Allen-Bradley 855E-24DN3 Digital Input Output Module

Allen-Bradley 855E-24DN3 is a 50 mm green signal-light module from the 855E stack-light family, designed to plug into Allen-Bradley 855E signal towers and provide a visible status indication on control panels. The DN3 variant uses a green incandescent lamp and operates on 24 V AC or DC, making it compatible with common industrial signaling circuits. As part of a modular signaling tower, it can be combined with other color modules to build a multi-color indicator stack that communicates machine state, faults, or process conditions at a glance. Typical applications include manufacturing cells, packaging lines, and automated production areas where quick visual feedback is essential for operators and maintenance staff. The 855E-24DN3 preserves the familiar 50 mm form factor that aligns with standard 855E enclosures, enabling straightforward replacement or expansion without rewiring. In service, it is used as a standalone color signal or as one segment of a layered tower, delivering illumination within the 855E signaling family. This variant is commonly specified for use in retrofit projects or new installations where a green run/ready indication is required within the 855E signaling family.