Overview
Manuals
Lifecycle & Migration Status
Important Notes
Features:
- 8 channels, fully isolated from channel-to-channel and channel-to-backplane
- 0 to 21 mA (optimized for standard 4–20 mA industrial current loops)
- Highly precise 16-bit unipolar resolution (330 nA/bit) providing 65,535 counts
The Allen-Bradley 1771-NIS is an I/O module belonging to the 1771-N high-resolution I/O module family. It features eight current input channels with a rated current range of 4-20mA. The 1771-NIS module provides loop power to the input circuitry. The 1771-NIS draws 2.4A from the I/O chassis backplane, with a total power consumption of 12W. The 1771-NIS can be connected to PLC-5/250, PLC-3, and PLC-5 controllers.
The 1771-NIS input channels support a current range of 0.1–21mA. The input channel resolution is 330nA/bit (16-bit unipolar), and the maximum input impedance is 300Ω. The module provides a 20–30V DC loop supply (current range 0 to 20mA). The 1771-NIS module can detect open circuits within 5 seconds and provides 24V DC overvoltage protection. Its common-mode rejection ratio (CMRR) is 150 dB, with a typical value of 50 dB. Offset drift is ±200 nA/°C, and gain drift is ±95 ppm/°C. The maximum update time per module is 25 seconds, and the input channel bandwidth is 9 Hz.
The 1771-NIS/C Allen Bradley N-Series Analog I/O Module may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen Bradley 1771-NIS/C N-Series Analog I/O Module Manuals(Datasheets), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Discontinuation: Rockwell Automation officially discontinued the entire 1771 I/O series in 2017. Modern Migration Path: If you are upgrading your system to ControlLogix, Rockwell offers dedicated conversion systems, such as the 1492-CONACAB migration cable, to seamlessly transition your 1771-N Series cabling infrastructure to 1756 I/O modules.
The 1771-NIS, 1771-NBSC and 1771-NB4S modules are sourcing/sinking input modules. These modules can supply the necessary loop power for 2-wire transmitters connected to the input. All loop power functionality is contained within the analog module. No external resistors are required.
