Signal Towers & Stack Lights for Machine Status
Werma signal towers, beacons and machine-integrated lights show machine status at a glance, in modular, ready-configured, IO-Link and cleanroom versions.
Operators can't watch every machine. Without clear visual and audible status, stoppages and faults go unnoticed and output is lost.
Types of signal towers & stack lights
Modular signal towers
Build the tower from individual light and sound elements and add to it at any time.
Models: KombiSIGN 40 · KombiSIGN 71 · KombiSIGN 72
Compact ready-configured towers
Pre-assembled 2–5 tier towers with 360° visibility and optional buzzer (up to 90 dB on the RST 56).
Models: KOMPAKT37 · RST Series · RST 56 · CST Series · CST55
IO-Link signal towers
Colours and segments controlled over one IO-Link cable; UV- and weather-resistant (UL Type 4X).
Models: eSIGN (9 and 15 segments)
Cleanroom
Signal towers suited to cleanroom use in pharma and electronics.
Models: CleanSIGN · eSIGN (Air Cleanliness Class 2)
Beacons & machine-integrated lights
Compact LED beacons and lights built into the machine, with optional buzzer and M12 connection.
Models: MC35 beacons · D-Series · Machine integrated light
What to specify
| Parameter | What to check |
|---|---|
| Tiers & colours | Typically red, yellow and green; add blue or white for operator calls or extra states. |
| Visibility | 360° visibility and brightness to suit the hall size and viewing distance. |
| Audible alarm | Add a buzzer or siren where operators aren't always looking at the machine. |
| Control | Discrete wiring per colour, or IO-Link (eSIGN) for one cable and colour control from the PLC. |
| Environment & mounting | UV/outdoor, washdown or cleanroom requirements; base, tube or bracket mounting; M12 or cable connection. |
18 models in our range
Signal towers 14
Werma CleanSIGN
CleanSIGN WM Contin. tone 24VDC GN/YE/RD · Continuous light in red, yellow and green.…
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CST Series
Signal alarms for errors · Electronic Assembly…
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Werma CST55
Signal alarms for errors · Electronic Assembly…
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eSIGN 15 segments
eSIGN IO-Link 15 Segments with Siren BK · Visibility, individuality and efficiency.…
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eSIGN 9 segments
eSIGN IO-Link 9 Segments with Siren BK · Fulfills Air Cleanliness Class 2 for Cleanroom applications in accordance with DIN EN ISO 14644-1.…
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eSIGN Series
Resistant to UV radiation and environmental influences (UL Type 4X) · 2 sizes, with/without siren, 24 V supply/versions with IO-Link technology…
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KombiSIGN / Stackable
KombiSIGN 71 : · Different light effects are possible for individual signalling…
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Werma KombiSIGN40
High-runner product under one item number · Variant reduction…
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Werma KombiSIGN72
KS72 Design BWM 24VAC/DC GN/YE/RD · KS72 Classic RM 24VAC/DC GN/YE/RD…
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Werma KOMPAKT37
K37 plug EM 24VAC/DC GN/YE/RD · LED permanent light With M12 connector…
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LED Perm light element 24VAC or DC BU
The use of LEDs enables a service life of up to 100,000 hours · Four LEDs produce a very bright light spot…
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Machine integrated light
Optimum visibility · Reliably signals hazards or critical machine states…
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RST 56
Modern & robust industrial design · 2 to 5 tiers…
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RST Series
Advanced industrial aesthetics design · Soft light for eye protection…
View Details →Beacons 4
C MC35 Beacon 24V RGY M12
Compact LED recessed light with continuous light and an attention- grabbing buzzer (80 dB) with 35 mm diameter. · The tricolour version combines the most common colour combination red, yellow and green in one signalling device.…
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Werma D-Series
Base mounting (Standard fittings) · Base mounting with cable gland…
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G MC35 UL Beacon 10 to 30V RGB M1
Compact LED recessed luminaire with continuous light and 35 mm diameter. · The multicolour version offers up to seven colours in one luminaire: red, yellow, green, white, blue, violet and turquoise.…
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MC - Multi colour
Compact LED recessed luminaire with continuous light and 35 mm · Control is via a pre-assembled M12 connector.…
View Details →Where they're used
Machine status
Running, warning and fault status visible across the shop floor.
Andon on assembly lines
Operator calls for help, material or quality.
CNC & machine tools
Cycle end and alarm signalling.
Cleanrooms & pharma
Cleanroom-suitable signalling.
Logistics & material call
Signal stations at workstations and docks.
Common questions
What do the colours on a stack light mean?
Under IEC 60204-1 (safety of machinery: indicator lights), red means emergency or hazardous condition, yellow abnormal condition, green normal condition, blue a mandatory operator action, and white has no specific meaning and can be used for other states. Many plants simplify this to red = fault, yellow = warning, green = running.
Modular or ready-configured signal tower?
Modular towers (KombiSIGN) let you choose and change each element, and add more later. Ready-configured towers (KOMPAKT37, RST, CST) come pre-assembled under one part number, simpler to order and stock.
What is the advantage of an IO-Link signal tower?
One standard cable instead of a wire per colour. The PLC sets colours, segments and effects, so the same tower can show more states and be changed in software.
Can I add a buzzer?
Yes. many towers and beacons are available with an integrated buzzer or siren; the RST 56 buzzer reaches up to 90 dB.
Do you have signal towers for cleanrooms?
Yes. Werma CleanSIGN, and eSIGN, which fulfils Air Cleanliness Class 2 for cleanroom applications.
- Established
- 1994
- Quality system
- ISO 9001:2015
- Offices
- 8 across India
- Support
- In-house application engineers
Planning machine or andon signalling?
Tell us the number of states, the environment and how you'll control the lights. We'll recommend the right tower and configuration.