Technical Data · Publication 855-TD001 · Rockwell Automation
Allen-Bradley Bulletin 855 Signaling Devices — Technical Data
Complete specifications, catalog breakdown, dimensional drawings, mounting accessories, and selection data for the Allen-Bradley Bulletin 855 family of industrial signaling devices: LED light indicators, panel light bars, miniature and industrial beacons, compact control tower stack lights (30 mm / 50 mm / 60 mm / 70 mm), panel-mount sounders and strobes, hazardous-location beacons and horns, and industrial electronic horns. Mirrored from Rockwell Automation Publication 855-TD001P-EN-P.
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Specifications
Stack Light Types
| 30 mm compact tower (855D) | Pre-assembled & pre-wired 1…5 light/sound modules |
|---|---|
| 70 mm compact tower (855F) | Pre-assembled & pre-wired 1…5 light/sound modules |
| 50 mm control tower (855E / 855T) | Modular assembly — light + sound modules stacked on base |
| 40 mm / 60 mm towers (854J / 854K) | Modular control tower stack lights |
| 70 mm modular tower (856T) | Light, sound, power, and IO-Link modules, base mounting adapters |
| Mounting options | Surface, pole-mount (10 cm / 25 cm), threaded-tube, vertical, quick-release, conduit (M20 / ½-in. NPT) |
Light Modules — Electrical
| Operating voltages | 24V AC/DC (±10%), 120V AC 50/60 Hz (±10%), 240V AC 50/60 Hz (±10%) |
|---|---|
| Current consumption (steady or flashing LED) | 20 mA @ 24V AC/DC, 22 mA @ 120V AC, 21 mA @ 240V AC |
| Flashing frequency | Approximately 2 Hz |
| LED module lamp life | 100,000 hours (static, no-vibration conditions) |
| Leakage-current immunity | Up to 3 mA absorbed without module activation |
| Estimated light output (red / amber / green / yellow / blue / white) | 1000 / 800 / 1500 / 700 / 250 / 1000 mcd (steady or flashing) |
Sound Modules — Electrical & Audible
| Sound module voltages | 24V AC/DC, 120V AC, 240V AC |
|---|---|
| Current consumption — piezo (single / dual circuit) | 40 mA @ 24V AC/DC, 22 mA @ 120V AC, 21 mA @ 240V AC |
| Sound module lamp life | 20,000 hours |
| Piezo decibel rating | 85 dBA (+2 / −5 dB) at 1 m (3.3 ft) |
| Panel-mount sounder types | Continuous tone, pulsing tone, dual-circuit piezo sound alarm |
| Industrial electronic horn output (855H) | General and high-performance; recordable and metal-horn variants |
| Hazardous-location horn output (855XH) | 110 dBA or 117 dBA at 1 m, 45 tones, 3 stages, adjustable −8 dB |
Environmental & Mechanical
| Ingress — stack lights | IP65 / UL Type 4/4X/13 |
|---|---|
| Ingress — hazardous-location beacons/horns | UL Type 4/4X/13, IP 66/67 |
| Ingress — miniature square beacons (855B) | UL Type 4/4X/13/3R, IP66 |
| Operating temperature — 30 mm tower | −25…+50 °C (−13…+122 °F) |
| Operating temperature — 70 mm tower | −25…+60 °C (−13…+140 °F) |
| Operating temperature — haz-loc units | −20…+55 °C (−4…+131 °F) (Class I Division 2) |
| Shock / vibration (1-module stack) | 150 G / 2.5 G; derates to 35 G / 2.0 G at 5-module stack |
| Housing / lens material | Polycarbonate (lens, housing); nitrile rubber gaskets; aluminum pole bases |
852C / 852D LED Light Indicators
| Diameter options | 35 mm (852C) or 55 mm (852D) |
|---|---|
| Voltage / color options | 24V DC (3-color RGY) or 10…30V DC (7-color MC) |
| Termination | Integral M12, 5-pin A-coded (QD5) |
| Audible option | Piezo sound (code P), 80–85 dBA, 3400 Hz ±200 Hz |
| Ingress | UL Type 4X, IP 65 / IP 69K (on suitable enclosure) |
| Mounting thread | M22 × 1.5 (852C) or M30 × 1.5 (852D) |
Catalog Number Format
How to read an Allen-Bradley 855 catalog number. Each position encodes a specific configuration attribute.
