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856T Control Tower Stack Lights Essential Guide

November 7, 2019 | Video | Automation

Allen-Bradley's 856T Control Tower Stack Light system gives users maximum flexibility in meeting the widest range of applications with a reduced number of components. This system uses a modular design that incorporates brighter LED illumination and a broad offering of sound technologies. All signals in the system operate on 24V AC/DC, powered by 24V AC/DC or 120/240V AC power modules.

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856T 70 mm Beacons (Top Mounted)

Operational voltage: 24V AC/DC
  • Compatible with all the base adaptors and power modules offered in the 856T line
Available functionality:
  • Steady/Flashing (in six colors)
    steady flashing stack lights
  • Strobe beacon (one or two pulses) in Red, Amber or Blue
    strobe beacon stack light
  • Rotating Module with two speeds selectable in Red and Amber
    rotating module tower light
  • RGB LED Multi-color beacon
    • Steady Operating Mode
    • Requires three circuits for full 7 color operation
    • Two circuits to produce Green, Yellow, Blue
    • One circuit will produce Green light only
top mounted stack lights

856T Base Mounting Adaptor

Provides the mechanical means to mount the complete stack light
  • Is the lower portion of the base where the power module is installed and secured
Different mounting styles:
  • Surface mounting with ½ in. NPT internal thread
    • Same footprint as the 855T-BCBC
  • Surface mounting with pre-installed screws
  • Standard aluminum pole mounting
    • 10, 25, 40 and 60 cm pole lengths
  • Vertical mount
  • Threaded tube (10 and 25 cm tube lengths)
All base adaptors in black color housing
stack light mounting styles

856T System selection as separate components

  • 4. Select top sounder or beacon
  • 3. Select light modules or in-line sounders
  • 2. Select the power module
  • 1. Select the base mounting adaptor
stack light system components

856T Light Modules

Steady Light Module
  • White LED’s in color plastic lens
    • Red LED for red Light module
  • Operational voltage 24V AC/DC
  • Offered in seven colors
  • Pre-installed LED PCB
  • Black locking ring at bottom of the module
  • IP66/67 Ingress rating
light stack steady light module
Multi-Function Light Module
  • Steady / Flashing / Strobe / Double Strobe functionality
    • Flashing 2Hz
    • Strobe (1 pulse) 1.4 Hz
    • Strobe (2 pulse) 1.4 Hz
  • Function selected at module via DIP Switch
  • Operational voltage 24V AC/DC
  • Offered in seven colors
light stack multi-function light modules


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