1746-N1161 Allen-Bradley

1746-N1161 Allen-Bradley I / O module

Product  Description：

The 1746-NI16I is a specialized module for the SLC 500 platform that focuses on current inputs. Unlike standard modules that might only offer 4 or 8 channels, this "high-density" module provides 16 channels in a single slot, making it highly efficient for large-scale deployments. It is an isolated module, which means it provides electrical separation between the input channels and the backplane, protecting the controller from surges and reducing ground loop interference.

Product Parameters

The module operates within the following technical specifications:

• Number of Inputs: 16 isolated current input channels

• Input Range: 0 to 20 mA or 4 to 20 mA (user-selectable)

• Resolution: 16-bit binary, providing high precision for sensitive measurements

• Backplane Current Draw: 125 mA at 5V DC and 150 mA at 24V DC

• Isolation Voltage: 500V DC continuous between inputs and the backplane

• Update Time: Varies based on the number of active channels and filter frequency settings

• Accuracy: Better than 0.1% of full scale at room temperature

• Terminal Block: Removable terminal block (1746-RT25C) for easier wiring and maintenance

Product Advantages

One of the primary advantages of the 1746-NI16I is Space Efficiency. By packing 16 channels into a single SLC slot, users can significantly reduce the size of their control chassis or increase the capacity of existing systems without adding more hardware racks.

Another key advantage is Channel Isolation. Because each channel is isolated, a fault or short circuit on one sensor will not affect the operation of other sensors connected to the same module. This feature is critical for high-availability systems where uptime is prioritized.

The High Resolution (16-bit) ensures that very small changes in current can be detected, making it suitable for scientific or precision manufacturing processes where 12-bit modules are insufficient.

Important Considerations and Precautions

When installing or maintaining the 1746-NI16I, several precautions must be observed:

• Current Input Only: Note that this specific model (NI16I) is designed for current signals. It does not natively support voltage inputs (like 0-10V). Attempting to wire voltage sources directly without conversion could damage the module.

• Shielding: To maintain the high accuracy and resolution of the 16-bit converter, always use twisted-pair shielded cable for input signals and ground the shield at only one end (usually the controller end).

• Power Requirements: Ensure the SLC power supply can handle the 24V DC current draw required by this module, especially if multiple high-density modules are used in the same rack.

• Configuration: The module must be correctly configured in the RSLogix 500 software. Incorrect bit-setting for the input range (0-20mA vs 4-20mA) will result in inaccurate data readings.

• Discontinuation Status: The SLC 500 line is considered a "Legacy" or "End of Life" product range by Rockwell Automation. Users should consider keeping spare modules in stock or planning a migration to the ControlLogix or CompactLogix platforms.

Product Applications

The 1746-NI16I is widely used in industries requiring dense monitoring of environmental or process variables.

• Water and Wastewater Treatment: Monitoring flow rates, chemical levels, and pressure across multiple tanks and pumps.

• Oil and Gas: Collecting data from numerous pressure transmitters and temperature transducers along pipelines.

• HVAC Systems: Controlling large-scale building automation where dozens of air quality and temperature sensors need to be integrated into a central PLC.

• Manufacturing: Monitoring current loops from various motor drives or load cells to ensure consistency in production quality.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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