Allen-Bradley 855T-B24FN3 Analog Input Module

Allen-Bradley 855T-B24FN3 is a 70 mm control-tower stack light module from the Bulletin 855T signaling family. The 24 V AC/DC-powered unit uses a flashing incandescent lamp to provide a high-visibility status indicator on control panels and machine enclosures. This FN3 variant is intended for signaling applications and is designed to be used with other 855T modules to form a multi-position tower, allowing quick at-a-glance cues across an automation line. The 24V designation confirms its supply voltage range, while the flashing incandescent illumination ensures attention-grabbing operation in environments where rapid status updates are needed. Typical applications include conveying machine states such as running, fault, and standby on conveyors, packaging lines, and automated processes. As part of Allen-Bradley’s 855T Stack Light line, it supports straightforward integration in 24V signaling systems and serves as a dedicated visual alert that complements other control or alarm indicators in industrial installations.