856T-BT8

Overview of Allen Bradley 856T-BT8

The Allen Bradley 856T-BT8 is a 70 mm stack light module designed for industrial signaling and visual indication in demanding manufacturing environments. Part of the 856T Control Tower series from Rockwell Automation, this light module features a steady LED with a yellow polycarbonate lens and operates on 24V AC/DC power. The unit provides reliable, bright illumination to communicate machine status, production alerts, or safety conditions on the factory floor. Built with a modular design, this one-circuit module integrates seamlessly into custom stack light configurations, allowing engineers to build tailored signaling towers for specific application needs. The 856T-BT8 carries an IP66/IP67 ingress protection rating, ensuring durability against dust and water ingress in harsh industrial conditions. The LED technology delivers energy-efficient operation with extended service life compared to incandescent alternatives, reducing maintenance requirements and downtime. The black housing provides a professional appearance while the yellow lens offers high visibility for caution or warning states. This light module is fully compatible with other 856T series components including power modules, base adapters, and additional light or sound modules.

Key Features of Allen Bradley 856T-BT8

• Steady LED Technology: Energy-efficient LED provides consistent, bright illumination with long operational life
• 24V AC/DC Operation: Single voltage rating simplifies power supply selection and system design
• IP66/IP67 Protection: Sealed enclosure resists dust, moisture, and washdown conditions
• Yellow Polycarbonate Lens: High-visibility color for cautionary signals with impact-resistant material
• Modular Design: Compatible with all 856T Control Tower components for custom configurations
• One-Circuit Module: Dedicated single-channel control for straightforward wiring and operation

Technical Specs of 856T-BT8

Manufacturer Part Number	856T-BT8
Bulletin	856T
Type	Light Module
Size	70 mm
Lamp Type	LED
Lamp Action	Steady
Lens Color	Yellow
Lens Material	Polycarbonate
Housing Color	Black
Voltage Rating	24V AC/DC
Number of Circuits	One Circuit Module
Enclosure Rating	IP66/IP67
Country of Origin	Austria
Standards Compliance	UL 60947-5-1, CSA C22.2 No. 14, CE, c-UL-us, RCM, KCC

Applications / Use Case

The Allen Bradley 856T-BT8 light module serves critical signaling functions across automated production lines, machine tools, packaging equipment, and material handling systems. Yellow indication typically signals caution, warning, or intermediate states such as machine warm-up, cycle pauses, or maintenance requests. Manufacturing facilities deploy these modules on CNC machines to indicate tool change requirements, on conveyor systems to show queue status, and on assembly stations to communicate operator intervention needs. The 24V AC/DC compatibility makes this module suitable for integration with PLC outputs, relay logic, and modern industrial control networks. Process industries use these stack lights for batch status monitoring, while automotive assembly plants employ them for line-side quality alerts. The IP66/IP67 rating allows installation in food processing areas subject to washdown, pharmaceutical cleanrooms, and outdoor material yards exposed to weather. Maintenance teams benefit from the LED reliability, which reduces bulb replacement frequency and associated downtime. The modular architecture allows facilities to standardize on the 856T platform while customizing individual towers to match specific machine requirements, creating consistent visual language across diverse production equipment.

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