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A-B 1746-NIO4I SLC 500 Analog I/O Module

The Allen-Bradley 1746-NIO4I is a combination analog input/output module for the SLC 500 PLC platform. It provides two analog input channels and two analog current output channels for monitoring process signals and controlling industrial equipment.

Key Technical Specifications

Parameter	Specification
Brand	Allen-Bradley (A-B)
Model	1746-NIO4I
Product Type	Analog Combination I/O Module
Product Family	SLC 500
Analog Inputs	2 differential channels
Input Signal	±10 V DC or ±20 mA
Analog Outputs	2 current output channels
Output Signal	0–20 mA
Output Resolution	14 bit
Maximum Output Load	0–500 Ω
Backplane Current at 5 V DC	55 mA
Backplane Current at 24 V DC	145 mA
Field Wiring Isolation	500 V DC
Update Time	512 μs for all channels in parallel
Operating Temperature	0°C to +60°C
Mounting	Allen-Bradley 1746 chassis
Terminal Block	Removable
Lifecycle Status	Discontinued

Rockwell Automation

Features and Advantages

Combines analog input and output functions in one compact module.
Accepts voltage or current input signals for process monitoring.
Provides two 0–20 mA outputs for proportional control applications.
Supports differential inputs to help reduce common-mode noise.
Integrates with compatible SLC 500 PLC chassis and controllers.

Typical Applications

Industrial process monitoring and control
Flow, pressure, and temperature signal processing
Valve and actuator control
Pump and motor control systems
Manufacturing and process automation

Important Notes

Discontinued: Rockwell Automation lists the 1746-NIO4I as discontinued effective April 29, 2021.

US
Requires a compatible SLC 500 chassis and correct module configuration.
Confirm input signal ranges and output load requirements before installation.
The module’s analog channels are not individually isolated.