PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1746-NR4 is an SLC 500 Analog Input Module. It provides four backplane-isolated input channels for resistance temperature detectors and direct resistance devices. The unit uses sigma-delta modulation for analog-to-digital conversion. It operates without an external power supply. The module performs self-calibration when a channel is enabled or when operating parameters change.
This module features five diagnostic LED indicators on the front panel. One LED displays overall module status. Four individual LEDs show channel conditions. It includes programmable low-pass digital filtering. Each channel includes broken sensor detection to signal open or shorted circuits. Detected sensor faults generate an out-of-range status indication.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| A/D Conversion method | Sigma-delta modulation |
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| Backplane Current | 50 mA |
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| Backplane Power Consumption | 1.5 W max (0.3 W at 5V dc, 1.2 W at 24V dc) |
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| Bandwidth | 2.62-65.5 Hertz |
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| Category | PLCs |
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| Compatible RTD Sensors | Platinum (385) 100, 200, 500 and 1000; Platinum (3816) 100, 200, 500 and 1000; Copper (426) 10, Nickel (618) 120, Nickel (672) 120, and Nickel Iron (518) 604. |
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| Compatible Resistance input range | 0 - 150 Ohms, 0 to 500 Ohms, 0 to 1000 Ohms and 0 to 300 Ohms |
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| GTIN | 10662468165911 |
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| I/O Chassis location | Any slot except Slot 0 |
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| Inputs | 4 |
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| Module Type | RTD/Resistance Analog Input Module |
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| No. if Inputs | Four (4) |
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| Operating Isolation | 500 Volts/1 minute |
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| Operating Temperature | 0 to 60 degrees Celsius |
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| Resolution | .01 Deg. Celcius |
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| Step Response | 60 milliseconds in, 2.5 milliseconds out |
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| Storage Temperature | -40 to 85 degrees Celsius |
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| UPC | 10662468440742 |
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| Update Time | 17 milliseconds-1.2 seconds |
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| Weight | 1.00 lbs (0.45 kg) |
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TECHNICAL INFORMATION
Features
- Four backplane-isolated RTD and resistance input channels
- Sigma-delta analog-to-digital conversion with programmable digital filtering
- Automatic self-calibration upon channel enablement or parameter reconfiguration
- Front-panel LED indicators for module status and four channel states
- Integrated broken sensor detection signaling open or short circuits
- Direct resistance measurement across ranges up to 1000 Ohms
TECHNICAL INFORMATION
Applications
- Temperature monitoring in industrial automation processes
- Direct resistance measurement for mechanical displacement mechanisms
- Position feedback monitoring on pick and place equipment
- Clamping equipment status sensing in manufacturing systems
TECHNICAL INFORMATION
Connections / Interfaces
- Direct input connections for compatible RTD sensors
- Direct wiring for resistance signals up to 1000 Ohms
- Optical isolation rated at 500 Volts DC for one minute between inputs and backplane
- Optical isolation rated at 500 Volts DC for one minute between inputs and chassis ground
TECHNICAL INFORMATION
Installation Guidelines
- Install the module in any chassis slot except Slot 0.
- Slot 0 is reserved exclusively for the SLC 500 processor or adapter.
- The unit fits into modular SLC 500 chassis or 1746-A2 fixed expansion chassis.
- Maintain ambient operating temperatures between 0 and 60 degrees Celsius.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure digital low-pass filter frequencies based on required process bandwidth.
- Select compatible sensor types including Platinum, Copper, Nickel, or Nickel-Iron curves.
- Set resistance measurement ranges according to specific process input requirements.
TECHNICAL INFORMATION
Compatibility
- Compatible with SLC 500 modular hardware chassis
- Compatible with SLC 500 fixed style systems using 1746-A2 expansion chassis
- Supports Platinum (385 and 3816), Copper (426), Nickel (618 and 672), and Nickel-Iron (518) sensors
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with SLC 500 modular hardware chassis Compatible with SLC 500 fixed style systems using 1746-A2 expansion chassis Supports Platinum (385 and 3816), Copper (426), Nickel (618 and 672), and Nickel-Iron (518) sensors
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
Can the 1746-NR4 module be installed in Slot 0 of an SLC 500 chassis?
No. Slot 0 is dedicated to the SLC 500 controller or adapter module.
Does the 1746-NR4 require an external power supply to operate?
No. The module draws its operating power directly from the SLC 500 backplane.
What happens when a sensor wiring break occurs on a channel?
The module detects open or short circuits and reports an out-of-range status error.
