PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-NT1 is an eight-channel analog input module for the PLC-5 system architecture. It provides high-resolution measurement for thermocouple sensors and millivolt input signals. The module accepts thermocouple types B, E, J, K, T, R, and S. It also supports direct voltage signals across an input span of plus or minus 105 millivolts. A 16-bit analog-to-digital converter delivers fine conversion resolution across every active input channel. Internal logic communicates with the controller using Block Transfer Read and Block Transfer Write instructions.
Each channel features 1000V isolation to protect sensitive instrumentation from electrical ground loops. The unit draws operating current from the 1771 chassis backplane without requiring an external power supply. Onboard cold junction compensation operates across 0 to 70 degrees Celsius to maintain measurement accuracy. The module provides open-circuit detection, self-diagnostics, and selectable high and low process alarms. Engineers can format measurement data using binary-coded decimal or natural binary representations. Physical field connections terminate through a 1771-WH wiring arm mounted to the single-slot chassis assembly.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Backplane Current | 1.5 Amperes |
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| Category | PLCs |
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| Cold Junction Compensation | 0-70 Deg, Celsius +/- 25 Deg. Celsius |
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| Compatible Chassis | Any 1771 I/O chassis |
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| Compatible Proccesors | Any 1771 Processors supporting Block Transfer |
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| Data Format | BDC or Natural Binary |
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| Input Resolution | +/- 100 Milivolts (3.3 Microvolts/bit); B, R, S, Thermocouple (0.3 Celsius/bit, 0.6 Fahrenheit/bit); E, J, K, T, Thermocouple (0.1 Celsius/bit, 0.2 Fahrenheit/bit) |
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| Input Types | TC/Milivolt |
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| Module Type | N-Series Analog I/O Module |
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| Mounting | Rack Mountable |
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| Number of Inputs | 8 Inputs |
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| Number of Outputs | 0 Outputs |
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| Product Line | PLC 5 |
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| RTP Choice | 1771-RTP1 |
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| Temperature Scale | Celsius / Fahrenheit |
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| Thermocouple Linearization | IPTS-68 / NBS MN-125 |
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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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| UPC | 612598116829 |
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| Weight | 1.50 lbs (0.68 kg) |
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TECHNICAL INFORMATION
Features
- Eight isolated input channels accept thermocouple sensors and low-level millivolt voltage signals.
- High-resolution 16-bit analog conversion delivers accurate process measurement across every input channel.
- Cold junction compensation spans 0 to 70 degrees Celsius with automatic IPTS-68 sensor linearization.
- Provides 1000V channel-to-channel isolation to suppress ground loops and process interference.
- Communicates with PLC-5 processors using Block Transfer Read and Block Transfer Write commands.
- Features selectable high and low alarms along with open circuit and self-diagnostic detection.
TECHNICAL INFORMATION
Applications
- Temperature monitoring and process control using industrial thermocouple sensors.
- High-resolution analog acquisition for low-level millivolt instrumentation signals.
- Multi-channel isolated temperature data logging within 1771 universal I/O chassis.
TECHNICAL INFORMATION
Connections / Interfaces
- Field sensor conductors wire directly into the removable 1771-WH wiring arm.
- Backplane connectors interface with standard single slots inside 1771 I/O chassis.
- Optional remote field termination is supported through the 1771-RTP1 assembly.
TECHNICAL INFORMATION
Installation Guidelines
- Insert the module into any available single slot of a 1771 I/O chassis.
- Do not place this analog module adjacent to AC or high-voltage DC modules.
- Secure all thermocouple and millivolt leads to the designated 1771-WH terminals.
- Ground signal cable shields according to standard low-level analog wiring practices.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure channel parameters and alarms using Block Transfer Write (BTW) instructions.
- Transfer digitized engineering values to processor integer files using Block Transfer Read (BTR) instructions.
- Select either natural binary or BCD format to match the processor data structure.
- Define sensor types and temperature units in degrees Celsius or Fahrenheit per channel.
TECHNICAL INFORMATION
Compatibility
- Compatible with any 1771 I/O chassis.
- Compatible with 1771 processors supporting block transfer instructions.
- Not compatible for installation with PLC-2 controllers.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with any 1771 I/O chassis. Compatible with 1771 processors supporting block transfer instructions. Not compatible for installation with PLC-2 controllers.
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
Which sensors can be connected to the 1771-NT1 module?
The module accepts thermocouple types B, E, J, K, T, R, and S, plus +/-100 mV signals.
Does the 1771-NT1 analog module require external power?
No external power supply is needed. The unit draws operating power directly from the 1771 chassis backplane.
Can the 1771-NT1 module operate in a PLC-2 rack?
No. The 1771-NT1 module requires block transfer instructions and is not compatible with PLC-2 systems.
What is the reference price for the 1771-NT1 module?
Observed market reference pricing is approximately $429.00 USD for refurbished units. This is indicative market reference pricing only and is not a final quotation.
