Sitraffic One: The world's first 1Watt Technology
Economical. Safe. Innovative.
The most energy-efficient intersection of all times: Sitraffic One with two global firsts...
Global firsts and key benefits
For budget managers in municipal transport departments, saving energy is paramount while maintaining the highest safety standards. Sitraffic® One is the world's first solution to meet both requirements, consisting of a complete suite of 1-Watt devices designed according to the strict SIL3 safety standard.
Global first #1: Save 1,600 kWh of power and 960 kg of CO₂ – per intersection and year
The Silux2 VLP signal head, known as "Very Low Power," lives up to its name. This innovative signal head consumes no more than 1–2 Watts per aspect, making it the most energy-efficient solution on the market. It offers energy savings of 80% compared to standard LED technology. At an average intersection, Sitraffic One reduces annual power consumption by approximately 1,600 kWh and CO₂ emissions by 960 kg. Conversion to 1Watt Technology from Siemens could cut annual energy costs for a city like Berlin by over €500,000 per year.
Global first #2: Controllers AND signal heads certified to SIL3 safety standard
The 1Watt Silux2 VLP signal head features both conventional voltage and current monitoring, plus a novel optical monitoring function, achieving the highest safety level for traffic control equipment: SIL3. An independent test institute has certified full conformity with the SIL3 standard. Sitraffic One is the first system globally to include both controllers and signal heads designed according to the strict SIL3 requirements set down in EN 61508.
Extremely low power consumption combined with high safety standards represents a significant innovative leap, contributing to higher road safety and providing greater financial scope for responsible municipal authorities.
Sitraffic One in a nutshell
- Economical: Extremely low power consumption of only 1–2 Watts per signal head aspect with the new Silux2 VLP signal head and standard cabling.
- Safe: Full SIL3 conformity for both controller and signal head, thanks to the innovative optical monitoring function integrated in the signal head.
- Robust: The decoupling of the signal head's 24 V DC power supply from the controller's mains supply makes system operation more immune to mains fluctuations.
- Innovative: Digital LED components and two embedded microprocessors collect operational data, enabling future functions like reliable prediction of LED failure.
- System compatible: Compatible with Sitraffic sX-V and Sitraffic C920ES controllers, as well as with standard intersection designs and cables (e.g., 1.5 mm²).
- Complete set, including peripherals: Developed with renowned manufacturers RTB, Langmatz, and Urich, offering peripherals like push buttons and acoustic signals for the blind, designed specifically for the new 1Watt Technology.
Sitraffic One: The world's first traffic light system in 1Watt Technology
This section describes a typical intersection setup:
- 1 Sitraffic C920ES controller in 1Watt Technology
- 2 Sitraffic sX-V controller in 1Watt Technology
- 3 Silux2 VLP signal head in 1Watt Technology
- 4 Push buttons and acoustic signals for 1Watt Technology
System integration at its best: 1Watt Technology plus proven Silux2 features
Sitraffic One: 1Watt Technology for the entire intersection
The innovative 1Watt Technology is part of the world's most successful traffic engineering platform: Sitraffic. Sitraffic One devices offer the well-known advantages of the Sitraffic family, including ease of use and seamless integration into existing traffic control infrastructure. The new very-low-power signal heads, Silux2 VLP, share these advantages.
Sitraffic One is a complete intersection solution comprising signal heads, controllers, and peripherals based on 1Watt Technology. The new Silux2 VLP signal head is compatible with both the Sitraffic sX-V and the Sitraffic C920ES controllers. Siemens has collaborated with manufacturers like RTB, Langmatz, and Urich to provide fully compatible peripherals, including push buttons and acoustic signals for the blind.
Special design for added protection against mains fluctuations
With increasing reliance on renewable energy sources, mains fluctuations are becoming more frequent. Sitraffic One's 1Watt Technology decouples the signal head power supply from the controller's mains supply. The 1Watt power supply module handles strong fluctuations, providing a stable 24-V DC supply to the signal head, enhancing system robustness, monitoring ease, safety, and availability.
The new Silux2 VLP signal head: durable, compatible, available as retrofit
The new 1Watt Technology signal heads are available as retrofit kits or in Ecolight and Classic housings. They feature reliable driver modules and durable components, ensuring exceptionally stable operation and an extended service life. The LED light sources produce minimal heat, eliminating the need for cooling elements. The extremely low power consumption (1–2 Watt per aspect) enables cost-efficient use of central DC power supply units.
... and with the ease of handling typical of Silux2
Similar to other Silux2 LED signal heads, Silux2 VLP can be equipped with various removable symbol inserts. These masks are easily fitted inside the detachable front lens. Non-standard symbols are available upon request. Replacing or rotating inserts is simple, thanks to an integrated door with an easy-to-open bayonet lock.
Visual Description: An image shows a traffic light with red, amber, and green signals, alongside a controller box. Text indicates: "Signal heads, traffic controllers and peripherals in 1Watt Technology - that is Sitraffic One".
