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N-Series High Resolution Analog Input Module
A 16-bit isolated analog input module
for Allen-Bradley PLC-5 systems
capturing 0.1–21 mA current signals
from field instrumentation
The 1771-NIS/C is a high-resolution, current-loop analog input module belonging to the PLC-5 infrastructure. Designed with onboard loop power functionality, the component directly energizes connected 2-wire field transmitters without requiring auxiliary power distribution hardware. It houses 8 dedicated 4–20 mA current input channels and draws a continuous current load of 2.9 A from the chassis backplane. Thermally ruggedized for industrial deployments, the module operates reliably across a temperature envelope of 0 to 60 °C and maintains mechanical integrity under non-condensing relative humidity conditions up to 95%.
16-Bit Ultra-High Resolution
Channel-to-Channel Isolation
Integrated Onboard Loop Power
The Allen Bradley 1771-NIS/C provides high-precision signal processing, featuring a 0.1–21mA input range, 16-bit unipolar resolution, and a 9Hz bandwidth, along with built-in 24V DC overvoltage protection and a 5-second open-circuit detection capability. The module exhibits an exceptionally high common-mode rejection ratio of 150 dB and strong resistance to thermal drift, with an offset drift of ±200nA/°C and a gain drift of ±95 ppm/°C, making it suitable for precise current-loop signal acquisition in industrial environments.
For installation and maintenance, this card operates in conjunction with the 1771-RTP4 termination panel, and mandates that the main power must be disconnected before performing any chassis insertion or removal operations for applications other than thermocouples. At the underlying register level, this hardware establishes strict boundary limits, setting 3.2mA as the under-range threshold and 21mA as the over-range limit. Each input channel features a maximum input impedance of 300 ohms and utilizes a normal-mode rejection of 50 dB to 60 dB to suppress measurement distortions induced by differential-mode noise.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Allen Bradley 1771-NIS/C High-Res Analog Input Module Manuals, Datasheets, Drivers, 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.
Petrochemical Processing
High-precision acquisition of temperature transmitter signals in refining reactors to prevent overheating accidents.
Thermal & Hydroelectric Power Generation
Monitoring boiler steam pressure or hydro-turbine inlet flow to ensure power generator stability.
Metallurgy & Steel Smelting
Collecting oxygen flow and molten metal pool radiation temperature data from blast furnaces and converters.
Pharmaceutical Manufacturing
Accurately monitoring pH sensors and dissolved oxygen analyzers in bio-fermentation tanks.
Pulp & Paper Industry
Monitoring pulp flow rate, consistency transmitters, and dryer roll steam pressure to maintain uniform paper thickness.
Rubber & Plastics Processing
High-resolution reading of mold temperatures and melt injection pressures in injection molding or vulcanizing machines.
Live hot-swapping is strictly prohibited. Before inserting or removing the 1771-NIS/C module from the chassis slot, the main power to the 1771 I/O chassis must be completely isolated to prevent high backplane current (2.9A) from generating arc damage on the gold-finger contacts during unseating. Routine calibration should be executed across the entire card using two standardized characteristic nodes at 1 mA and 21 mA to calibrate conversion linearity.
The 1771-NIS/C is a high-precision, channel-to-channel isolated current-loop analog acquisition hardware unit utilized within the Allen-Bradley PLC-5 infrastructure. As a high-resolution branching component within the legacy 1771 I/O family, this module is purpose-built to capture subtle field current fluctuations ranging from 0.1 to 21 mA, rather than general voltage or thermocouple signals. It establishes a high-integrity, low-noise data conversion physical pathway between field instrumentation and the central processor, operating as a core legacy control component in process industries such as metallurgy, power, and petrochemicals.
The Allen Bradley 1771-NIS/C is a legacy N-Series High-Resolution Isolated Analog Input Module belonging to the classic PLC-5 controller infrastructure by Rockwell Automation.
What is the core function of the 1771-NIS/C within a PLC system?
Its core function is to receive 4-20mA discrete current signals transmitted from field industrial instrumentation and convert them with high precision into 16-bit digital binary codes recognized by the PLC processor.
How to install and commission the 1771-NIS/C in an industrial field?
With the chassis power completely isolated, slide the module into a 1771 I/O slot, connect it to a 1771-RTP4 Remote Termination Panel via a 1771-WH wiring arm or 1771-NC6 cable, and then program Block Transfer instructions in the PLC ladder logic.
How many input channels can the 1771-NIS/C support?
The module is permanently equipped with 8 independent analog input channels, all of which are specifically configured for current signal inputs.
Can the 1771-NIS/C module directly power field transmitters?
Yes, the hardware incorporates onboard loop power functionality, allowing it to directly energize 2-wire field transmitters connected to its channels.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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