PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1746-NO4I is an SLC 500 analog current output module. It installs directly into any available slot within a standard 1746 chassis. The hardware provides four individually isolated analog output channels for process control. Signal conversion delivers 14-bit resolution across a 0 to 20 mA DC range. It communicates with the processor using 16-bit two's complement binary format.
Field wiring connects through a removable terminal block accommodating conductors up to 14 AWG. Recommended field cabling requires shielded Belden 8761 cable for signal integrity. The module draws 55 mA at 5V DC and 195 mA at 24V DC from the backplane. Full electrical isolation provides 500V DC protection between field wiring and backplane circuits. The operational temperature spans 0 to 60 degrees Celsius.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Product Line | SLC 500 |
|---|
| GTIN | 10662073735912 |
|---|
| Weight | 0.75 lbs (0.34 kg) |
|---|
| UPC | 662073735915 |
|---|
| Backplane Current Draw at 5V | 55 mA |
|---|
| Backplane Current Draw at 24V | 195 mA |
|---|
| External Power Switch | Supported |
|---|
| SLC Communication Format | 16-Bit 2's Complement Binary Format |
|---|
| Isolation for Field Wiring to the Backplane | 500V DC |
|---|
| Recommended Cable | Shielded Belden #8761 |
|---|
| Removable Terminal Block | Included |
|---|
| Max. Wire Size | #14 AWG |
|---|
| Location | 1746 Chassis |
|---|
| Operating Temperature | 0 to 60 degrees Celsius |
|---|
| Storage Temperature | -40 to 85 degrees Celsius |
|---|
| Output Channels | 4 (individually isolated) |
|---|
| Output Signal Range | 0 - 20 mA DC |
|---|
| Resolution | 14-bit |
|---|
| Backplane Current Draw | 0.055 A at 5 V DC |
|---|
| Module Type | Analog Current Output |
|---|
| Series Compatibility | SLC 500 Modular Hardware |
|---|
TECHNICAL INFORMATION
Features
- Four individually isolated current output channels operating across 0 to 20 mA DC.
- Hardware digital-to-analog converter resolution of 14 bits.
- Standard 16-bit two's complement binary communication format with SLC 500 processors.
- Backplane current consumption of 55 mA at 5V DC and 195 mA at 24V DC.
- Electrical isolation rated at 500V DC between field-side wiring and the backplane.
- Field connection via removable terminal block accepting wire sizes up to 14 AWG.
- Support for an external power switch configuration.
- Operating temperature envelope extending from 0 to 60 degrees Celsius.
TECHNICAL INFORMATION
Applications
- Driving 0 to 20 mA current loop actuators and positioners from an SLC 500 chassis.
- Sending current control setpoints to variable frequency drives and process controllers.
- Industrial automation loops requiring 500V DC channel-to-backplane isolation.
TECHNICAL INFORMATION
Connections / Interfaces
- Installs into any compatible single slot within a 1746 modular chassis.
- Equipped with a removable terminal block accepting wiring up to 14 AWG.
- Field wiring requires shielded Belden 8761 cable for signal circuits.
TECHNICAL INFORMATION
Installation Guidelines
- Seat the module firmly into the selected 1746 rack slot with power removed.
- Route shielded twisted-pair cables away from high-voltage AC conductors to prevent noise.
- Verify the external power switch setting matches the intended system power architecture.
- Confirm backplane power supply capacity covers the 55 mA and 195 mA loads.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure module addressing in the programming software using 16-bit two's complement binary format.
- Scale output data values in ladder logic to match the 14-bit digital-to-analog converter.
- Map each channel independently to handle 0 to 20 mA field device requirements.
TECHNICAL INFORMATION
Compatibility
- Allen-Bradley SLC 500 modular hardware chassis including 1746 racks.
- Field devices accepting 0 to 20 mA DC current loops.
- Shielded Belden 8761 instrumentation wiring.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSAllen-Bradley SLC 500 modular hardware chassis including 1746 racks. Field devices accepting 0 to 20 mA DC current loops. Shielded Belden 8761 instrumentation wiring.
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 is the primary function of the Allen-Bradley 1746-NO4I module?
The 1746-NO4I provides four isolated 0 to 20 mA analog current outputs for SLC 500 systems.
What cable type is recommended for connecting field devices to the 1746-NO4I?
Allen-Bradley specifies shielded Belden 8761 cable to connect field devices to this output module.
What are the backplane current requirements for the 1746-NO4I?
The module requires 55 mA at 5V DC and 195 mA at 24V DC from the backplane.
What is the reference market price for a surplus or refurbished 1746-NO4I?
Observed market reference pricing is approximately 389 USD. This is an indicative reference price only, not a final quotation.
