Allen-Bradley 1746-OB16 SLC 500 16-Point DC Output Module

Allen-Bradley 1746-OB16 is a 16-channel DC output module for the SLC 500 family that provides sourcing 10–50 V DC outputs to drive DC loads directly from a Rockwell Automation PLC. It is designed to switch loads such as relay coils, solenoids, and indicator devices in automation panels, and it plugs into a 1746 I/O rack where each of its 16 points is a separate transistor-style output fed from a common DC supply. The module operates over a 10–50 V DC input range, enabling typical 24 V loads used in industrial control. Each output point is rated for approximately 0.5 A under nominal conditions (30°C), with a total module current ceiling around 8 A at 30°C, which informs how many loads you can drive concurrently without exceeding the backplane’s power budget. As a sourcing output card, the device delivers current to the load when the corresponding output is activated, with the other end of the load returning to the DC common. This SLC 500 module is documented as 16-point DC output, offering straightforward integration with Rockwell’s ladder logic programming and RS-Logix/RSLogix environments. Rockwell Automation also notes that the 1746-OB16 was discontinued as of September 30, 2024, so organizations planning new designs should evaluate legacy availability or migration options within the SLC 500 family or toward modern platforms.