PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-NIS is an analog input module for PLC-5 systems. It features eight current input channels rated for 4 to 20 mA signals. The module provides loop power from 20V DC to 30V DC for field circuits. It interfaces directly with PLC-5, PLC-3, and PLC-5/250 controllers. The unit dissipates up to 12 W of power during operation.
Each input channel supports an operating range from 0.1 mA to 21 mA. Resolution across the inputs is 330 nA per bit at 16 bits unipolar. The module detects open input circuits within a maximum of 5 seconds. Built-in circuitry provides 24V DC overvoltage protection across the current inputs. Input channel calibration values are rated at 1 mA and 21 mA. Operating ambient temperatures range from 0 to 60 degrees Celsius.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Category | PLCs |
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| Product Line | PLC 5 |
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| UPC | 612598122158 |
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| Weight | 17.06 lbs (7.74 kg) |
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| Module Type | N-Series Analog I/O Module |
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| Number of Inputs | 8 Inputs |
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| Input Types | Current |
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| Input Resolution | 4-20 Miliamperes (0.34 Microamperes/bit) (Module Suppllies Loop Power) |
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| Number of Outputs | 0 Outputs |
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| RTP Choice | 1771-RTP4 |
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| Backplane Current | 2.9 Amperes |
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| Data Format | BDC or Natural Binary |
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| Typical AC Signal Delay (Off) | 45 (+/- 15) ms |
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| Typical DC Signal Delay (Off) | 50 ms |
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| Wiring Arm | 1771-WH |
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| Mounting | Rack Mountable |
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TECHNICAL INFORMATION
Features
- Provides eight current input channels for 4 to 20 mA field signals.
- Supplies 20V DC to 30V DC loop power for transmitter circuits.
- Delivers 16-bit unipolar resolution rated at 330 nA per bit.
- Features selectable data formats including natural binary and BCD.
- Includes 24V DC overvoltage protection for input circuits.
- Detects open input circuits in 5 seconds maximum.
TECHNICAL INFORMATION
Applications
- Current loop transmitter monitoring in industrial process control systems.
- Analog signal acquisition in Allen-Bradley PLC-5 architectures.
TECHNICAL INFORMATION
Connections / Interfaces
- Installs directly into standard 1771 I/O chassis slots.
- Field connections terminate at the 1771-WH wiring arm.
- Supports connection using the 1771-RTP4 remote termination panel.
TECHNICAL INFORMATION
Installation Guidelines
- Disconnect chassis power before inserting or removing the module.
- Seat the module firmly into the card guides of the chassis.
- Maintain ambient operating temperatures between 0 and 60 degrees Celsius.
- Ensure operating humidity stays between 5% and 95% non-condensing.
TECHNICAL INFORMATION
Configuration Guidelines
- Select either natural binary or BCD data formats for processing.
- Configure input limits at 3.2 mA under-range and 21 mA over-range.
- Calibrate channel reference endpoints at 1 mA and 21 mA.
TECHNICAL INFORMATION
Compatibility
- Interfaces with Allen-Bradley PLC-5, PLC-3, and PLC-5/250 controllers.
- Compatible with standard Allen-Bradley 1771 I/O chassis.
- Operates with the 1771-WH wiring arm and 1771-RTP4 panel.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSInterfaces with Allen-Bradley PLC-5, PLC-3, and PLC-5/250 controllers. Compatible with standard Allen-Bradley 1771 I/O chassis. Operates with the 1771-WH wiring arm and 1771-RTP4 panel.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What input signals does the 1771-NIS module support?
The module supports eight current inputs rated from 0.1 to 21 mA, nominally 4 to 20 mA.
Does the 1771-NIS provide loop power to field transmitters?
Yes, the module supplies 20V DC to 30V DC loop power directly to input circuits.
Which controllers support the 1771-NIS analog input module?
The module interfaces with Allen-Bradley PLC-5, PLC-3, and PLC-5/250 controller platforms.
What is the market reference price for the 1771-NIS?
Observed reference prices range from $949 to $1,890. These figures are indicative market reference pricing only and are not a final quotation.
