Allen-Bradley 1746-NIO4I

SLC 4 Point Analog Current Combination Module

Read from the product label

Maker: Allen-Bradley
Part no.: 1746-NIO4I
Serial / rev.: as printed on your unit

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Allen-Bradley 1746-NIO4I SLC 500 analog combination module, discontinued: 2 current inputs and 0 to 20 mA outputs, 16 bit sigma-delta conversion.

Manufacturer: Allen-Bradley
Manufacturer part no.: 1746-NIO4I
Product family: SLC 500 I/O Modules (1746)
Type: Analog I/O module
Category: PLCs and I/O › Analogue I/O modules
Lifecycle: Discontinued
OEM successor: Not stated
Technical datasheet: Data sheet

Technical specifications

Manufacturer: Allen-Bradley
Manufacturer part no.: 1746-NIO4I
Type: Analog I/O module
Application: I/O module
Used with: SLC 500 1746 chassis
Backplane current: 55 mA
Number of inputs: 2
Backplane isolation: 500V AC and 710V DC withstand for 1 minute
Step response: 60 ms
Conversion method: sigma-delta modulation
Converter resolution: 16 bit
Full scale: 20 mA
Input range: ±20 mA (nominal) ±30 mA (maximum)
Current input coding: ±16,384 for ±20mA
Absolute maximum: ±7.5V DC or 7.5V AC RMS
Overall accuracy: ±0.642% of full scale (maximum)
Overall accuracy drift: +79 ppm/°C of full scale
Gain error @ 25 °C: +0.323% (maximum)
Gain error: +0.556% (maximum)
Gain error drift: ±67 ppm/°C
Overvoltage Protection (IN+ to -IN): 220V DC or AC RMS continuously
Voltage input coding: -32,768…+32,767 for +10V DC
Overall accuracy @ 25 °C (77 °F): ±0.284% of full scale
Overall Accuracy, 0…60 °C (32…140 °F): ±0.504% of full scale
Overall accuracy drift (maximum): +63 ppm/°C of full scale (maximum)
Gain error, 0…60 °C (32…140 °F): +0.461% (maximum)
Backplane current (mA) @ 24V: 145 mA
Isolation voltage: Tested @ 500V AC and 710V DC for 60 seconds
Output range (normal): 0…20 mA -1 LSB
Output coding: 0…32,764 for 0…21 mA

Show all 33 specifications

Overrange capability: 5% (0…21 mA -1 LSB)
Overall accuracy drift, max: ±70 ppm/°C of full scale
Gain error drift, max: ±62 ppm/°C of full scale

Technical documents (1)

Rockwell Automation SLC 500 systems selection guide 1747-SG001

Key features

Sigma-delta modulation conversion method
16 bit converter resolution
Input range ±20 mA nominal, ±30 mA maximum
Backplane isolation tested at 500V AC and 710V DC
Output range 0 to 20 mA -1 LSB

About the Allen-Bradley 1746-NIO4I

The 1746-NIO4I is an SLC 4 point analog current combination module, now discontinued. It has 2 inputs with a 16 bit sigma-delta converter and a step response of 60 ms; the input range is ±20 mA nominal, ±30 mA maximum. The normal output range is 0 to 20 mA -1 LSB, and backplane isolation withstands 500V AC and 710V DC for 1 minute.

What is the 1746-NIO4I used for?

It handles both current inputs and current outputs in a single SLC 500 slot. Input coding is ±16,384 for ±20 mA; output coding is 0 to 32,764 for 0 to 21 mA, with 5% overrange capability.

Lifecycle and successor

Discontinued (Rockwell Automation lifecycle status, checked 24 October 2026).

Before you order

What to photograph or confirm so the right unit is quoted.

Read the catalog number 1746-NIO4I, the series letter and the firmware revision from the label. Send us a photo of the label and we confirm the match before we quote.

Other parts in the Allen-Bradley SLC 500 I/O Modules family

Listed for reference. They differ from the 1746-NIO4I in rating, supply, interface or function and are not interchangeable with it unless Allen-Bradley says so. Match the part number on your unit.

Product	Type	Lifecycle	Qty Available	Price	Action
Allen-Bradley 1746-NO4VSLC 4 Point Analog Output Module	Analog output module	Discontinued	On request	On request	View
Allen-Bradley 1746-NR4SLC 4 Point Resistance Input Module	Analog input module	Discontinued	On request	On request	View
Allen-Bradley 1746-ITB16SLC 16 Point 24V DC Digital Input Module	Analog input module	Discontinued	On request	On request	View
Allen-Bradley 1746-IV16SLC 16 Point Digital Input Module	Digital input module	Discontinued	On request	On request	View
Allen-Bradley 1746-IV32SLC 32 Point 24V DC Digital Input Module	Digital input module	Discontinued	On request	On request	View
Allen-Bradley 1746-NI16ISLC 16 Point Analog Input Module	Analog input module	Discontinued	On request	On request	View
Allen-Bradley 1746-NI4SLC 4 Point Analog Input Module	Analog input module	Discontinued	On request	On request	View
Allen-Bradley 1746-NIO4VSLC 4 Point Analog Voltage Comb Module	Analog I/O module	Discontinued	On request	On request	View
Allen-Bradley 1746-NO4ISLC 4 Point Analog Output Module	Analog output module	Discontinued	On request	On request	View
Allen-Bradley 1746-NO8ISLC 8 Point 20 mA Output Module	Analog output module	Discontinued	On request	On request	View
Allen-Bradley 1746-NO8VSLC 8 Point Analog Output Module	Analog output module	Discontinued	On request	On request	View
Allen-Bradley 1746-OA16SLC 16 Point Output Module, 120/240V AC	Digital output module	Discontinued	On request	On request	View

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