855T-B24SA1 | Allen-Bradley Control Tower Stack Light, Black Housing, 24V AC/DC

The Allen-Bradley 855T-B24SA1 is used for visual and audible signaling in industrial environments. It helps indicate machine status, faults, or process conditions to operators and maintenance personnel. Its integrated sound module provides auditory alerts with 13 selectable tones. The device enhances safety and efficiency by providing clear and immediate feedback. It is commonly installed on equipment, panels, or workstations to improve operational awareness. This model is well-suited for manufacturing, packaging, and automation systems.

The weight of the 855T-B24SA1 module typically ranges from 200 to 300 grams. This makes it lightweight and easy to mount on vertical poles, machines, or enclosures. Its design allows stacking without adding significant load to mounting structures. Even with additional modules, the system remains manageable for single-operator installation. Its low weight also reduces mechanical stress on mounting hardware. This is ideal for compact or mobile systems.

Yes, the tone is adjustable with a built-in selector that allows choosing from 13 different sounds. This feature enables users to tailor the sound to the application’s environment and urgency level. For example, continuous tones may indicate critical faults, while pulsing tones can signal status changes. Adjusting tones helps prevent confusion in multi-unit installations. The tone adjustment is quick and intuitive. This improves overall system clarity and response time.

The 855T-B24SA1 has an IP54 rating, which means it is protected against dust and splashing water. This makes it suitable for indoor environments with moderate dust and humidity. While not fully waterproof, it can be used in typical factory floor conditions. For harsher environments, additional protection or higher-rated enclosures may be required. The IP54 rating is common for control panel devices. It ensures dependable operation in standard industrial settings.

No, the Allen-Bradley 855T-B24SA1 was officially discontinued on October 1, 2019. Rockwell Automation no longer offers this sound module as part of its product lineup. Customers are advised to transition to the 856T series, with the 856T-BTR3 serving as the recommended functional replacement. The newer 856T modules offer enhanced performance, modern LED-based signaling, and improved modular compatibility. Migration to the updated product ensures long-term support and component availability. Always consult Rockwell’s documentation when replacing legacy stack light systems.