描述

1746-NI8 模擬單槽I/O模塊

Allen-Bradley 1746-NI8是SLC 500系統(tǒng)的模擬單槽I/O模塊。它適用于需要快速模擬信號轉換和高精度的時間敏感應用。1746-NI8模塊具有8通道輸入和隔離背板。在5伏直流電和24伏直流電下，背板電流消耗分別為200mA和100mA。它的最大背板功耗在5伏直流時為1瓦，在24伏直流時為2.4瓦。1746-NI8可以安裝在SLC 500 I/O機箱除0號槽位外的任何I/O槽位上。輸入信號數(shù)據(jù)通過逐次逼近轉換轉換為數(shù)字數(shù)據(jù)。1746-NI8模塊使用可編程濾波器頻率和低通數(shù)字濾波器進行輸入濾波。它執(zhí)行連續(xù)自動校準，隔離電壓為750伏直流和530伏交流，測試60秒。它的共模電壓范圍為-10 ~ 10伏，任意兩個端子之間的最大共模電壓為15伏。

1746-NI8模塊配有18個位置的可拆卸端子塊。對于布線，必須使用Belden 8761或類似的電纜，每個終端有一根或兩根14awg線。電纜在電壓源處的最大回路阻抗為40歐姆，在電流源處的最大回路阻抗為250歐姆。有9個綠色LED狀態(tài)指示燈，用于故障處理和診斷。8個通道各有一個顯示輸入狀態(tài)的指示燈，各有一個顯示模塊狀態(tài)的指示燈。1746-NI8具有二級危險環(huán)境標準，工作溫度為0至60攝氏度。

1746-NI8具有八(8)通道模擬輸入模塊，適用于SLC 500固定或模塊化硬件風格控制器。該模塊來自Allen-Bradley，具有單獨可選的電壓或電流輸入通道?？晒┻x擇的輸入信號包括:電壓為10V dc, 1-5V dc, 0-5V dc, 0-10V dc，電流為0 – 20ma, 4 – 20ma， +/- 20ma。

輸入信號可以表示為工程單位，pid縮放，比例計數(shù)(-32,768至+32,767范圍)，用戶定義范圍的比例計數(shù)(僅限3類)和1746-NI4數(shù)據(jù)。

這個八(8)通道模塊兼容使用SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04和SLC 5/05處理器。SLC 5/01只能作為1級操作，而SLC 5/02、5/03、5/04可配置為1級和3級操作。每個模塊的通道可以采用單端或差分輸入方式布線。

該模塊具有可移動的端子塊，用于連接輸入信號，無需重新布線即可輕松更換模塊。輸入信號類型的選擇是使用嵌入式撥碼開關完成的。

1746-NI8 模擬單槽I/O模塊

The Allen-Bradley 1746-NI8 is an analog single-slot I/O module for the SLC 500 system. It is suitable for time-sensitive applications that require fast analog signal conversion and high accuracy. The 1746-NI8 module has an 8-Channel input with an isolated backplane. Its backplane current consumption is 200mA and 100mA at 5 Volts DC and 24 Volts DC respectively. It has a maximum backplane power consumption of 1 Watt at 5 Volts DC and 2.4 Watts at 24 Volts DC. The 1746-NI8 can be installed in any I/O slot, except Slot 0 of the SLC 500 I/O chassis. Input signal data is converted to digital data via successive approximation conversion. The 1746-NI8 module uses programmable filter frequencies with a low-pass digital filter for input filtering. It performs continuous autocalibration and has an isolation voltage of 750 Volts DC and 530 Volts AC, tested for 60 seconds. It has a common-mode voltage ranging from -10 to 10 Volts with a maximum of 15 Volts between any two terminals.

The 1746-NI8 module comes with a removable terminal block of 18 positions. For wiring, the Belden 8761 or a similar cable must be used with one or two 14 AWG wires per terminal. The cable has a maximum loop impedance of 40 Ohms at the voltage source and 250 Ohms at the current source. For troubleshooting and diagnostics, it has 9 green LED status indicators. The 8 channels have one indicator each to display the input status and one each for displaying the module status. The 1746-NI8 has a Division 2 hazardous environment standard with an operating temperature of 0 to 60 degrees Celsius.

The 1746-NI8 features Eight (8) channel analog input module compatible for used with SLC 500 Fixed or modular hardware style controllers. This module from Allen-Bradley has individually selectable voltage or current input channels. Available selectable input signals include 10V dc, 1–5V dc, 0–5V dc, 0–10V dc for Voltage while 0–20 mA, 4–20 mA, +/-20 mA for Current.

Input signals may be represented as Engineering Units, Scaled-for-PID, Proportional Counts (–32,768 to +32,767 range), Proportional Counts with User Defined Range (Class 3 only) and 1746-NI4 Data.

This Eight (8) channel module is compatible for use with SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04 and SLC 5/05 processors. SLC 5/01 may only operate as class 1 while SLC 5/02, 5/03, 5/04 are configurable for Class 1 and Class 3 operation. The channels of each module may be wired in single-ended or differential input.

This module has a removable terminal block for connection to input signals and easy replacement of module without the need of rewiring. Selection of input signal type is done with the use of embedded DIP switches.

 

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