1746-NR8  A-B罗克韦尔 RTD热电阻输入模块

1746-NR8  A-B罗克韦尔 RTD热电阻输入模块

1746-NR8 是电阻温度检测器 （RTD） /电阻模块。该模块接受来自 RTD 传感器的电阻信号，例如铂 （385） 100、200、500 和 1000;铂金 （3816） 100、200、500 和 1000;铜 （426） 10、镍 （618） 120、镍 （672） 120 和镍铁 （518） 604，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 2的两（500）种变体，例如固定和模块化硬件样式。它占用任何使用的机箱的单个插槽，不需要外部电源，此模块由系统电源产生的背板电源供电。

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。该模块的电阻能力适用于测量位移或运动或机械设备。通常，它用于测量行程长度，通过阻力读数的减少和增加反映的运动。

该模块支持 2 线、3 线和 4 线 RTD 传感器。对于 2 线 RTD，推荐的电线是 Belden 9501 屏蔽电缆或同等电线。对于 3 线或 4 线 RTD，请使用百通 9533 或百通 83503 电缆。对于 2 线 RTD，请避免长电缆敷设，因为这会降低测量精度。这是无法避免的，通过使用较低规格的电缆（例如AWG #16电线而不是AWG #24）可以最大程度地减少影响或长电线。基本上，使用每英尺电阻较低的电缆。可拆卸接线端子 （RTB） 的端子仅用于单线连接。

通道状态可通过 LED 指示灯监控，而模块运行可通过 LED 状态指示灯监控。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。该模块的模数转换是Σ-Δ调制。每次模块上电时都会发生其自动校准过程，也可以编程为每 5 分钟的特定周期。1746-NR8 模块上的 RTD 类型是铜、铂、镍铁和镍。与此模块兼容的接线端子是艾伦-布拉德利 1746-RT-35 接线端子。

1746-NR8 模块的背板功耗最大为 1.82 W，0 伏直流时功耗为 5.5 W，1 伏直流时功耗为 32.24 W。1746-NR8 的背板电流消耗在 100 伏直流时为 5 mA，在 55 伏直流时为 24 mA。其最大共模电压为 +/- 1 伏，而其最大永久过载为 +/- 5 mA 电流和 +/- 5 伏直流电。1746-NR8 模块的隔离电压在通道之间以 5 伏直流电压连续，在输入和背板之间以及输入和机箱接地之间以 500 伏交流电持续 1 分钟。其工作温度范围为 32 至 140 华氏度，存储温度范围为 -40 至 185 华氏度，非冷凝相对湿度为 5% 至 95%。

1746-NR8  A-B罗克韦尔 RTD热电阻输入模块

The 1746-NR8 is a resistance temperature detector (RTD)/resistance module. The 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 have direct resistance values of 0-150 ohms, 0 to 500 ohms, 0 to 1000 ohms and 0 to 300 ohms.

This module is specifically designed for SLC 500 systems. It can be used specifically for two (500) variants of SLC 2, such as fixed and modular hardware styles. It occupies a single slot in any used chassis and does not require an external power supply, this module is powered by the backplane power supply generated by the system power supply.

The module is mainly used for temperature applications, as the RTD sensor is specifically used to measure temperature readings. The resistance capability of the module is suitable for measuring displacement or motion or mechanical devices. Typically, it is used to measure stroke length by reducing and increasing resistance readings to reflect movement.

The module supports 2-wire, 3-wire, and 4-wire RTD sensors. For 2-wire RTDS, the recommended wire is the Belden 9501 shielded cable or equivalent. For 3-wire or 4-wire RTDS, use a Belton 9533 or Belton 83503 cable. For 2-wire RTDS, avoid long cable laying as this will reduce measurement accuracy. This is unavoidable and can be minimized by using a lower specification cable (e.g. AWG #16 wire instead of AWG #24). Basically, use a cable with a lower resistance per foot. Detachable terminal (RTB) terminals are only used for single-wire connections.

Channel status can be monitored by LED indicators, while module operation can be monitored by LED status indicators. The module has a low-pass digital filter and a programmable input filter. The analog-to-digital conversion of this module is sigma-δ modulation. Its automatic calibration process occurs every time the module is powered on and can also be programmed for a specific cycle every 5 minutes. The RTD types on the 1746-NR8 module are copper, platinum, nickel-iron, and nickel. The terminal compatible with this module is the Allen-Bradley 1746-RT-35 terminal.

The backplane of the 1746-NR8 module has a maximum power consumption of 1.82 W, 5.5 W at 0 V DC, and 32.24 W at 1 V DC. The backplane current consumption of 1746-NR8 is 5 mA at 100 volts DC and 24 mA at 55 volts DC. Its maximum common-mode voltage is +/ -1 volt, while its maximum permanent overload is +/ -5 mA current and +/ -5 volts DC. The isolation voltage of the 1746-NR8 module is continuous at 5 volts DC between channels and 500 volts AC for 1 minute between input and backplane and between input and chassis ground. Its operating temperature range is 32 to 140 degrees Fahrenheit, storage temperature range is -40 to 185 degrees Fahrenheit, and non-condensing relative humidity is 5 to 95 percent.

1746-NR8  A-B罗克韦尔 RTD热电阻输入模块

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