Allen-Bradley 1746-NO4I Analog Output Module

The Allen-Bradley 1746-NO4I is a SLC 500 four-channel analog output module that provides four current-output channels delivering 0 to 20 mA signals to field devices from a PLC backplane, enabling direct analog control of actuators and process equipment in a wide range of automation tasks. Designed for the SLC 500 family, it supports installation in a standard 1746 I/O rack and is commonly used to drive valves, dampers, and other devices that respond to current-output control signals in batch, manufacturing, or safety-critical processes. Power for the module can be supplied from the SLC backplane or via an external 24 V DC supply, offering installation flexibility where backplane current limits would otherwise constrain output drive. Rockwell Automation lists the 1746-NO4I as a SLC 4 Point Analog Output Module and notes its lifecycle status as discontinued as of April 29, 2021, making it relevant primarily for legacy-system maintenance or projects that can accommodate migration to newer 1746 or modern I/O families.