Position
Meaning
Example
855
Bulletin prefix (Rockwell signaling family)
855D = 30 mm compact control tower stack light
Series letter
Product class — B=miniature beacon, D=30 mm tower, E/T=50 mm tower, F=70 mm compact, H=industrial horn, L=panel light bar, P=panel-mount alarm, R=industrial round beacon, W=wall-mount, XB/XC/XH=hazardous-location
855D / 855F / 855H / 855XH
Base type
Mounting configuration (surface, pole, threaded-tube, vertical, quick-release, conduit)
P00 = surface, P10 = 10 cm pole, T25 = 25 cm threaded tube, Q25 = quick-release 25 cm pole
Cable / connector
SC20 = 2 m (6.6 ft) stranded yellow-jacket cable, Blank = no cable (only with Q10/Q25 quick-release)
SC20
Housing color
B = black, G = gray
B
Voltage
24 = 24V AC/DC, 10 = 120V AC, 20 = 240V AC
24
Module type (per level)
Y = steady LED, L = flashing LED, C = piezo continuous tone, P = piezo pulsing tone, Q = dual-circuit piezo
Y (steady LED on this level)
Lens color / sound code
1 = sound module, 3 = green, 4 = red, 5 = amber, 6 = blue, 7 = clear, 8 = yellow
4 (red)
Communication Protocols
Supported industrial networks and field buses for the products covered by this publication.
IO-Link Available on 856T modular control tower — enables parameterization, color/tone control, and diagnostics over a standard IO-Link master
Hard-wired discrete All other 855 modules — one discrete input per light or sound circuit, 24V AC/DC / 120V AC / 240V AC
Certifications & Compliance
UL 508 Listed
cULus Listed (File No. E14840, Guides NKCR, NKCR7 — stack lights)
cULus Listed (File No. E56639 / E305538 — LED indicators and haz-loc beacons)
CE Marked (EN 61000-6-2, EN 61000-6-3, EN/IEC 60947-1, EN/IEC 60947-5-1, EN IEC 63000)
CSA C22.2 No. 14 / No. 205 / No. 213
UKCA, RCM, KCC (LED indicators)
UL 464 / UL 1638 (miniature square beacons)
ATEX / IECEx for 855XB / 855XC / 855XH hazardous-location beacons and horns
NEC Class I Division 2 Groups A,B,C,D; Class II Division 2 Groups F,G; Class III Division 1 & 2
RoHS compliant
Document Contents
Full PDF covers the following topics in detail:
- Catalog-number breakdown for 852C/852D LED indicators, 855L panel light bars, 855B/BL/BM/BS miniature beacons, 855R industrial round beacons, 855D/855F compact control tower stack lights, 854J/854K modular tower stack lights, 855E/855T 50 mm tower stack lights, and 856T 70 mm modular towers
- Pre-assembled light-module configurations for 1…5 levels with lens color, module type, voltage, and mounting base selection
- Approximate mechanical dimensions (mm/in) for every base, pole, threaded-tube, vertical-mount, conduit-mount, and quick-release configuration
- Mechanical ratings — shock and vibration by stack height (1, 3, 5 modules), ingress ratings (IP65 / UL Type 4/4X/13)
- Environmental specifications — operating and storage temperature per product family
- Electrical specifications — operating voltage, current consumption, inrush current, leakage-current immunity, flashing frequency
- Light output (mcd / cd / lumens) per lens color for each module family
- Sound module specifications — decibel rating at 1 m, frequency, tone selection, piezo vs electronic types
- Panel-mount signaling alarms (855P series): sounders, strobes, combined sounder + LED beacons, dual-circuit alarms
- Hazardous-location beacons, horns, and combination units (855XB / 855XC / 855XH) with ATEX / IECEx / NEC Class-Division and Class-Zone certifications
- Industrial electronic horns (855H): general-purpose, high-performance, recordable, metal, and with attached LED or strobe beacons
- Accessory catalog — vertical mount kits, conduit mount kits, direct mount kits, quick-release locking rings, field-installable M12 4-pin DC terminal chambers (871A-TS4-DM), gaskets, replacement lenses
Frequently Asked Questions
What is the difference between Bulletin 855D and 855F stack lights?
