PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-NT2 is a PLC-5 high-resolution isolated analog input module. This unit provides 16-bit resolution with 0.01% typical accuracy over Full Scale Range. The hardware accommodates eight isolated input channels for thermocouple and millivolt signals. It features an input bandwidth of 9 Hz and an update time of 25 milliseconds. The underrange threshold is -5.5 mV and the overrange threshold is +56.0 mV.
The 1771-NT2 module mounts into standard 1771 series I/O chassis assemblies. Normal mode noise rejection is 50 dB at 50 Hz and 60 dB at 60 Hz. Common mode noise rejection is 150 dB at 60 Hz. Operating temperatures range from 0 to 60 degrees Celsius in Pollution Degree 2 environments. Field connections interface with the module through the 1771-WH arm or 1771-RTP1 interface.
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 | 612598123339 |
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| Weight | 1.75 lbs (0.79 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 | TC/Milivolt |
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| Input Resolution | -5/+55 Milivolts (0.95 Microvolt/bit); B, R, S, Thermocouple (0.03 Celsius/bit, 0.06 Milivolt/bit); E, J, K, T, Thermocouple (0.1 Celsius/bit, 0.2 Fahrenheit/bit); C Thermocouple (0.07 Celsius/bit, 0.1 Fahrenheit/bit); N Thermocouple (0.03 Celsius/bit, 0. |
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| Number of Outputs | 0 Outputs |
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| RTP Choice | 1771-RTP1 |
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| Backplane Current | 1.5 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
- Eight isolated input channels accept millivolt signals and thermocouples.
- Conversion resolution reaches 16 bits with 0.01% typical accuracy over full scale.
- Operating bandwidth reaches 9 Hz with a maximum 25-millisecond update time.
- Normal mode rejection provides 50 dB at 50 Hz and 60 dB at 60 Hz.
- Common mode noise rejection provides 150 dB at 60 Hz.
- Selectable data representation supports BCD or Natural Binary formatting.
- Open-type construction meets Pollution Degree 2 industrial environment standards.
TECHNICAL INFORMATION
Applications
- Demanding process control monitoring applications requiring isolated analog inputs.
- Low-voltage millivolt instrumentation data acquisition across PLC-5 rack systems.
- Process temperature measurement using isolated thermocouple field sensors.
TECHNICAL INFORMATION
Connections / Interfaces
- Field signals terminate directly through the 1771-WH wiring arm.
- Remote field connections connect through the 1771-RTP1 remote termination panel.
- Backplane connectors plug directly into standard 1771 I/O chassis slots.
TECHNICAL INFORMATION
Installation Guidelines
- Seat the module into any compatible slot of a de-energized 1771 rack.
- Maintain an operating industrial atmosphere conforming to Pollution Degree 2 requirements.
- Ensure the enclosure is accessible only by means of a tool or appliance.
- Fasten the 1771-WH wiring arm securely before applying electrical power.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure channel ranges and operating parameters using IOCONFIG software.
- Select Natural Binary or BCD data format for PLC-5 processor communications.
- Configure each channel independently according to application requirements.
- Define programmable reset values for outputs based on system requirements.
TECHNICAL INFORMATION
Compatibility
- Allen-Bradley PLC-5 1771 I/O chassis racks.
- Allen-Bradley 1771-WH field wiring arm assemblies.
- Allen-Bradley 1771-RTP1 remote termination panel hardware.
TECHNICAL INFORMATION
Compliance and Certifications
- EN/IEC 60664-1 Pollution Degree 2 industrial environment standard
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSAllen-Bradley PLC-5 1771 I/O chassis racks. Allen-Bradley 1771-WH field wiring arm assemblies. Allen-Bradley 1771-RTP1 remote termination panel hardware.
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 sensor inputs does the 1771-NT2 module support?
The module supports -5 to +55 mV inputs and B, C, E, J, K, N, R, and S thermocouples.
Which wiring arm is compatible with the 1771-NT2?
The module connects using the 1771-WH wiring arm or the 1771-RTP1 remote termination panel.
How many input channels does the 1771-NT2 provide?
The 1771-NT2 provides eight isolated, independently configurable input channels.
What software utility is used to configure the 1771-NT2?
The IOCONFIG software utility is recommended to configure channel parameters on this module.
