The Allen-Bradley 1746-NR4 is a versatile RTD/Resistance Analog Input Module designed for the SLC 500 control platform. This module provides four isolated input channels for direct connection to a wide range of RTD sensors, including Platinum (385 & 3916), Copper (426), Nickel (618 & 672), and Nickel Iron (518). Beyond temperature measurement, the 1746-NR4 also accepts direct resistance inputs, making it ideal for position or displacement applications. Its sigma-delta modulation ensures high accuracy, and the built-in digital filter allows for customizable noise rejection, ensuring stable readings even in electrically noisy environments.
The 1746-NR4 excels in its technical capabilities. It offers a high resolution of 0.01°C, enabling precise temperature monitoring. The module features a flexible update time that ranges from 17 milliseconds to 1.2 seconds, which you can configure to balance speed and accuracy based on your application needs. For input filtering, it uses a programmable low-pass digital filter with a bandwidth between 2.62 and 65.5 Hertz. This filter effectively minimizes signal noise. Furthermore, the module performs automatic self-calibration whenever you change the filter frequency, input type, or excitation current. This feature maintains measurement integrity without manual intervention. In addition, the 1746-NR4 uses a sigma-delta A/D conversion method to ensure high resolution and effective noise rejection.
This module supports a comprehensive list of RTD types, making it one of the most flexible options in the SLC 500 lineup. Specifically, you can use Platinum RTDs with Alpha values of 385 (100, 200, 500, 1000 Ω) and 3916 (100, 200, 500, 1000 Ω). It also supports Copper (426) 10 Ω, Nickel (618) 120 Ω, Nickel (672) 120 Ω, and Nickel Iron (518) 604 Ω. Moreover, the 1746-NR4 allows for direct resistance measurements within ranges of 0-150Ω, 0-500Ω, 0-1000Ω, and 0-3000Ω. Consequently, this module is not only for temperature but also for measuring variable resistance from devices like potentiometers or slide wires to track movement. Additionally, each channel includes broken sensor detection, which immediately flags an open or shorted circuit by displaying an out-of-range value.
The Allen-Bradley 1746-NR4 is built to withstand harsh industrial conditions. It operates reliably within a temperature range of 0°C to 60°C and can be stored safely between -40°C and 85°C. For electrical safety, the module provides 500 Volts of optical isolation for one minute between the inputs and the backplane, as well as between inputs and chassis ground. It can tolerate a maximum common-mode voltage of ±1 Volt. Furthermore, it draws 50 mA from both the 5V DC and 24V DC backplane supplies, resulting in a total power consumption of just 1.5 W. This low power draw reduces heat generation within the chassis. The module is also designed for a step response of 60 ms in and 2.5 ms out, ensuring quick reaction to signal changes.
Installing the 1746-NR4 is straightforward. You can place it in any slot of an SLC 500 chassis except for Slot 0. Remember, Slot 0 is reserved specifically for the processor or an adapter module. This module is compatible with both fixed and modular SLC 500 hardware styles. In a fixed system, you would typically use it with a 1746-A2 expansion chassis. In a modular system, you can install it in a local or remote I/O chassis. Besides its physical compatibility, it integrates seamlessly with the SLC 500 backplane, drawing power and communicating data directly. For wiring, ensure you use shielded cables to maintain signal integrity, and always ground the shield at one end to prevent ground loops. The module's LED status indicators on the front panel provide immediate visual feedback for both the module's health and the status of each of the four channels.
When you purchase the Allen-Bradley 1746-NR4, it will arrive securely packaged to prevent damage during transit. The package includes the module itself and the necessary installation instructions for proper setup. We ship all orders using premium courier services to ensure fast and reliable delivery. Additionally, our team is ready to assist you with any technical questions to ensure a smooth commissioning process.
1 x Allen-Bradley 1746-NR4 RTD/Resistance Input Module
1 x Installation Instructions Manual
We ship this product worldwide using FedEx, UPS, or DHL to ensure fast and secure delivery.
1. Can I install the 1746-NR4 in Slot 0 of my SLC 500 chassis?
No, you cannot. The 1746-NR4 is designed for any slot except Slot 0, which is exclusively reserved for the SLC 500 processor or a communication adapter module.
2. What types of RTD sensors are compatible with this module?
It supports a wide variety. Specifically, it is compatible with Platinum (385 and 3916) in 100, 200, 500, and 1000 Ω; Copper (426) 10 Ω; Nickel (618 and 672) 120 Ω; and Nickel Iron (518) 604 Ω.
3. How does the module indicate a broken or faulty sensor?
The Allen-Bradley 1746-NR4 features built-in broken sensor detection for each channel. If it detects an open or shorted circuit, the module will generate an out-of-range value, which your control system can then interpret as a fault condition.
4. What is the advantage of the sigma-delta A/D conversion method?
Sigma-delta conversion provides high resolution and excellent noise rejection. This makes the 1746-NR4 particularly effective in electrically noisy industrial environments, ensuring you get stable and accurate readings.
5. Does the 1746-NR4 require an external power supply for operation?
No, it does not. The module draws its required power directly from the SLC 500 backplane. It consumes 50 mA at both 5V DC and 24V DC.
| Brand Name | |
| Model No. | 1746-NR4 |
| Product Type | Analog Input Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
