Allen-Bradley 1746-OB32 SLC 500 32-Point DC Output Module By wayne No Comments on Allen-Bradley 1746-OB32 SLC 500 32-Point DC Output Module 2 Min Read Buy the Allen-Bradley 1746-OB32 SLC 500 digital output module. It offers 32 channels at 24VDC with sourcing outputs for high-current discrete control.