855T-B24GL3
Aktivní855T Control Tower Light Green/Red/Yellow
Allen-Bradley 855T modular stack light — green, red, yellow segments.
Běžné aplikace
Stack light (tower light / andon light) that mounts on top of a machine or panel. Green/red/yellow segments visible from across the factory floor. More visible than panel-mount indicators. Used for machine status, production rate, and quality alerts in lean manufacturing. The segments are modular — add/remove colors as needed.
Research Notes
1. Overview
The Allen-Bradley (Rockwell) 855T-B24GL3 is a Control Tower® 70mm stack light — a modular signaling tower used to show machine/process status at a glance. The 855T platform is fully modular: a base + stackable illuminated color segments (and optional sounder) assemble to the needed configuration; this pre-configured unit runs on 24V AC/DC with LED illumination. It is a signaling/indicator device, not a pushbutton — no operator contact. Mounts via ½" NPT pipe/pole or direct panel base.
2. User Sentiment
Control Tower is a long-standing industry-standard tower-light line; integrators value the robust modular stacking, LED longevity, and broad Rockwell ecosystem support. The usual selection care is decoding the 855T catalog string (base type, voltage, illumination type, number/order of color modules) and matching mount + voltage — the model number is a build code, so confirming the exact color stack against Rockwell's configurator is worthwhile.
3. Real-World Applications
Machine and line status indication (run/idle/fault), andon signaling, and process alerts on factory equipment, conveyors, and automation cells — visible across a plant floor. Often paired with an audible module for alarms.
4. Technical Specifications
- Type: 70mm modular Control Tower stack/tower light (LED); signaling device, not a button
- Voltage: 24V AC/DC
- Illumination: LED color segments (green/red/yellow and others in the 855T range; this SKU's exact color stack per Rockwell's build code — verify on the configurator)
- Mounting: ½" NPT pipe/pole mount or direct panel base
- Approvals: UL, CSA, CE
- Series: Allen-Bradley 855T Control Tower
5. Ordering & Compatibility
855T is a modular family — order the base, color modules, and optional sounder per need, or a pre-assembled unit like this one. Colors/segments and mount stack within the 855T system; confirm the exact configuration from the catalog number via Rockwell's product configurator. Sold through Rockwell/Allen-Bradley distributors.
6. Known Issues
No notable reliability issues — mature LED tower-light line. Main gotcha is catalog decoding: the model string encodes base/voltage/illumination/colors, so verify the exact color order + count and voltage before ordering; it is a status indicator, not an operator control.
2 sources
- 855T-B24GL3 — 70mm Stack Lights (Control Tower) — rockwellautomation.com
- 855T Control Tower Stack Lights (family) — rockwellautomation.com
Specifikace
|
Certifications
Third-party safety certifications. UL = required for US NEC installations. CE = EU compliance. CSA = Canadian standards.
|
UL, CSA, CE
|
|
Color
Button/actuator color. Green = start/go, Red = stop/emergency, Yellow = caution, Blue = reset (per IEC 60204-1).
|
Green/Red/Yellow (modular)
|
|
Mounting Type
How the button attaches to the panel. Panel mount is standard — installs through a cutout from the front.
|
1/2 NPT pipe mount or direct panel
|
|
Voltage
|
24V AC/DC
|
Stručný průvodce instalací
Panel cutout: 22mm. Insert from the front, secure with mounting nut.
LED module: Check the voltage rating matches your supply (typically 24V DC or 230V AC). Connect to PLC digital output or relay contact for status indication.
Color meaning (IEC 60204-1): Green = normal/running. Red = fault/danger. Yellow = warning/caution. Blue = mandatory action. White = neutral/general.
Rozměry
Řešení problémů
Light is dim or flickering
Check supply voltage matches the LED module rating. Low voltage causes dimming. If voltage is correct, the LED module is failing — replace it. LED modules have finite life (typically 50K-100K hours).
Light doesn't turn on
Verify voltage at the terminals with a multimeter. Check the PLC output or relay driving the light. LED modules are polarity-sensitive on DC circuits — try reversing the leads.
Kde koupit
Cenové rozpětí
$4.71 — $125.87
u 2 distributorů
Stručné specifikace
- Certifications
- UL, CSA, CE
- Color
- Green/Red/Yellow (modular)
- Mounting Type
- 1/2 NPT pipe mount or direct panel
- Voltage
- 24V AC/DC
Co říkají uživatelé
“Stack light (tower light / andon light) that mounts on top of a machine or panel. Green/red/yellow segments visible from across the factory floor. More visible than panel-mount indicators. Used for ma”