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PRODUCT DESCRIPTION
Eight current-input channels for legacy PLC measurement loops
Allen-Bradley 1771-NIS/B is listed as a Series B 1771-NIS high-resolution isolated analog input module. The official base-catalog documentation describes eight current-input channels, including sourcing and sinking connections for compatible transmitters, within a 1771 PLC system.
For an installed replacement, confirm the actual hardware series and match the remote termination panel, cable and loop-power arrangement. Apply the documented base-module specifications while checking any series-specific instructions, and preserve channel scaling, block-transfer data and diagnostic handling in the controller program.
For an installed replacement, confirm the actual hardware series and match the remote termination panel, cable and loop-power arrangement. Apply the documented base-module specifications while checking any series-specific instructions, and preserve channel scaling, block-transfer data and diagnostic handling in the controller program.
BEFORE YOU BUY
Confirm the complete installed configuration
ACTUAL APPLICATIONS
Current-loop acquisition in compatible PLC systems
Official N-series documentation supports current-loop acquisition, engineering-unit conversion and input diagnostics. These are application roles for an engineered system rather than claims of a particular plant installation.
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01 · Transmitter acquisition
Read compatible two-wire measurement loops
The NIS input can provide loop power for a correctly connected two-wire transmitter. Confirm the transmitter supply requirement and current range, then configure the PLC scaling to represent its measured process variable. -
02 · Externally powered instrumentation
Receive signals from powered field circuits
Where the documented sinking connection is used, the input receives the signal from the external loop arrangement. Verify polarity and the selected RTP wiring so an externally powered loop is not connected as an incompatible source circuit. -
03 · Process input supervision
Detect invalid measurement conditions
The documented input status information identifies overrange, underrange and configured alarm conditions. The controller program must interpret those flags together with the measurement value before taking a process-control action.
Technical specifications for 1771-NIS/B
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Product Model1771-NIS/B
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Product ParametersIsolated analog current input module
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In stock1 unit
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ManufacturerAllen-Bradley
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Input channelsEight isolated current inputs
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Nominal input signal4 to 20 mA; documented measurement range 0.1 to 21.0 mA
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Input resolution330 nA per bit; 16-bit unipolar
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Input impedance300 ohms maximum
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Transmitter loop supply20 to 30 V DC over 0 to 20 mA; current limited below 29 mA
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Backplane requirement2.9 A at 5 V; 12 W maximum in base-module specification
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Module update interval25 ms maximum
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Input bandwidth9 Hz
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Input settling time125 ms maximum to within 0.1 percent of full scale
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Open-input responseDownscale; detection within 5 seconds maximum
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Chassis occupancyOne compatible 1771 I/O slot
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Field cable options1771-NC6, six feet; or 1771-NC15, fifteen feet; suitable RTP required
View all additional
Alternative Names
Allen-Bradley 1771-NIS Series B
1771-NIS/B analog input
1771 NIS B current input module
SYSTEM & REPLACEMENT CHECK
Information needed before ordering
Three direct checks to secure your system integration and minimize ordering risks.
Information
System integration
Replacement check
Manuals & support
1771-N CURRENT INPUT
Check loop power, termination and input scaling
Confirm that the installed module is the listed NIS/B variant. The documented NIS function is isolated current input, not digital switching, voltage output or direct thermocouple measurement.
Identify the remote termination panel and cable, then verify whether each transmitter uses the sourcing or sinking arrangement. Check loop supply, polarity and the current signal range before wiring.
Preserve the PLC block-transfer configuration and scaling. Validate measured values, open-loop behavior and diagnostic flags before returning the measurement channels to the control application.
Features:
- Current-input identity
- Verified transmitter connection
- Input data and diagnostics
The Allen-Bradley 1771-NIS/B requires loop-specific checks before system integration and commissioning.
INTERCHANGEABILITY
Verify the complete replacement identity before commissioning
The official 1771-NIS base catalog is discontinued from May 31, 2017. Replacement is classified as Engineering Replacement, not proven drop-in hardware interchangeability.
