1746-NR8 slc8点电阻输入模块

Description

1746-NR8 slc8点电阻输入模块

1746-NR8是一个电阻温度检测器(RTD) /电阻模块。该模块接受来自铂金(385)100、200、500和1000等RTD传感器的电阻信号;白金(3816)100、200、500和1000;铜(426)10，镍(618)120，镍(672)120，镍铁(518)604和直接电阻值为0 – 150欧姆，0至500欧姆，0至1000欧姆和0至300欧姆。

该模块专门用于SLC 500系统。它可以专门用于SLC 500的两(2)种变体，例如固定和模块化硬件样式。该模块占用机箱的单个槽位，不需要外部供电，由系统电源产生的背板供电。

该模块主要用于温度应用，因为RTD传感器专门用于测量温度读数。该模块的抗阻能力适用于测量位移或运动或机械装置。通常，它用于测量行程长度，由电阻读数的减少和增加所反映的运动。

该模块支持2线、3线和4线RTD传感器。对于2线制RTD，建议使用Belden 9501屏蔽电缆或等效电缆。对于3线制或4线制RTD，使用Belden 9533或Belden 83503电缆。对于2线RTD，避免长电缆运行，因为它会降低测量精度。这是不可避免的，使用较低规格的电缆，如awg# 16线代替awg# 24线，可以最大限度地减少长线的影响。基本上，使用每英尺电阻较低的电缆。可移动端子座(RTB)的端子仅用于单线连接。

通过LED指示灯可以监控通道状态，通过LED状态指示灯可以监控模块运行情况。该模块具有一个低通数字滤波器和一个可编程输入滤波器。该模块的模拟到数字转换是sigma-delta调制。它的自动校准过程发生每次模块上电，也可编程到每5分钟的特定周期。1746-NR8模块上的RTD类型有铜、铂、镍铁和镍。与该模块兼容的端子排是艾伦-布拉德利1746-RT-35端子排。

1746-NR8模块背板功耗最大为1.82 W，直流5v时功耗为0.5 W，直流24v时功耗为1.32 W。1746-NR8的背板电流消耗在5伏直流时为100毫安，在24伏直流时为55毫安。其最大共模电压为+/- 1伏特，而其最大永久过载为+/- 5毫安电流和+/- 5伏特直流。1746-NR8模块的隔离电压在通道之间为5伏直流电，在输入和背板之间以及输入和机箱接地之间为500伏交流电，持续1分钟。其工作温度范围为32至140华氏度，其储存温度范围为-40至185华氏度，其非冷凝相对湿度为5%至95%。

1746-NR8

1746-NR8 slc8点电阻输入模块

The 1746-NR8 is a Resistance Temperature Detector (RTD) / Resistance module. This module accepts resistance signals from RTD sensors such as Platinum (385) 100, 200, 500 and 1000; Platinum (3816) 100, 200, 500 and 1000; Copper (426) 10, Nickel (618) 120, Nickel (672) 120, and Nickel Iron (518) 604 and direct resistance values of 0 – 150 Ohms, 0 to 500 Ohms, 0 to 1000 Ohms and 0 to 300 Ohms.

This module is exclusively used for SLC 500 systems. It may be specifically used with the Two (2) variants of SLC 500 such as Fixed and modular hardware style. It occupies single slot of any chassis used and does not require an external power supply instead, this module is powered by the backplane power generated by the system power supply.

This module is primarily used for Temperature applications as RTD sensors are specifically used to measure temperature readings. The resistance capability of this module is applicable for measuring displacement or movement or mechanical devices. Typically, it is used for measuring the length of travel, movement reflected by the decrease and increase in the resistance reading.

This module supports 2-Wire, 3-Wire, and 4-Wire RTD sensors. For a 2-wire RTD, recommended wires are Belden 9501 shielded cable or equivalent. For a 3-Wire or 4-Wire RTD, use Belden 9533 or Belden 83503 cable. For a 2-Wire RTD, avoid long cable runs as it reduces accuracy of measurement. It cannot be avoided, the effect or long wires may be minimized by using a lower gauge cable such as an AWG #16 wire instead of AWG #24. Basically, use a cable with lower resistance per foot. The terminals of the Removable Terminal Block (RTB) are intended for single wire connection only.

Channel status can be monitored via the LED indicator while the module operation can be monitored through the LED status indicator. This module has a low-pass digital filter and a programmable input filters. The module’s analog to digital conversion is sigma-delta modulation. Its auto-calibration process occurs every time the module is powered up that is also programmable to a specific cycle of every 5 minutes. The RTD types present on the 1746-NR8 module are copper, platinum, nickel-iron, and nickel. The terminal block that is compatible with this module is an Allen-Bradley 1746-RT-35 terminal block.

The backplane power consumption of the 1746-NR8 module is a maximum of 1.82 W, and the power consumption is 0.5 W at 5 Volts DC and 1.32 W at 24 Volts DC. The 1746-NR8’s backplane current consumptions are 100 mA at 5 Volts DC and 55 mA at 24 Volts DC. Its maximum common mode voltage is +/- 1 Volt, while its maximum permanent overloads are +/- 5 mA for the current and +/- 5 Volts DC. The isolation voltage of the 1746-NR8 module is continuous at 5 Volts DC between the channels and 500 Volts AC for 1 minute between the inputs and the backplane, as well as between the inputs and the chassis ground. Its operating temperature range is 32 to 140 degrees Fahrenheit, its storage temperature range is -40 to 185 degrees Fahrenheit, and its non-condensing relative humidity is 5 to 95%.