple input type; strain gauge/load cell input type. These input types and their connections are discussed below. Refer to the diagram showing the typical field circuit connections for current inputs, below. Typical field circuit connections for current inputs, diagram A precision 20 Ω fusible resistor must be installed in each current input channel. The fusible resistor is supplied with each 4 - 20 mA or 0 - 20 mA input pack. The B875-200 may be installed in either the sinking or sourcing configuration.Each channel is floating. Should you need a ground, you may tie one side of field wiring to chassis ground or use shield wiring with shield tied to chassis ground. Refer to note Note the channels to receive the voltage inputs. Voltage inputs are selected by inserting the input pack for the appropriate channel. Refer to the following drawing, and connect field-side wiring to the proper pins on the field connector. Typical field circuit connections for voltage inputs, diagram NOTE: Voltage wide bandwidth input packs are significantly more sensitive to noise on input lines. Low bandwidth packs are recommended for general purpose input voltage usage. NOTE: The shield-type shown is recommended. One side of the signal source may be connected to chassis ground when using twisted pair wiring. NOTE: Channels are set independently. Any mixture of current, voltage, RTD, linear thermocouple, or strain gauge/load cell may be used as inputs.
Low Bandwidth Current Inputs (AS-5B32)
Select the channels to be used for current input packs. Current inputs are selected by inserting the input pack, together with a fusible resistor beside the pack, for the appropriate channel. Refer to the typical field circuit connections for current inputs diagram, above, while connecting the field-side wiring to the proper pins on the field connector. NOTE: All input packs provide 1500 Vac/2500 Vdc isolation from bus to field wiring. Since any floating inputs may be exposed to static charges as high as 15 kV, connect one of the signal input leads to chassis ground either directly or through a resistor in the range of 1kW—10MW. Use the chassis ground at terminals 1, 2, 39 or 40. If the signal source used with an input has a dc signal path to chassis ground, no additional path is required at the B875 end of the field wiring. NOTE: Channels are set independently. Any of the pack types identified above can be intermixed.