A ControlLogix migration requires a selected analog input module and the correct 1492 conversion arrangement for the retained 1771 termination panel. Confirm signal characteristics, wiring, power and controller configuration.
Series-specific differences between B and other hardware revisions remain unconfirmed. Compare the actual equipment identification and applicable instructions before accepting a spare or implementing a platform migration.
Features:
- Base catalog discontinued
- Engineered I/O migration
- No assumed series equivalence
The Allen-Bradley 1771-NIS/B requires replacement verification against the complete installed configuration and current manufacturer documentation.
DOCUMENTATION STATUS
Browse the Manuals, Datasheets, Official Documents, Links
Important Notice: Amikon is an independent supplier. Consult the applicable Rockwell Automation documentation and installed configuration before selection, installation or replacement.Features:
- Exact-model reference documents
- Hardware and system compatibility checks
- Accessories are supplied only when listed in the quotation
Documentation for the Allen-Bradley 1771-NIS/B supports document applicability checks before installation or replacement.
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Important notice
Manuals, software, firmware, cables, calibration data and accessories are included only when listed in the quotation. AMIKON is an independent supplier and is not affiliated with or authorised by the manufacturer.
This content has been produced using multiple sources. Takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
BUYER INFORMATION
Commercial terms without hidden steps
Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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Shipping & delivery
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DispatchEligible stock: same / next day
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CarriersDHL, FedEx or UPS
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Ship fromXiamen, China
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Packed sizePacked dimensions unconfirmed
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Shipping weightGross weight unconfirmed
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Payment & customs
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PaymentBank transfer (T/T)
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CurrenciesUSD · EUR · GBP · RMB
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Credit cardsNot accepted
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HS referenceClassification unconfirmed
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OriginOrigin unconfirmed
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Warranty & returns
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Warranty12 months from AMIKON
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InspectionLabel, condition and packing checks
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ReturnsPrior RMA authorisation required
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CompatibilityConfirm before order
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OEM warrantyDoes not apply
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Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
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Part checked
Full suffix recorded -
Condition checked
Label and appearance -
Packing checked
Antistatic protection -
Tracking supplied
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Sandy Lin
Dedicated account manager · 15+ years
FREQUENTLY ASKED QUESTIONS
Questions buyers ask about 1771-NIS/B
Direct answers about identity, compatibility, stock, warranty, payment and shipping.
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Does 1771-NIS/B supply power to a two-wire transmitter?
The official NIS documentation permits sourcing and sinking input arrangements and can supply loop power for a correctly wired two-wire transmitter. Confirm its power requirements and follow the applicable RTP diagram. -
Can a thermocouple be connected directly to this input?
No such compatibility is established for NIS. It is a current-input catalog; the N-series manual lists separate thermocouple and RTD module types. Use the correct input hardware for the sensor signal. -
Is the input update interval 25 seconds?
No. The official specification states a maximum module update time of 25 milliseconds. This is distinct from input settling time and open-input fault detection. -
What happens when the measurement loop opens?
The documented current-input response is downscale, with open-input detection within five seconds maximum. Configure the controller to evaluate input status rather than treating every low value as a valid measurement. -
Can the old termination panel remain during a ControlLogix conversion?
The 1492 conversion guide describes retaining suitable 1771 RTPs using selected conversion cables and compatible 1756 I/O. The exact panel, signal and wiring conversion must be checked; this is not a direct module swap. -
What is the published lifecycle status of the base NIS catalog?
Rockwell Automation lists 1771-NIS as discontinued from May 31, 2017 and categorizes replacement as engineering work. No separate B-series discontinuation date is asserted. -
Are Series B and Series C automatically interchangeable?
The reviewed material does not prove that. Preserve the complete listed suffix and check the actual unit label, configuration and applicable manufacturer guidance before substituting another hardware series.
READY TO VERIFY YOUR PART?
Get a 1771-NIS/B quote with price, lead time and revision check.
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