Both are pre-assembled & pre-wired compact control tower stack lights from the same product line, but in different diameters. The 855D is the 30 mm compact tower and the 855F is the 70 mm compact tower. Both support 1…5 modules per stack, the same module-type options (steady LED, flashing LED, piezo continuous, piezo pulsing, dual-circuit piezo), and the same voltage classes (24V AC/DC, 120V AC, 240V AC). The 855F's larger diameter yields higher shock/vibration capability and the 70 mm tower rates to −25…+60 °C operating vs −25…+50 °C on the 30 mm.
How long do the 855 LED light modules last?
Under static, no-vibration conditions (design-life rating) the LED light modules are rated at 100,000 hours. Sound modules are rated at 20,000 hours. Real-world life depends on operating voltage, ambient temperature, and vibration — the spec tables list shock/vibration derating for 1-, 3-, and 5-module stacks.
Can the Bulletin 855 stack lights be used in hazardous locations?
Yes, but only the 855XB (haz-loc beacons), 855XC (combination horn + beacon), and 855XH (haz-loc horns) variants are rated for hazardous areas. These carry ATEX, IECEx, NEC Class/Zone, CEC, and Class/Division certifications for Class I Div 2 (Groups A,B,C,D), Class II Div 2 (Groups F,G), and Class III Div 1 & 2. Standard 855D/F/E/T/J/K compact and modular tower lights are NOT haz-loc rated — they are UL Type 4/4X/13 and IP65 only.
How loud are the 855 sounders and horns?
Piezo sound modules in the stack-light families output 85 dBA (+2 / −5) at 1 m (3.3 ft). Hazardous-location horns (855XH) output 110 or 117 dBA at 1 m with 45 selectable tones in 3 stages and −8 dB adjustable volume. Industrial electronic horns (855H) cover general-purpose and high-performance applications with recordable-tone and metal-horn options for the loudest / harshest installations.
What does the catalog-number suffix tell me about a pre-assembled 855D stack light?
Each level (1…5) of the stack is described by a module-type code + a lens-color/sound code. Y/L/C/P/Q identifies the module type (Y = steady LED, L = flashing LED, C = piezo continuous, P = piezo pulsing, Q = dual-circuit piezo); 1/3/4/5/6/7/8 identifies the lens color (1 = sound module, 3 = green, 4 = red, 5 = amber, 6 = blue, 7 = clear, 8 = yellow). Sound modules (C/P/Q) must sit on the top-most level and be configured with code 1; dual-circuit sound (Q) limits the stack to three light modules.
What mounting options are available for the 855 tower lights?
Surface mount, 10 cm or 25 cm aluminum pole mount with foot, 10 cm or 25 cm M20 metric threaded-tube direct mount, vertical mount (using 855D/F-ABVM bracket), conduit mount (½-in. NPT adapter 855D/F-ACMK), and 10 cm or 25 cm quick-release mount pole (Q10 / Q25) with locking ring (855D-AB/AG-QLR). Accessories include internal gaskets, mounting screw washer kits, and base foot gaskets.
Do the 855 modules support IO-Link?
Yes — IO-Link support lives in the Bulletin 856T 70 mm modular control tower stack-light family. The 856T IO-Link module sits on a base mounting adapter and allows color, flashing pattern, and tone parameterization via an IO-Link master, plus diagnostics. Standard Bulletin 855D/F/E/T stack lights are hard-wired discrete — one input per light or sound circuit, no fieldbus.
What replacement parts and accessories are available?
Vertical mount kits (855D/F-ABVM), conduit mount kits (855D/F-ACMK), direct mount kits (855D/F-ARDM), surface mount kits (855F-ASMK), quick-release locking rings in black or gray (855D-AB/AGQLR), internal gaskets (855D-AQG, five-pack), replacement miniature-square beacon lenses in red/green/amber/blue/clear/yellow (855B-ABLR/ABLG/ABLA/ABLB/ ABLC/ABLY), mounting-screw washer kits (855T-AMSG), base foot gaskets (855D-APFG), and field-installable 4-pin DC M12 terminal chambers (871A-TS4-DM).
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