Silux2 VLP signal head: dual-channel optical monitoring function for highest SIL3 safety level
In addition to conventional monitoring, the Silux2 VLP is equipped with an LED monitoring function using an integrated photo detector. This detector measures incident light intensity and other LED parameters, passing data to the LED electronics board. This capability will enable prediction of potential LED failures in the future.
Optical monitoring function
Description of diagram: The optical monitoring function uses a cover to keep out extraneous light. LED light reaches sensor optics, which deflect the signal light to a photo detector. The photo detector measures incident light and sends information to the LED electronics board.
Components shown in diagram: Photo detector, Sensor optics, Cover, LED.
Siemens components for 1Watt intersections: SIL3 signal heads and controllers
Shared technical data – Sitraffic C920ES and Sitraffic sX-V controllers
| Category | Details |
|---|---|
| Legislation, standards, directives |
|
| Lamp switch types | VDE 24 V (LSVS) LED 1–3 W |
| Lamp types/signal head types |
|
| Technical data of lamp switching module |
|
| Max. power per lamp output | Max. 12 W (4 × 3 W) with 24 V technology |
| Signal head cabling |
|
| Detectors, inputs/outputs |
|
| Signal monitoring |
|
Peripherals for 1Watt Technology
Push buttons
- RTB: Type A, B, C, D, E, F, G, H, I
- Langmatz: Type EK533 + (crossguide)
- Urich: Type AS
Acoustic signals for the blind
- RTB: Type Kombi-S
Model-specific technical data – Sitraffic C920ES and Sitraffic sX-V controllers
| Feature | Sitraffic C920ES | Sitraffic sX-V |
|---|---|---|
| Mains supply voltage | 230 V AC (–20 % / +15 %) | 230 V AC (–20 % / +15 %) 117 V AC (–20 % / +15 %) for export |
| Signal groups | Up to 48 signal groups per partial intersection | Up to 64 signal groups per partial intersection |
| Partial node | Maximum of 4 partial nodes | No partial nodes = 1 overall node |
| Processor | 32-Bit Motorola Power-PC MPC8270/266 MHz/88 MB, can be expanded using IDE Flash cards | OMC: CPU with 32-bit x86 processor Vortex86D (Intel-based)/800 MHz/512 MB DRAM, Compact Flash card 1 GB |
| Operator control/data supply |
|
|
| Control centers |
|
|
| PC tools | User-oriented service software, downward-compatible so it can also be used for C800:
|
|
| Web user interface | Data supply and modification for main parameters and establishment of connection to control center |
|
| Traffic-actuated control |
|
|
Technical data – Silux2 VLP signal heads
| Property | 200 mm | 300 mm | |
|---|---|---|---|
| Optical properties in conformity with DIN EN 12368 | |||
| Luminous intensity distribution | A2/1, B2/2 | A3/1, B3/2 | |
| Axial luminous intensity – typical value | > 200 cd | > 400 cd | |
| Dimmable | no | no | |
| Radiation characteristics | W | N | |
| Uniformity of luminance | > 1:10 | > 1:15 | |
| Color coordinates according to DIN EN 12368 | red amber green | 613–631 nm 585–597 nm 489–508 nm | 613–631 nm 585–597 nm 489–508 nm |
| Symbol class | S1 | S1 | |
| Electrical and mechanical properties | |||
| Operating voltage | 24 V DC | ||
| Power consumption | 1–2 W per aspect | ||
| Power factor | > 0.9 | ||
| EMC | according to EN 50293 | ||
| Lenses | system-specific colored or neutral lenses | ||
| Standard versions of symbols | as symbol masks | ||
| Protection class of LED insert | IP65 | ||
| Resistance to mechanical impact | IR3 | ||
| Operating temperature | –40 °C to +60 °C | ||
| Relative humidity | 20 % to 95 % | ||
| Housing colors | black RAL 9005, fir green RAL 6009, pebble gray RAL 7032 | ||
| Compatibility with controllers | |||
| Controllers | Sitraffic C920ES, Sitraffic sX-V | ||
Sitraffic One: Components for 1Watt intersections
Sitraffic C920ES traffic controller
Part of the C900 range, the C920ES has been equipped with a signal monitoring function for optimum use with 1Watt Technology. It combines high performance, maximum operational reliability and fail-safety with ease of adaptation to any new requirements.
Sitraffic sX-V traffic controller
The new, Web-enabled traffic controller can be operated via a PC, tablet or smartphone and expanded at any time to match the growth of the city's traffic infrastructure.
Silux2 VLP signal head
The new, digital 1Watt Technology signal head is certified according to the strict SIL3 safety standard. With redesigned optics and electronics, it is available with a signal diameter of 200 or 300 mm for installation in Ecolight and Classic housings or as retrofit kit.
Certification: SIL3 certified as per EN 61508
